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CBSE Questions for Class 12 Medical Biology Biodiversity And Its Conservation Quiz 7 - MCQExams.com
CBSE
Class 12 Medical Biology
Biodiversity And Its Conservation
Quiz 7
Wild buffalo is an endangered species because
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Its population diminishing
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It has become extinct
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It is found exclusively in a particular area
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Its poaching is strictly prohibited
Explanation
An endangered species is a native species that faces a significant risk of extinction in the near future throughout all or a significant portion of its range.
The presence of diversity at the junction of territories of two different habitats is known as
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Bottle neck effect
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Edge effect
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Junction effect
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Pasteur effect
Explanation
The increase in biodiversity at the junction of two different habitats is known as edge effect. This is termed as ecotone, not as Pasteur effect.
The presence of diversity at the junction of territories to two different habitats is known as
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Bottleneck effect
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Edge effect
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Junction effect
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Pasteur effect
Explanation
$$\textbf{Correct option:}$$ $$\textbf{(B)}$$
$$\textbf{Solution:}$$
$$\textbf{Option (A)}$$
$$\bullet$$ Even if organisms do not move from one location to another, their populations may be substantially diminished from time to time.
$$\bullet$$
This could happen as a result of flooding, drought, or any other environmental change.
$$\bullet$$
The few individuals who have survived may represent a random genetic sample of the original population.
$$\bullet$$
The bottleneck effect refers to the alterations and loss of genetic variety that emerge as a result of these changes.
$$\textbf{Option (B)}$$
$$\bullet$$Changes in population or community structures that occur along the border of two environments are referred to as edge effects.
$$\bullet$$
The boundary habitat allows for more biodiversity as the edge effects rise.
$$\textbf{Option (C)}$$
$$\bullet$$ Cell junctions are multiprotein complexes that make up cellular structures.
$$\bullet$$
Adhesion between adjacent cells is provided by them.
$$\bullet$$
They are establishing communication links between cells in close proximity.
$$\textbf{Option (D)}$$
$$\bullet$$ The pasteur effect is the suppression of glycolysis by oxygen in an aerobic state.
$$\bullet$$
The inhibition of the enzyme phosphofructokinase causes the Pasteur effect.
$$\bullet$$
In the presence of oxygen, the pasteur effect causes glycolysis to slow down.
$$\textbf{Thus the Correct option is (B)}$$
Which one of these is not concerned with wildlife conservation?
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IVF
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IUCN
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WWF
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IBWL
Animal protected in Kaziranga national park is
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Tiger
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Lion
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Elephant
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Rhinoceros
Explanation
Kaziranga National Park is a national park in the Golaghat and Nagaon districts of the state of Assam, India. The sanctuary hosts two-thirds of the world's great one-horned rhinoceroses is a World Heritage Site.
According to the census held in March 2015,
the rhino population in Kaziranga National Park is 2,401.
Therefore, the correct answer is option D.
Select the incorrect statement.
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Stellars sea cow and passenger pigeon got extinct due to over exploitation by men
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The convention on biological diversity was held in 1992
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Species diversity increase as we move away from the equator towards the poles
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Lantana and Eichhomia are invasive weed species in India
Explanation
$$\textbf{Correct option:}$$ $$\textbf{(C)}$$
$$\textbf{Solution:}$$
$$\textbf{Expalnation for Correct statement}$$
$$\textbf{Option (A)}$$
$$\bullet$$ Human overexploitation has resulted in the extinction of Stellar's sea cow and passenger pigeon.
$$\bullet$$
People, for example, ate a lot of passenger pigeons, but they were also slaughtered because they were considered a threat to agriculture.
$$\textbf{Option (B)}$$
$$\bullet$$ In 1992, the landmark 'Convention on Biological Diversity,' a worldwide gathering, took place.
$$\bullet$$
The Convention on Biological Diversity (CBD) is a legally binding international convention with three basic objectives:
$$\textbf{1.}$$ Biodiversity preservation
$$\textbf{2.}$$
conservation and usage
$$\textbf{3.}$$ T
he equal and fair distribution of the benefits derived from the exploitation of genetic resources
$$\textbf{Option (D)}$$
$$\bullet$$
In India, invasive weeds such as Lantana and Eicchornia are common.
$$\bullet$$
These weeds enter natural environments that have been altered, posing a threat to biodiversity.
$$\bullet$$
The weed can be found all over India.
$$\textbf{Expalnation for Incorrect statement}$$
$$\textbf{Option (C)}$$
$$\bullet$$
The temperature drops as we move further from the equator and closer to the poles.
$$\bullet$$
In addition, the environment becomes more hostile, vegetation diminishes, and there are less resources available to sustain life.
$$\textbf{Thus the Correct option is (C)}$$
Which of the following feature is incorrect for a wildlife sanctuary?
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It is an artificially created and protected area for animals.
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It is a protected area for threatened and endangered wild animals.
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It is meant for conservation of only plant species.
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Capturing and poaching of animals is strictly prohibited here.
Explanation
Wildlife sanctuary is a reserved area of land, owned by the government or private agency for the protection of particular species of animals during part or all of the year. This area is designated for the protection of wild animals, within which hunting and fishing is either prohibited or strictly controlled.
Largest tiger population is found in
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Sunderban national park
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Corbett national park
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Ranthambhor national park
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Kanha national park
Explanation
The Sundarban national park is a national park, tiger reserve, and biosphere reserve in West Bengal, India. It contains the world's largest area of mangrove forests. The Sundarbans support a wealth of animal species including the single largest population of tiger and a number of other threatened aquatic mammals such as the Irrawaddy and Ganges River dolphins
So, the correct answer is option A.
All the following are included under in-situ conservation except?
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Botanical garden
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Biosphere reserve
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National park
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Wildlife sanctuary
Explanation
Ex-situ conservation means off-site conservation. It is the process of protecting an endangered species of plant or animal outside of its natural habitat by removing part of the population from a threatened habitat and placing it in a new location, which may be a wild area or within the care of humans. Botanical gardens are ex situ conservation.
Thus the correct answer is option A.
The Wildlife Protection Act was introduced in
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1972
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1981
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1986
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1991
Explanation
The Wildlife Protection Act, 1972 is an Act enacted for protection of plants and animal species.
Which one of the following is a correct combination of two biodiversity hot spots in India?
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Eastern Himalayas and Eastern ghats
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Eastern Himalayas and Western ghats
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Western ghats and Eastern ghats
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West coast and Western ghats
Explanation
To qualify as a hotspot, the region must meet two requirements:
it must contain at least 1500 species of vascular plants as endemics.
It has to have at least lost 75% of its original habitat.
So, in India, such hotspots are Eastern HImalayas, Western ghats and Sundalands.
Thus, the correct answer is option (B).
Which of the following species is restricted to a specific area?
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Sibling species
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Allopatric species
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Sympatric species
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Endemic species
Explanation
An endemic species is one whose habitat is restricted to a particular area. The term could refer to an animal, a plant, a fungus, or even a microorganism. The definition differs from “indigenous,” or “native,” species in that the latter, although it occurs naturally in an area, is also found in other areas. Endemic species are often endangered, and particular examples may become a focus point for campaigns to protect biodiversity in a given environment
So, the correct answer is '
Endemic species'
Which one of the following is not included under in-situ conservation?
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National park
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Wild life sanctuary
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Zoological garden
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Biosphere reserve
Explanation
Zoological gardens
are the means of
ex-situ
conservation.
It is the process of protecting an endangered species of plant or animal outside of its natural habitat
.
In-
situ
conservation involves the conservation of genetic resources through their maintenance within natural or even human-made ecosystems in which they occur. It includes n
ational parks, sanctuaries, biosphere reserves, nature reserves, natural monuments, cultural landscapes, etc. Hence, the correct answer is option C.
How does the genetic diversity of a modern corn field compare to the genetic diversity of a population of the pre-domesticated corn plant?
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Less diversity
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More diversity
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More genetic diversity, but less phenotypic variation
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The same amount of diversity
Explanation
The genetic diversity of a modern corn field is more diverse as it may contain genes transferred from from bacteria, to naturally protect it from pests
For example, Bt corn
However, a pre domesticated corn plant is the one that is most suitable to be grown in a certain environment, majorly by artificial selection that is cross breeding and deriving a gene pool from an existing one that can provide a better commercial value
Example - sweet corn, a recessive trait, but is abundantly available due to taste preference and comparatively soft kernels
Which of these activities help to maintain biodiversity?
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(i) and (ii) only
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(i) and (iii) only
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(ii) and (iii) only
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(i), (ii) and (iii)
Explanation
Biodiversity is the variety of organisms which include plants, animals, and microbes in a particular habitat. There is the loss of biodiversity due to the interference by the humans. The measures taken for maintaining the biodiversity is to protect the endangered species to prevent them from getting extinct. The forest reserves need to set up by the programs of reforestation and afforestation.
Thus, the correct answer is option A.
Which of these activities help to maintain biodiversity?
I - Protect endangered species
II - Set up forest reserves
III - Clear land for agriculture
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l and II only
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I and III only
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II and III only
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I, II and Ill
Explanation
Biodiversity is the variety of organisms which include plants, animals, and microbes in a particular habitat. There is the loss of biodiversity due to the interference by the humans. The measures taken for maintaining the biodiversity is to protect the endangered species to prevent them from getting extinct. The forest reserves need to set up by the programs of reforestation and afforestation.
Thus, the correct answer is option A.
All of these are reasons why biodiversity is important except
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It allows for adjustment to disturbances.
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It cleans water.
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It provides food and materials.
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It has led to medical discoveries.
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It increases extinction rates.
Explanation
A. Biodiversity allows for adjustments to various disturbances. For example, trees control the rainfall.
B. As the polluted water flows through the dense areas having plants, it gets cleaned naturally.
C. Biodiversity provides food both for animals and mankind.
D. Biodiversity has to medical discoveries as various medicinal plants have been discovered.
E. Biodiversity reduces the extinction rates.
Hence statement E is incorrect.
So, the correct answer is '
It increases extinction rates'.
Beta $$(\beta)$$ diversity refers to diversity
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Within a community
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Between communities
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Between two eco zones
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Within a population
Explanation
$$\textbf {Correct Option (B):} $$
$$\textbf {Solution:} $$
$$\textbf {Option (A):} $$
$$\bullet$$ Diversity in a single community is referred to as gamma diversity.
$$\textbf {Option (B):} $$
$$\bullet$$
β
diversity is said to be the difference in diversity of species from one community to the other. For example, America might have an Indian population who are born there and lived there all their life and similarly India might have Americans that were born and brought up here.
$$\textbf {Option (C):} $$
$$\bullet$$
$$\textbf {Option (D):} $$
$$\bullet$$ Diversity in a certain population is attributed as genetic variation.
Hence, the option(B) is the correct answer.
All of these are human activities that threaten biodiversity except
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The release of excess nitrates from agricultural runoff
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Over-harvesting of plants and animals
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Overuse of herbicides
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Habitat preservation
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Excessive ultraviolet radiation from a depleted ozone layers
Explanation
A. Various fertilizers are used in agriculture which contain nitrogen as a key component. Runoff from agricultural land causes the release of excess nitrates.
B. Over harvesting of plants and animals for profit by the mankind has resulted into extinction of various species.
C. Overuse of herbicides kills the soil microflora and other microorganisms also.
D. Habitat preservation is not a threat to biodiversity as it will save the species.
E. Ozone has depleted due to various human activities like CFCs and due to this, excess ultraviolet rays can reach the earth and cause various problems to biodiversity.
Hence statement C is incorrect.
So, the correct answer is 'Habitat preservation'.
Threatened and endangered species are being protected in which of the following ways?
I. Captive breeding
II. Wildlife refuges
III. Laws and regulations
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I and III only
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II only
0%
III only
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II and III only
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I, II and III
Explanation
I. Captive breeding is the protection of plants and animal species in a controlled environment. For example, botanical gardens, wildlife reserves etc.
II. Wildlife refuges are the name or designation given to certain protected areas of plants and animal species.
III. Laws and regulations are the rules that are implemented to protect species of plants and animals.
Hence, threatened and endangered species are being protected in captive breeding and laws are made to protect them.
So, the correct answer is 'I and III only'.
Which is accepted by researchers as a level of biodiversity?
I. Species biodiversity
II. Genetic biodiversity
III. Ecosystem biodiversity
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I only
0%
II onIy
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I and II only
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II and III only
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I, II and III
Explanation
Researchers have accepted three levels of biodiversity, namely genetic biodiversity, species
biodiversity,
and ecosystem
biodiversity
. All three levels are interrelated.
Genetic diversity includes variety at the level of genes. It is measured at various levels like population, species, community, and biome.
Species diversity includes variety in the species. It is the easiest method of studying diversity. Each species has a particular role in the ecosystem.
Ecosystem diversity includes diversity that deals with species distribution, community patterns, the role of key species and species interactions.
Thus, the correct answer is option E.
Given below is the representation of the extent of global diversity of vertebrates. What groups does the portions represent?
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A - Mammals, B - Birds, C - Fishes, D - Amphibians, E - Reptiles
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A - Fishes, B - Mammals, C - Birds, D - Reptiles, E - Amphibians
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A - Birds, B - Reptiles, C - Fishes, D - Mammals, E - Amphibians
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A - Fishes, B - Amphibians, C - Mammals, D - Birds, E - Reptiles
Explanation
The change in the gene pool due to the process of mutation and recombination may lead to a change in the diverse range of vertebrates. The external factors like temperature, food availability may bring certain adaptational changes which may also contribute to global diversity. According to the given pie chart, fishes has maximum global diversity followed by mammals, birds reptiles and amphibians.
So, the correct answer is option B.
Biodiversity is being conserved in a variety of ways. Which of these is a way in which biodiversity is currently being conserved?
I. Preserving habitats
II. Introducing non-native species
III. Protecting populations
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I only
0%
II only
0%
II and III only
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I and III only
0%
I, II and III
Explanation
I. Preserving habitats is the protection of natural habitats of species.
II. Introducing non-native species can be harmful as they compete with the native species for resources.
III. Protecting populations is not the protection of biodiversity. Instead, it includes the protection of resources essential for the survival of the population.
Hence, biodiversity is being conserved by preserving habitats.
So, the correct answer is 'I only'.
One of the following statements is incorrect with reference to biodiversity. Identify it.
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Biodiversity increases from higher altitudes to lower altitudes.
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Depletion in genetic diversity of crop plants is mainly due to the introduction of better varieties with high yield, disease resistance, etc.
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The richest reservoirs of animal and plant life (species richness) with few or no threatened species are called "biodiversity hotspots".
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Biodiversity decreases from the equator to polar regions.
Explanation
Biodiversity hotspots are areas which are rich in aminal or plant species or high degree of biodiversity.
They are determined by mainly three factors:
(i) A number of species/species diversity.
(ii) The degree of endemism.
(iii) The degree of the threat to habitat due to its degradation and fragmentation.
Thus, the correct answer is option (C).
Kokkarebellur Bird Sanctuary is noticed in
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Mandya
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Mysore
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Chamarajnagar
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Hassan
Explanation
Kokkarebellur Bird Sanctuary is located in Mandya district which is 80km away from Banglore.
Storks and the pelicans are the major inhabitants of the bird sanctuary located here in the village.
It has the inhabitants of the largest flora of the birds. So, the correct answer is option A.
Extinction of biodiversity is caused by the habitat degradation, fragmentation, over-harvesting and introduction of new species, described as
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Evil quartet
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Four horsemen
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Both A and B
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Succession
Explanation
Evil quartet or four horsemen of the ecological apocalypse explains the four main human-induced causes of extinction which were habitat degradation, fragmentation, the introduction of exotic species and over-harvesting. Thus, the correct answer is option C.
The number of taxa present within a particular area or an ecosystem is
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$$\alpha$$- Diversity
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$$\beta$$- Diversity
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$$\gamma $$- Diversity
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$$\delta$$- Diversity
Explanation
The mean species diversity in sites or habitats at a local scale is known as alpha diversity. R. H. Whittaker introduced the term alpha diversity.
It can be calculated in both extinct and extant landscapes. It can be measured by counting the number of taxa in a particular ecosystem.
So, the correct answer is option A.
Identify the correct description of rivet popper hypothesis.
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Increase in the population of species damage the ecosystem
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Loss of species damage the ecosystem
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Population cannot grow above the carrying capacity of environment
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None of the above
Explanation
Ecologist Paul Ehrlich compared the rivets with species and aeroplane with the ecosystem. As the removal of rivets from the aeroplane can result in loss of safety and may lead to a crash. Similarly if species are removed out of the ecosystem that will result in damage of the ecosystem. Further, if the rivets that hold together the seats or the windows are removed the loss will be gradual and the damage will be less. However, if the rivets of the wings are removed the damage will be of greater intensity. Similarly, the loss of critical species from the ecosystem will result in a greater negative impact on the ecosystem than any other species.
So, the correct answer is '
Loss of species damage the ecosystem'
The phrase "evil quartet" was coined by
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G. Donnan
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J. Daimond
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P. Erlich
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None of the above
Explanation
Jared Diamond, a biologist coined the phrase 'evil quartet' to explain the four main human-induced causes of extinction which were habitat degradation, fragmentation, the introduction of exotic species and over-harvesting. Thus, the correct answer is option B.
The concept of Hot-Spot was first introduced by ?
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Mayer
0%
Simpson
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Myers
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David
Explanation
Norman Myers was the person who introduced the concept of the hot-spot in 1988. The scientist wrote a paper on the concept of the hot-spot. This type of protected regions can be created in the tropical forests. This region helps in the conservation of biodiversity as well as the protection of certain endangered species.
Thus, the correct answer is option C.
Rivet popper hypothesis was given by
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Paul Ehrlich
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Tansley
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E.P. Odum
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None of the above
Explanation
Rivet hypothesis was given by Paul Ehrlich. It states that loss of many species in an ecological unit decreases ecosystem functioning.
So, the correct answer is '
Paul Ehrlich'
The species diversity decreases from lower to higher altitudes on a mountain. This is due to
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Increase in temperature
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Decrease in temperature
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Greater seasonal variability
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Both B and C
Explanation
Biodiversity varies with a change in altitude or latitude. The diversity increases as we move from high to low altitudes (i.e., from poles to equator). In the temperate region, the climate is severe with the short growing period for plants while in tropical rain forests the conditions are favourable for growth throughout the year. This makes it possible for a large number of species to occur and grow. There is a decrease in species diversity from lower to higher altitudes on a mountain. Drop in temperature and greater seasonal variability at higher altitudes are a major factor that reduces diversity. So, the correct option is D.
Which one of the following is an example of ex situ conservation?
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Wild life sanctuary
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Seed bank
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Sacred groves
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National park
Explanation
Ex-situ conservation is the preservation of samples of biological origin outside their natural habitats. This involves conservation of genetic resources as well as wild and cultivated species.
A seed bank stores seeds as a source for planting in case seed reserves elsewhere are destroyed. It is a type of gene bank. The seeds stored may be food crops or those of rare species to protect biodiversity. Whereas i
n-situ conservation is the conservation and maintenance of samples of living organisms in their natural habitat. Wild life sanctuary, sacred groves and national park are examples of in-situ conservation.
Thus, the correct answer is option B.
All non-domesticated and non-cultivated biota in the natural environment are termed
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Wildlife
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Ordinary life
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Domesticated life
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Stray life
Explanation
The term biota refers to a group of animals, plants or other organisms that share the same geographical region. All non domesticated and non cultivated biota in natural environment are called wild life. E.g. Lion, deer etc and plants like sunflower, thyme present in the natural environment.
So, the correct answer is '
Wildlife'
Spot out the zone of our country considered as the hot spot of biodiversity and regarded as the 'Cradle of Speciation'.
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Himalayan base
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Deccan plateau
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Western ghats
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North East
Explanation
The eastern himalayas are considered as cradle of speciation due to their rich plant diversity. They are extremely rich in endemic plant and species and are active centres of evolution and rich diversity of flowering plants.
Thus, the correct answer is option A.
Match List-I with List-II and select the correct answer using the code given below the Lists:
List-I (Region)
List-II (Characteristic vegetation)
A.
Selvas
1.
Tropophytes
B.
Savanna
2.
Mosses and lichens
C.
Tundra
3.
Epiphytes
D.
Monsoon land
4.
Grasses and trees
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A-3, B-2, C-4, D-1
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A-1, B-4, C-2, D-3
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A-1, B-2, C-4, D-3
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A-3, B-4, C-2, D-1
Explanation
Selvas is a tropical rain forest. It has characteristic vegetation as tall broad-leaved evergreen trees, epiphytes and lianas. Savanna is a mixed-grass ecosystem. The characteristic vegetation in this area is grasses such as red oats grass, star grass, lemon grass, some shrubs. Apart from grasses, it also has tress like pine trees, palm trees, etc. Tundra is the coolest biome. It has characteristic vegetation mainly as grasses, shrubs, mosses and lichens. Monsoon land has characteristic vegetation as tropophytes. These plants act as a hygrophyte in one season and xerophytes in other season. They shed their leaves in the dry season.
Thus, the correct answer is 'A-3, B-4, C-2, D-1.'
Which one of the following is not an example of ex-situ conservation of endangered species?
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Zoological park
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National park
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Culture collection
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Botanical garden
Explanation
Ex-situ conservation is the preservation of threatened animals and plants outside their natural habitats.
The animals are placed under special care by removing them from their natural habitat.
Hence it is also called offsite conservation. For example- National parks, Botanical gardens, Wildlife Safari parks, etc.
Thus, the correct answer is option B.
Read the statements and choose the correct option :
A : Sacred grooves are examples of in situ conservation
B : Biodiversity hotspots have low degree of endemism.
C : Biodiversity increases when number of organisms in a particular species increases.
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Statement 'A' alone is correct.
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Statements 'A' and 'B' are correct.
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Statements 'A' and 'C' are correct.
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Statement 'C' alone is correct.
Explanation
Areas of forests where plant species are conserved for religious importance are called sacred groves. The locals believe that these areas are the residing places of Gods and are worshiped for generations. These areas have high biodiversity and are an example of in situ conservation. Thus the correct answer is option A.
Hoolock Gibbon (India's only ape) is found in
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Simplipal National Park
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Desert National Park
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Kaziranga National Park
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Rajaji National Park
Gir Lion Sanctuary Project was started in the year
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1976
0%
1972
0%
1962
0%
1952
Given below is the representation of the extent of the global diversity of invertebrates. What groups do the four positions (A-D) represent respectively?
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A- Insects, B- Crustaceans, C- Other animal groups, D- Molluscs
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A- Crustaceans, B- Insects, C- Molluscs, D- Other animal groups
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A- Molluscs, B- Other animal groups,C- Crustaceans, D- Insects
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A- Insects, B- Molluscs, C- Crustaceans, D- Other animal groups
Explanation
97% of all animals are invertebrates.
Insects (A) belong to the phylum Arthropoda which is the largest phylum of the animal kingdom.
Mollusca(B) is the second-largest phylum of the animal kingdom followed by class Crustacea (C) of the Arthropoda phylum.
Other animal groups (D) combinedly indicate the last position in the chart.
.
Thus, the correct answer is option D.
Keoladeo Ghana and Simlipal are situated at
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Wildlife sanctuaries and biosphere reserve are situated at Bharatpur (Rajasthan) and Odisha
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National park and biosphere reserve are situated at Madhya Pradesh and Odisha
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Wildife sanctuaries and National park are situated at Rajasthan and Odisha
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National park and biosphere reserve are situated at Rajasthan and Odisha
Explanation
Keoladeo National park is a man-made and man maintained the national park in Bharatpur, Rajasthan. It is spread over an area 29 sq. km and is locally known as Ghana. Simlipal National Park is situated in Mayurbhanj district of Odisha.
Hence, the correct answer is option D.
India has two hotspots North-East Himalayas and Western Ghats which are rich in
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Some mammals
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Swallowed tailed butterflies
0%
Amphibian, reptiles, some mammals, butterflies and flowering plants
0%
Reptiles
Explanation
Hotspots are areas with high density of biodiversity or megadiversity, which are also the most threatened ones. It helps to protect the endangered and threatened species. The two hotspots of India, are the north-east Himalayas and western ghats, which are rich in amphibians, reptiles, some mammals and flowering plants. These have large varieties of flora and fauna which are the source of biodiversity.
So, the correct answer is option C.
Total number of biodiversity hot spots in the world are
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24
0%
12
0%
34
0%
52
Explanation
The different variety of flora and fauna present in a particular region is known as biodiversity. Biodiversity hotspot has a high percentage of the biodiversity. It is important due to the high vulnerability of habitats and high irreplaceability of species found within the large geographic region. It consists of endemic and threatened species. The total number of biodiversity hot spots in the world are 34. So, the correct answer is option C.
In your opinion, which is the most effective way to conserve the biodiversity of a region?
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By creating biosphere reserve
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By ex situ conservation
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Both A and B
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In situ conservation
Explanation
In situ conservation methods are most effective ways to conserve the biodiversity of a region. The biosphere reserve is an in situ conservation method. By in situ conservation biodiversity including genetic diversity can be preserved and conserved by protecting wild population traditional life style and domesticated plant genetic resources.
Write the correct sequence of genetic diversity.
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Kingdom $$\rightarrow$$ species $$\rightarrow $$chromosomes$$ \rightarrow $$genes $$\rightarrow$$
nucleotides
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Population $$\rightarrow$$species $$\rightarrow$$ chromosomes $$\rightarrow$$ genes $$\rightarrow$$
nucleotides
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Species $$\rightarrow$$ genes $$\rightarrow$$population $$\rightarrow $$ chromosomes$$ \rightarrow $$ nucleotides
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Kingdom $$ \rightarrow$$ population $$\rightarrow$$ species $$\rightarrow$$ genes $$\rightarrow$$ chromosome $$\rightarrow$$
nucleotides
Explanation
Genetic diversity is the diversity in the number and types of genes as well as chromosomes present in different species and variations in the gene and their alleles in the same species.
Population $$\rightarrow $$Species $$\rightarrow $$Chromosomes $$\rightarrow $$Genes $$\rightarrow $$Nucleotide is the correct sequence of genetic diversity.
Which of the following helps in maintaining species diversity in a community?
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Omnivores
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Predators
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Herbivores
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Facultative parasites
Explanation
Species diversity is defined as the number of different species in a given community. The species diversity in a community is maintained by predators. Predators are organisms that feed on prey. They can increase, decrease or leave unchanged species diversity. They increase species diversity by preying on competitive dominant species and reduce species diversity by reducing consumer pressure on foundation species.
Thus, the correct answer is 'Predators.'
Let no one species encroach over the right and privileges of other species is the stanza from
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Atharva Veda
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Isha Upanishad
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Kautilyas Arthashastra
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Bhagvat Geeta
Explanation
Isha Upanishad is one of shortest Upanishads, which is embedded as the final chapters of Shukla Yajurveda, the following stanza is found in this upanishad.
So, the correct answer is '
Isha Upanishad'
Genomic DNA library is
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Packing of donor DNA in a collection of vectors.
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A collection of gene vectors.
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Collection of organisms for extracting DNA.
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A collection of literature about DNA.
Explanation
$$\textbf {Correct Option (A):} $$
$$\textbf {Solution:} $$
$$\textbf {Option (A):} $$
$$\bullet$$ Genomic DNA library is the library that consists of the total genomic DNA information of an organism.
$$\bullet$$ This DNA is fragmented and then store into vectors and because genomic DNA is large in size we require multiple vectors to fit in all the genomic DNA of an organism.
$$\textbf {Option (B):} $$
$$\bullet$$
$$\textbf {Option (C):} $$
$$\bullet$$
$$\textbf {Option (D):} $$
$$\bullet$$
Hence, the option(A) is the correct answer.
Which of the following ecosystems exhibits maximum genetic variations
?
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Tropical rain forests
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Tropical evergreen forests
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Coniferous forests
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Temperate forests
Explanation
Species diversity or genetic variation increases as one proceeds from h
igh altitude to low altitude and high latitude to low latitude. Tropical rain forests are wet and dense. They exhibit maximum genetic variations due to increased temperature and
rainfall.
They show high animal and plants biodiversity.
Thus, the correct answer is 'Tropical rain forests.'
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Practice Class 12 Medical Biology Quiz Questions and Answers
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