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CBSE Questions for Class 8 Biology Conservation Of Plants And Animals Quiz 2 - MCQExams.com
CBSE
Class 8 Biology
Conservation Of Plants And Animals
Quiz 2
Forest destruction results in:
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Loss of wildlife
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Famine, flood and drought
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Soil erosion
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All of the above
Explanation
Forest destruction or deforestation is the clearing of forests to meet the demands of the human population.
The loss of habitat caused by deforestation results in the loss of wildlife.
Deforestation leads to frequent floods and droughts. Over time, the soil loses its fertility and also its water holding capacity. A tree-covered area has a high water-holding capacity, which reduces the risk of flooding during heavy rains.
Trees and their roots provide the soil with an anchor and shelter from the wind and rain. When forests are wiped out, the land becomes exposed, leaving it vulnerable to being washed or blown away by the elements resulting in soil erosion.
Thus, the correct answer is option D.
An area which is strictly reserved for the betterment of the wildlife and where activities such as forestry, grazing or cultivation are allowed is called
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Biosphere reserve
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Reserved forest
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Sanctuary
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National park
Explanation
A biosphere reserve is a large area of protected land for conservation of wildlife, plants and animals as well as the traditional life of tribals living in the area.
Biosphere reserves have three zones, core zone where the human activity is strictly prohibited, buffer zone where limited activity is allowed and in manipulation zone, human activities are allowed.
Thus, the correct answer is option A.
Species native to a particular habitat is known as:
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Endemic species
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Endangered species
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Threatened species
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Extinct species
Explanation
Species native to a particular habitat is known as endemic species.
Endemic species are plants and animals that exist only in one geographic region.
In isolated environments such as the Hawaiian Islands, Australia, and the southern tip of Africa, as many of 90% of naturally occurring species are endemic.
So, the correct answer is option A.
.......... is not an adaptation for self protection.
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Migration
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Change in colour
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Moving in groups
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Bearing eyelike patterns
Explanation
Migration involves the movement of animal populations from one place to another and their subsequent return to avoid unfavourable environmental conditions.
For example, locusts show periodic migration.
When their population increases beyond the feeding capacity of the place of living, they migrate in search of different feeding grounds in various directions.
Similarly, Siberian cranes migrate from Siberia to the Indian sub-continent in winters and return home with the advent of summer.
Thus, the correct answer is option A.
Which of the following defines the effect of deforestation on villages?
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Top layer of the soil will be easily removed
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Soil erosion
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Less fertile soil
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All of the above
Explanation
Effects of deforestation on villages- Roots of plants hold soil particles together. In the absence of plants, the top layer of the soil will be easily removed by the action of high-speed winds or water flow. Thus, deforestation increases the chances of soil erosion. As a result, soil loses humus and become less fertile. Hence, a fertile land, which is a source of living for farmers in villages, gets converted into a desert.
Therefore, the correct answer is option D.
Which of the following defines the effect of deforestation on earth?
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Increased chances of desertification, droughts, floods
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Increase in the level of $$O_2$$
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Global warming
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Both A and C
Explanation
Effects of deforestation on the Earth:
As a result of deforestation, chances of desertification, droughts, floods, etc. increase. Deforestation can also increase the level of CO$$_2$$ in the Earth, it will lead to an increase in temperature i.e., global warming. As a result, the entire natural water cycle will get disrupted. This again increases the risk of natural calamities.
Global Warming is the increase of Earth's average surface temperature due to the effect of greenhouse gases, such as carbon dioxide emissions from burning fossil fuels or from deforestation, which trap heat that would otherwise escape from Earth.
Hence, the correct answer is option D.
Flora and fauna can be defined as:
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Flora- The community of animals in a specific region or habitat
Fauna- The plant life of particular area
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Flora- The plant life of particular area
Fauna- The community of animals in a specific region or habitat
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Flora- The aquatic life of particular area
Fauna- The community of animals in a specific region or habitat
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Flora- The plants of same species in a particular area
Fauna- Animals of same species in a particular area
Explanation
Flora is the plant life existing in a particular area. Fauna is the animal life that is present in a particular area. The type of flora and fauna found in a particular region determines the biodiversity of that particular region. The biodiversity in a particular geographical location also depends on abiotic factors like soil, water, air, wind, etc.
So, the correct answer is option B.
.......... kind of species are found only in a particular area.
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Endemic
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Pandemic
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Exotic
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All of the above
Explanation
Species found only in a particular area are known as endemic.
Endemic species are often endangered.
Pandemic species is one that is widely distributed throughout a country or continent.
Exotic species are those species that live outside their natural habitat.
Thus, the correct answer is option A.
A place where animals are protected in their natural habitat is known as?
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Sanctuary
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Zoo
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Aviary
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Park
Explanation
A place where animals are protected in their natural habitat is called a sanctuary.
An animal sanctuary is a facility where animals are protected from any disturbance to them and their habitat.
Thus the correct answer is option A.
Migratory birds fly to far away places because of ........... changes.
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Climatic
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Health
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Water
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Geographical
Explanation
Migratory birds fly to faraway places because of climatic changes.
Bird migration is the regular seasonal movement, often north and south along a flyway for breeding, food availability, habitat, and weather.
For example - Siberian cranes migrate from Russia and Siberia to India in winters.
Thus the correct answer is option A.
Which of the following can be related to zoo and wildlife sanctuary?
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Zoo - animals are kept for public exhibition, Wildlife sanctuary - area within which animals are protected from possible dangers such as hunting.
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Zoo - area within which animals are protected from possible dangers such as hunting, Wildlife sanctuary - animals are kept for public exhibition.
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Zoo - artificial habitat, Wildlife sanctuary - conserves the natural habitat of animals.
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Both A and C
Explanation
Zoo is the ex-situ conservation strategy in
which animals are conserved in
an artificial habitat and are kept for public exhibition.
Wildlife sanctuary
is an area within which animals are protected from possible dangers such as hunting in their natural habitat. Hence, it protects the animals as well as conserves the natural habitats of the animals.
Thus, the correct answer is option D.
Which one of the following can be recycled?
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Household waste
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Paper
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Wood
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All of the above
Explanation
Paper is waste that can be easily recycled. Used paper can be collected, put into machines and used as paper again. This can greatly reduce the number of trees being cut for making paper. A lot of time, energy and money are also saved in this process. So, paper recycling should be carried out more often.
So, the correct option is B.
Which of the following defines the effect of deforestation on cities (urban areas)?
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Increase the risk of floods and droughts
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Global warming
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Both A and B
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Fuel shortage
Explanation
Effects of deforestation on the Earth:
As a result of deforestation, chances of desertification, droughts, floods, etc. increase. Deforestation can increase the level of CO$$_2$$ in the atmosphere also, it will lead to an increase in temperature i.e. global warming. As a result, the entire natural water cycle will get disrupted. This again increases the risk of natural calamities.
Thus, the correct answer is option C.
Which of the following defines the effect of deforestation on wild animals?
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Habitat of wild animals is developed, then their numbers would automatically decline.
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Habitat of wild animals is destroyed, then their numbers would automatically decline.
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Habitat of wild animals is destroyed, then their numbers would increase.
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All of the above.
Explanation
Deforestation is the clearing of forest which causes loss of habitat. If the habitat of wild animals is destroyed, then their numbers would automatically decline as they start moving towards urban and rural areas to meet their requirement and search a better option for their survival.
So, the correct answer is option B.
The 'Red Data Book' provides information of:
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Endangered species
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Species of Red Sea
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Organisms that are red in colour
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Living species
Explanation
The Red Data Book is a document created for documenting and recording rare and endangered species of plants, animals, fungi, and also some local species of a particular state or country. The International Union for Conservation of Nature (IUCN), established in the year 1964, maintains the Red Data Book.
So, the correct option is A.
What is Red Data Book?
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Red coloured book
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Book that maintains an international list of all endangered animal and plant species
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Book that maintains an international list of all endangered animal species
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All of the above
Explanation
A Red Data Book contains lists of species whose continued existence is threatened. Species are classified into different categories of perceived risk. Each Red Data Book usually deals with a specific group of animals or plants (reptiles, insects, mosses). They are now being published in many different countries and provide useful information on the threat status of the species.
The red-listing assessment is a simple logical process to determine the status of the threat to a species based on available information.
Thus, Option "B" is correct.
The habitat of an animal is disturbed due to
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Migration
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Extinction of that animal
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Both A and B
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None of the above
Explanation
The habitat of an animal provides it with necessities such as shelter, food, and protection. If the habitat of an animal is disturbed, then it will be forced to go to other places in search of food and shelter. The animal could get killed by other animals in this process and may become extinct in future.
Thus, the correct answer is option C.
Plants and animals are best protected in:
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Sanctuaries
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Botanical gardens
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Zoo
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National parks
Explanation
National parks are large areas where the plant and animals are conserved in their own habitat. As they are conserved in their own habitat, they are best protected in the national parks.
Sanctuary - A
wildlife reservation where animals or birds are conserved.
Botanical garden - An establishment where plants are grown for scientific study and display to the public.
Zoo - An establishment that maintains a collection of wild animals in a different habitat.
Thus, the correct answer is option D.
Project tiger is running since ............. by central government.
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1$$^{st}$$ April 1973
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31
$$^{st}$$
April 1973
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2$$^{nd}$$ January 1985
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1
$$^{st}$$
April 1993
Explanation
Project tiger is running since 1
$$^{st}$$
April 1973 by the central government. Project Tiger is a tiger conservation programme which was launched in 1973 by the Government of India.
This project aims at ensuring a viable population of Bengal tigers in their natural habitats and also to protect them from extinction, and preserving areas of biological importance as a natural heritage forever represented as close as possible the diversity of ecosystems across the tiger's distribution in the country. The project's task force visualized these tiger reserves as breeding nuclei, from which surplus animals would migrate to adjacent forests. The Funds and commitment were mastered to support the intensive program of habitat protection and rehabilitation under the project.
The species of plants and animals which are found exclusively in a particular area are ..............
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Endemic species
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Pandemic species
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Epidemic species
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Extinct species
Explanation
An 'endemic species' is one that is only found in a particular region and nowhere else in the world. Endemism is the ecological state of a species being unique to a defined geographic location, such as an island, nation, country or other defined zone, or habitat type; organisms that are indigenous to a place are not endemic to it if they are also found elsewhere. A bicolored frog is endemic to western ghat.
A National Park provides protection to
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Landscapes
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Historical objects
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Flora and Fauna
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Entire ecosystem
Explanation
A National Park provides protection to the entire ecosystem.
A national park is a park in use for conservation of plant and animal in their own habitat. Thus, the correct answer is option D.
What do you understand by the term migration?
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Movement of an organism or a group of organisms
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Movement of natural habitat
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Movement of an organism or a group of organisms from its/their natural habitat to another place at a particular time every year.
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All of the above
Explanation
The movement of organisms in large numbers from one place to another place is known as migration.
Migration is usually an annual event in which many animals travel to faraway places in search of food and breeding ground.
Animals and birds migrate when the climatic conditions are adverse in their natural habitat.
Many birds from Siberia come to India during the winter months.
Ways by which you can save paper is?
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Collect used paper and recycle it
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Spread awareness about e-waste
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Spread awareness about the importance of soil
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All of the above
Explanation
About 80,000-1,60,000 trees are cut down daily to make up for the need for paper products worldwide. Recycling paper is the process wherein used paper is converted into a reusable form. Recycling has many benefits:
It helps save trees from cutting down.
Saves tons of water used in making fresh new virgin trees. Since recycling paper requires less water.
Saves electricity usage. Since recycling paper consumes less electrical power.
Thus collecting waste paper and recycling helps save trees and paper.
A group of organisms which are capable of .............. is called as population.
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Interbreeding
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Linking
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Both A and B
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None of the above
The 'Red Data Book' provides information on:
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Effect of red light on photosynthesis
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Threatened species
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Red-pigmented plants
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Organisms of Red Sea
Explanation
The Red Data Book contains lists of species whose continued existence is threatened. They are published in many different countries and provide useful information on the threatened species of a particular area.
Wildlife is affected to maximum when
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Protection and care is less
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Hunting and poaching is carried out
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Natural calamities occur
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Natural habitat is destroyed
Explanation
Wild animals can survive and grow best when they are in their natural habitats. So, the destruction of their natural habitats affect them adversely and their development is impaired.
So, option D is the correct answer.
What is true for national park?
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Tourism is allowed in all the areas.
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No human activity is allowed.
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Cattle grazing is allowed.
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Hunting is allowed.
Explanation
In the national parks, the plants and animals are conserved in their own habitat, exploitation of natural resources, development of dams, activities such as sport, fishing are prohibited. Human activity or settlement are prohibited in this area.
Hence, option B is correct.
Which of following options is correct about Indian alligator and Indian giant squirrel?
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Both are examples of extinct species.
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Both are found in Satpura National Park.
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Both are examples of endemic species.
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Both are examples of exotic species.
Explanation
Endemic species are those species
of plants and animals which are found
exclusively in a particular area. They are
not naturally found anywhere else. A
particular type of animal or plant may
be endemic to a zone, a state, or a country.
Indian alligators and Indian giant squirrels are endemic to India.
Destroying a forest means destroying
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Ecosystem
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Plant life
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Population of wild life
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Food and shelter of wild animals
Explanation
Destroying a forest has many negative effects on the environment. Seventy percent of earth's terrestrial animals and plants live in forests. The most adverse impact is the loss of habitat for millions of species leading to disturbance in the food chain that is an important component of the ecosystem. Thus the correct answer is option A.
Desertification happens due to:
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Deforestation
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Soil-erosion caused by water
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Soil-erosion caused by wind
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Very high temperature and low rainfall
Explanation
Desertification is defined as a process of land degradation because of climatic variations and human activities.
Overgrazing is the major cause of desertification worldwide.
Other factors are urbanization, over-drafting of groundwater, and deforestation.
Deforestation results in more soil erosion. Removal of the top layer of the soil exposes
the lower, hard, and rocky layers. This soil has less humus and is less fertile.
Gradually the fertile land gets converted into deserts. It is called desertification.
Thus, the correct answer is option A.
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