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CBSE Questions for Class 12 Medical Biology Organisms And Population Quiz 12 - MCQExams.com
CBSE
Class 12 Medical Biology
Organisms And Population
Quiz 12
How many of the following shows $$"+ -"$$ interaction?
a. Fig and wasp
b. Convolvulus and wheat
c. Sparrow and seeds
d. Tiger and deer
e. Epiphytes on mango tree
f. Plasmodium and human.
Report Question
0%
$$5$$
0%
$$2$$
0%
$$4$$
0%
$$3$$
Explanation
'+-' reaction is called Predation and it occurs between
predator and prey where one feeds on other .
So, the correct option is '2'.
Insect population grows very fast in Rainy season and they disappear in the summer season. Which kind of interaction is responsible for controlling their population size:-
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Interspecific predation
0%
Interspecific parasitism
0%
Interspecific competition
0%
Intra specific competition
Explanation
The high temperature and humidity of the rainy season provide insects with an adequate environment for breeding. Hence, their numbers increase rapidly during this season. However, during summers, as the aestivation period ends, different species of insects come out and a decrease in the insect populations is observed. This decrease could be attributed to the increase in interspecific predation amongst the species.
So, the correct answer is '
Interspecific predation'.
A group of similar ecosystems with the same general type of physical environment is called a ____
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Biosphere
0%
Population
0%
Biome
0%
None of these
Explanation
A biome is a large geographical area characterized by certain types of plants and animals. A biome is defined by the complex interactions of plants and animals with the climate, geology, soil types, water resources, and latitude of an area.
One example of a biome is a desert. Deserts are the world's driest regions. Most of the vegetation there takes the form of drought-resistant plants such as cacti, which store water in their stems and have waxy coverings, and scrubby plants like the creosote bush, that have extensive root system.
So, the correct option is 'Biome'.
Relation between clownfish and sea anemone
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Mutualism
0%
Commensalism
0%
Parasitism
0%
Amensalism
Explanation
Mutualism is the cooperation between organisms in which both the organisms are benefitted from the activity of each other.
The clownfish dwells in the tentacles of the sea anemone.
The stinging tentacles protect the clownfish from its predator while the clownfish the algae and food leftovers and keep them clean.
So, the correct answer is 'Mutualism'.
Logistic growth occurs when there is
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A fixed carrying capacity
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Asexual reproduction only
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Sexual reproduction only
0%
No inhibition from crowding
Explanation
Logistic growth occurs when the population size increases with time but levels off after reaching a maximum which is known as the carrying capacity. Carrying capacity is fixed and is the maximum number of individuals that can be supported by a population. So, the correct option is 'a fixed carrying capacity'.
If the mean and the median pertaining to a certain character of a population are of the same value, the following is most likely to occur?
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A bi-modal distribution
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A T-shaped curve
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A skewed curve
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A normal distribution
Explanation
In statistics
, a
bimodal distribution
is a continuous probability distribution
with two different modes
. These appear as distinct peaks in the probability density functions.
If the distribution is symmetric then the mean is equal to the median and the distribution will have zero skewness. Since bimodal distribution is symmetric both mean and mode fall in the center but it has two modes.
So the correct answer is option A "bimodal distribution".
The equation represents.
$${N_t} = {N_0}\exp \left( {rt} \right) = {N_0}{e^{rt}}$$
Report Question
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Integral form of exponential growth
0%
Integral form of logos-tic growth
0%
Integral form of Calculated growth
0%
Exponential form of growth.
Explanation
Ideally, when resources in the habitat are unlimited, each species
has the ability to realise fully its innate potential to grow in number,
as Darwin observed while developing his theory of natural selection.
Then the population grows in an exponential or geometric fashion.
The integral form of the
exponential growth can be represented by equation as
N$$_t$$
= N$$_0$$
e$$^{r}$$$$^{t}$$
where
N$$_t$$
= Population density after time t
N$$_0$$
= Population density at time zero
r = intrinsic rate of natural increase
e = the base of natural logarithms.
So, the correct option is 'Integral form of exponential growth'.
The interaction between the two organism in which one organism kills and feed on the second organism is called
Report Question
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Scavenging
0%
Predation
0%
Parasitism
0%
Mutualism.
Explanation
Scavenging is the mode of nutrition in which organisms feed on dead organisms. In predation one organism (the predator) kills and feeds on the other organism (the prey). In parasitism, one organism feeds on the other organism without killing the other organism. Mutualism is a mode of nutrition in which both organisms are benefited.
So, the correct option is 'Predation'.
Forest ecosystem in india is the following
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Ladakh
0%
Himalaya region
0%
Tropical rain forest
0%
Tundra
How many statements are incorrect from following?
(A) Loranthus is a partial stem parasite
(B) Arceuthobium is a smallest angiospermic parasite
(C) Bauhinia and Tinospors are example of Lianas
(D) Sea anemose and hermit crab shows
amensalism
Report Question
0%
Two
0%
One
0%
Three
0%
Four
Explanation
$$\rightarrow$$ Loranthus is a partial stem parasite as it depends on host plant for the shelter and water.
$$\rightarrow $$ Arceuthobium, a total stem parasite, is the smallest parasitic angiosperm.
It is commonly called dwarf mistletoes, Belongs to the family of pinacess
$$\rightarrow $$ Woody perennial climbers found in tropical rain forests are lianas. they twine themselves around tall trees to secure sunlight e.g. Hiptage, Bautinia etc.
$$\rightarrow $$ Sea anemones and Hermit crabs shows "commensalism not
amensalism
". It's a stable connection that side steps the typical prey and predator relationship found in nature.
$$\therefore 1$$ statement i.e. , (4) is false.
The interaction between ruminants and the bacteria in their intestine is _________.
Report Question
0%
Predation
0%
Parasitism
0%
Commensalism
0%
Mutualism
Explanation
The Interaction between the ruminants and the bacteria in their intestine is mutualism or symbiotic one, as the cow provides the Bacteria a warm, moist environment with a constant supply of food. In return the Bacteria enable the cow to access the nutrients in their cellulose rich diet and provide a protein source.
The parasitism in which the host and parasite belong to the same genus or family is
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0%
kleptoparasitism
0%
adelphoparasitism
0%
hyperparasitism
0%
brood parasitism
When a person dies in old age after completing the life span, then, the survivorship curve for that person is:-
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0%
J -shape
0%
Concave
0%
S-shaped
0%
Convex
Explanation
Survivorship curves are the graphs or curves that depict the survival of the number of individuals according to age or time. It of three types:
Type 1 - It shows that the individual has a high chance of survival until adulthood. It can normally complete the life cycle and the curve is called a convex curve.
Type 2 - It shows that the survival of an individual is not dependent upon the age.
Type 3 - It shows that the individual has fewer chances of survival and dies at an early age.
So, the correct option is '
Convex'.
A sedentary sea anemone gets attached shell lining of hermit crab. The association of?
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Amensalism
0%
Ectoparasitism
0%
Symbiosis
0%
Commensatism
Choose the incorrect one:
Report Question
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In logistic growth equation when N < K then r > 0
0%
In logistic growth equation when N=K then r= constant
0%
In logistic equation N > K then r <0
0%
In logistic growth equation N > K then r > 0
Co-evolution can be observed in case of :
Report Question
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Mutualisin, parasitism
0%
Predation, parasitism
0%
Amensalism, competition
0%
Competition, commensalism
During $$2010-2012$$ a square jungle having $$5$$k length has $$5000$$ bamboos. So what will be the population density of it?
Report Question
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$$100$$
0%
$$500$$
0%
$$50$$
0%
$$200$$
Following table summarizes the differences between natality and mortality. Select the incorrect ones.
Natality
Mortality
(i)
Natality is number of births per unit population per unit time.
It is number of deaths per unit population per unit time.
(ii)
It adds new individuals to the population.
It removes individuals from the population.
(iii)
It increases the size of population.
It decreases the size of population.
(iv)
It increases population density.
It reduces population density.
(v)
It is low when population size is small and high when population size is large.
It is high when population size is small and low when population size is large.
Report Question
0%
(i) and (v)
0%
(iii) and (iv)
0%
(iv) only
0%
(v) only
Which of the following abiotic factors has sedimentary cycle?
Report Question
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Oxygen
0%
Carbon
0%
Phosphorus
0%
Nitrogen
The parasitism in which the parasites steal food gathered by the host is _______.
Report Question
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Kleptoparasitism
0%
Adelpho-parasitism
0%
Hyperparasitism
0%
Brood parasitism
According to scientists, estimation of emission is difficult because it depends on the
Report Question
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Population changes
0%
Technological changes
0%
Social changes
0%
All of the above
Which of the following statements is correct?
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The number of organisms can decrease but never increase once a population reaches its carrying capacity.
0%
All populations experience exponential growth once they reach carrying capacity.
0%
A population always grows rapidly once it reaches its carrying capacity.
0%
Limiting factors can influence the number of organisms in a population once it reaches its carrying capacity.
Match the column
Sr.No
a
b
c
(i)
+
+
(1) Commensalism
(ii)
+
-
(2) Competition
(iii)
-
-
(3) Parasitism
(iv)
+
0
(4) mutualism
Report Question
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$$(i) 1, (ii) 2, (iii) 3, (iv) 4$$
0%
$$(i) 2, (ii) 3, (iii) 1, (iv) 4$$
0%
$$(i) 4, (ii) 3, (iii) 2, (iv) 1$$
0%
$$(i) 3, (ii) 2, (iii) 1, (iv) 4$$
Explanation
1 - when two positive points are combined the interrelationship is called mutualism - example- Between algae and fungi as Lichen
2 - When one positive and negative is combined the interrealtionship between organisms is called as parasitism.- Example -
Cuscuta
and host plant
3 - When two negative is combined the interrelationship is called competition - example weeds and crop plants
4- when one positive and one neutral is formed the relationship is called commensalism - Example Epiphytic plants
So, the correct answer is '
(
i
)
4
,
(
i
i
)
3
,
(
i
i
i
)
2
,
(
i
v
)
1'
The interaction between "Cuckoo and Crow" is an example for
Report Question
0%
Competition
0%
Predation
0%
Brood parasitism
0%
Mutualism
Explanation
Brood parasites are organisms that rely on others to raise their young.
So, the correct answer is '
Brood parasitism'
In an area a single banyan tree overshadow $$200$$ parthenium grass. Which of the following is a more meaningful measure of population density?
Report Question
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Detritus percent
0%
Standing crop percent
0%
Total number per unit area
0%
Standing state percent
Match for M and N with species-area relationship shown in the graphic representation below and choose the correct option.
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$$M\rightarrow S={ CA }^{ Z },\quad N\rightarrow log\,S=log\,C+Zlog\,A\quad $$
0%
$$M\rightarrow S={ CZ }^{ A },\quad N\rightarrow log\,C=log\,S+Zlog\,A\quad $$
0%
$$M\rightarrow S={ CA }^{ Z },\quad N\rightarrow log\,S=log\,C+Alog\,Z\quad $$
0%
$$M\rightarrow S={ AZ }^{ C },\quad N\rightarrow log\,ZA=log\,C+log\,S\quad $$
Explanation
The species–area relationship describes the relationship between the area of a habitat and the number of species found within that area.
So, the correct answer is '
M
→
S
=
C
A
Z
,
N
→
l
o
g
S
=
l
o
g
C
+
Z
l
o
g
A
M→S=CAZ,N logS=logC+ZlogA
Match the column I and II.
Column-I
Column-II
(a)
Parasitism
(i)
$$+ +$$
(b)
Commensalism
(ii)
$$+ -$$
(c)
Amensalism
(iii)
$$0 +$$
(d)
Mutualism
(iv)
$$0 -$$
Report Question
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(a)-iii, (b)-ii, (c)-iv, (d)-i
0%
(a)-i, (b)-ii, (c)-iii, (d)-iv
0%
(a)-ii, (b)-iii, (c)-i, (d)-iv
0%
(a)-ii, (b)-iii, (c)-iv, (d)-i
Explanation
In interspecific interaction + sign indicates beneficial interaction and - sign indicates detrimental(loss) interaction and 0 indicates neutral interaction.
(a) Parasitism-(ii)$$+−$$ .
In Parasitism only one species benefits(parasite, predator) and the interaction is detrimental to the other species ( host, prey). Hence it is represented by $$+-$$.
(b) Commensalism- (iii)$$0+$$
In Commensalism one species is benefited and the other is unaffected. Hence it is represented by $$0+$$.
(c) Amensalism-(iv)$$0−$$.
In Amensalism one species is harmed whereas the other is unaffected. Hence it is represented by $$0-$$.
(d) Mutualism-(i)$$++$$
In Mutualism both the species are benefitted. Hence it is represented by $$++$$.
So, the correct answer is '(a)-ii, (b)-iii, (c)-iv, (d)-i'.
Which of the following statements is correct?
Report Question
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The number of organisms can decrease but never increase once a population reaches its carrying capacity
0%
All populations experience exponential growth once they reach carrying capacity
0%
A population always grows rapidly once it reaches its carrying capacity
0%
Limiting factors can influence the number of organisms in a population once it reaches its carrying capacity
Explanation
Answer :
i) Carrying Capacity-when the number of births equals the number of deaths, the population is at its carrying capacity for that habitat.
ii) If resources are being used faster than they are being replenished, then the species has firstly exceeded its carrying capacity.
iii) If this occurs, later the population will then decrease in size due to intraspecific competition for resources.
So the correct answer is option D. Limiting factors can influence the number of organisms in a population once it reaches its carrying capacity.
MoEF means
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Ministry of Forest and Energy
0%
Ministry of Environment and Forests
0%
Ministry of Fuel and Energy
0%
Management of Environment and Forestry
Which of the following has the least similarity when comparing two examples of the same biome located in different parts of the world?
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Climate
0%
Latitude
0%
Continent
0%
Elevation
Select the correct match
(I)
(II)
(III)
(a) +
(i) -
(P) Amensalism
(b) -
(ii) -
(Q) Commensalism
(c) -
(iii) 0
(R) Predation
(d) +
(iv) 0
(S) Competition
Report Question
0%
a - iv Q, b - iii P, c - ii S, d - i R
0%
a - i Q, b - ii P, c - iii S, d - iv - R
0%
a - i Q, b - iii P, c - ii S, d - iv R
0%
a - iv Q, b - ii P, c - iii S, d - i - R
Explanation
In interspecific interaction + sign indicates beneficial interaction and - sign indicates detrimental(loss) interaction and 0 indicates neutral interaction.
(a) +
(iv) - (Q) Commensalism - In Commensalism one species is benefited and the other is unaffected. Hence it is represented by $$+0$$.
(b) - (iii) 0 - (P) Amensalism -In Amensalism one species is harmed whereas the other is unaffected. Hence it is represented by $$0−$$.
(c) - (ii) - (S) Competition - In Competition both the species are harmed species is benefited and the other is unaffected $$- -$$.
(d)+ (i) - (R)Predation -In Predation one species is benefited and the other is harmed. Hence it is represented by $$+ -$$.
So, the correct answer is 'a - iv Q, b - iii P, c - ii S, d - i R'.
At any given time, __________ of the earth is illuminated by the sun.
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One-fourth
0%
One-third
0%
One-half
0%
Two-thirds
____________ is essentially stored solar energy that can be converted in to electricity, fuel and heat.
Report Question
0%
Biomas
0%
Fossil
0%
Heat
0%
Coal
Explanation
$$\textbf{Correct option:}$$ $$\textbf{(A)}$$
$$\textbf{Solution:}$$
$$\textbf{Option (A)}$$
$$\bullet$$ Biomass is simply solar energy that has been stored and may be transformed into power, fuel, and heat.
$$\bullet$$
Biomass refers to organic stuff derived from live or dead organisms.
$$\bullet$$
Biomass is a fuel made from a renewable source of energy.
$$\textbf{Option (B)}$$
$$\bullet$$ Fossils are the remains, tracks, impressions, or evidence of ancient species.
$$\bullet$$
These are conserved and crucial tools for evolutionary studies because they are embedded in volcanic ash, sedimentary rocks, peat, amber, and other materials.
$$\textbf{Option (C)}$$
$$\bullet$$ Heat is a type of energy that can be transmitted between two substances that are at different temperatures.
$$\bullet$$
Energy flows from a substance with a higher temperature to a substance with a lower temperature.
$$\bullet$$
Heat is quantified in energy units, most commonly calories or joules.
$$\textbf{Option (D)}$$
$$\bullet$$ Coal is a naturally occurring black material made up of carbon and carbon-containing chemicals such as hydrogen, nitrogen, oxygen, and sulphur.
$$\bullet$$
It is a significant energy source.
$$\textbf{Thus the Correct option is (A)}$$
Pick out the world s rarest monkey.
Report Question
0%
Baboon
0%
Common Marmoset
0%
Golden langur
0%
Gibbon
Match the correct column.
(I)
(II)
(III)
(a) Parasitism
(i) $$-, 0$$
(A) Both get benefitted
(b) Amensalism
(ii) $$-, -$$
(B) One get harmed other has no effect
(c) Competition
(iii) $$+, -$$
(C) Both get harmed
(d) Mutualism
(iv) $$+, +$$
(D) One is harmed and second is benefited
Report Question
0%
a-iii-D, b-i-B, c-ii-C, d-iv-A
0%
a-ii-C, b-i-B, c-iii-D, d-iv-A
0%
a-iii-D, b-i-A, c-ii-C, d-iv-B
0%
a-iii-A, b-i-B, c-ii-D, d-iv-A
Explanation
Parasitism is a relationship between species, where one organism (the parasite) lives on or in another organism (the host) causing it some harm. Hence, in parasitism, one is harmed and second is benefited.
Amensalism is a type of biological interaction. It is an association between two organisms of different species, where one is adversely affected and the other stays unaffected. Hence, in amensalism, one gets harmed and other has no effect.
Competition is an interaction between organisms or species in which both the organisms or species are harmed.
Mutualism describes the ecological interaction between two or more species where each species benefits.
So, the correct answer is 'A'.
Pencillium does not swallow the growth of bacterium Staphylococcus. This sort of relationship is called
Report Question
0%
commensalism
0%
predation
0%
amensalism
0%
mutualism
______________ refers to the phenomenon in that the organisms are exclusively restricted to a given area.
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0%
Ecosystem
0%
Endemism
0%
Habitat
0%
Food web
Match the column I and II
Column-I
Column-I
Parasitism
+ +
Commensalism
+
Amensalism
0 +
Mutualism
0
Report Question
0%
(a) - iii, (b) - ii, (c) - iv, (d) - i
0%
(a) - i, (b) - ii, (c) - iii, (d) - iv
0%
(a) - ii, (b) - iii, (c) - i, (d) - iv
0%
(a) - ii, (b) - iii, (c) - iv, (d) - i
HCFCs can be broken down in lower atmosphere, before ascending into
Report Question
0%
Stratosphere
0%
Troposphere
0%
Ionosphere
0%
Thermosphere
Scientists are able to determine the air temperature in the thermosphere by:
Report Question
0%
Using radiosondes
0%
Using temperature probes in orbiting satellites
0%
Observing changes in satellite orbits
0%
Direct measurements in manned, high-altitude balloons
Which biome is located at equatorial region?
Report Question
0%
Taiga forests
0%
Tropical Rain Forests
0%
Temperate Forest
0%
Boreal Forest
Categorically, a common feeding behavior is regarded as
Report Question
0%
Parasitism
0%
Predation
0%
micropredation
0%
All of above
Initial causes of ecological succession includes:
Report Question
0%
Climatic and Biotic factors
0%
Abiotic Factors
0%
Water Vapours
0%
Air Precipitation
Non living things in an environment is known as
Report Question
0%
Biotic Factors
0%
Abiotic Factors
0%
Biotic and abiotic factors
0%
All of above
Which ecosystem is important in purifying air, recycling water and controling climate?
Report Question
0%
Man subsidized solar power ecosystem
0%
Fuel power ecosystem
0%
Naturally subsidized solar powered ecosystem
0%
Unsubsidized natural solar powered ecosystem
The relationship between nitrogen fixing bacteria and leguminous plants is an example for
Report Question
0%
Parasitism
0%
Predation
0%
Mutualism
0%
Commensalism
DMS' stands for ______________.
Report Question
0%
Demonstrative Mass Spectrometer
0%
Departmental Management System
0%
Departmental Momentum System
0%
Demostrative Mass System
Due to complexities of biosphere, it is divided into smaller units called
Report Question
0%
Biomes
0%
Biological System
0%
Biosphere
0%
Hydrosphere
The restricted distribution of the species in a small area is called
Report Question
0%
Biome
0%
Niche
0%
Endemism
0%
Ectosphere
Explanation
The restricted distribution or presence of a particular species in a certain specific area only is called endemism.
Example, Polar bear, Kiwi etc
So, the correct answer is '
Endemism'
What will happen to a well growing herbaceous plant in the forest if it is transplanted outside the forest in a park?
Report Question
0%
It will grow normally
0%
It will grow well because it is planted in the same locality
0%
It may not survive because of change in its micro climate
0%
It grows very well because the plant gets more sunlight
Explanation
It may not survive because of change in its micro climate like the soil type, micro-organisms present in the zone surrounding its roots, the tree canopies that create certain micro environmental conditions along with other plants growing in the vicinity.
So, the correct answer is '
It may not survive because of change in its micro climate'
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Practice Class 12 Medical Biology Quiz Questions and Answers
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