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Q. No.A keystone species in a biological community:
1.
is the primary producer.
2.
has no significant impact on the community.
3.
plays a crucial role in maintaining community structure.
4.
is a rare species that must be preserved immediately.
Subtopic: Introduction to Ecology |
85%
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The process of reciprocal evolutionary change that occurs between species or groups of species as they interact with one another is called as:
1. Character displacement
2. Coevolution
3. Competition
4. Resource partitioning
1. Character displacement
2. Coevolution
3. Competition
4. Resource partitioning
Subtopic: Population Interactions: Commensalism, Protocooperation & Mutualism |
71%
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| Assertion(A): | The logistic growth model is considered a more realistic one for a population growing under natural conditions. |
| Reason (R): | Resources for growth for most animal populations are finite and become limiting sooner or later. |
|
1. |
Both (A) and (R) are True and (R) correctly explains (A). |
|
2. |
Both (A) and (R) are True but (R) does not correctly explain (A). |
|
3. |
(A) is True; (R) is False |
|
4. |
Both (A) and (R) are False |
Subtopic: Population: Logistic Growth Model |
93%
From NCERT
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Where N = Population density at time t, r = Intrinsic rate of natural increase and K = Carrying capacity, what happens when K becomes equal to N?
| 1. | the population grows in an exponential or geometric fashion |
| 2. | the population grows in an arithmetic fashion |
| 3. | the population stops growing in size |
| 4. | the population declines in size |
Subtopic: Population: Logistic Growth Model |
80%
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Amensalism is a biological interaction where:
| 1. | an organism inflicts harm to another organism without any costs or benefits received by itself. |
| 2. | two species interact but do not affect each other. |
| 3. | one organism benefits and the other organism is neither benefited nor harmed. |
| 4. | species derive a mutual benefit. |
Subtopic: Population Interactions: Amensalism |
92%
From NCERT
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Predators:
1. Only I and II are correct
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
| I: | act as ‘conduits’ for energy transfer across trophic levels |
| II: | keep prey populations under control |
| III: | help in maintaining species diversity in a community |
2. Only I and III are correct
3. Only II and III are correct
4. I, II and III are correct
Subtopic: Population Interactions: Predation |
93%
From NCERT
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Consider the given two statements:
|
Assertion (A): |
Predators in nature are ‘prudent’. |
|
Reason (R): |
Prey species have evolved various defenses to lessen the impact of predation |
|
1. |
Both (A) and (R) are True and (R) correctly explains (A). |
|
2. |
Both (A) and (R) are True but (R) does not correctly explain (A). |
|
3. |
(A) is True; (R) is False |
|
4. |
Both (A) and (R) are False |
Subtopic: Population Interactions: Predation |
81%
From NCERT
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How many of the given statements are true?
1. 1
2. 2
3. 3
4. 4
| I: | For plants, herbivores are the predators. |
| II: | Nearly 75 percent of all insects are known to be phytophagous. |
| III: | Thorns in plants are the most common morphological means of defense against herbivory. |
| IV: | Cardiac glycosides produced by certain plants can be very detrimental to the health of herbivores. |
2. 2
3. 3
4. 4
Subtopic: Population Interactions: Predation |
71%
From NCERT
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Consider the given two statements:
|
Assertion(A): |
The Abingdon tortoise in Galapagos Islands became extinct within a decade of introduction of goats on the island. |
|
Reason (R): |
Introduction of goats also introduced a new parasite that killed Abingdon tortoise. |
|
1. |
Both (A) and (R) are True and (R) correctly explains (A). |
|
2. |
Both (A) and (R) are True but (R) does not correctly explain (A). |
|
3. |
(A) is True; (R) is False |
|
4. |
Both (A) and (R) are False |
Subtopic: Population Interactions: Competition |
89%
From NCERT
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‘Resource Partitioning’ enables:
| 1. | superior species to exclude the inferior species from the habitat. |
| 2. | co-existence of competing species. |
| 3. | reproductive isolation and speciation. |
| 4. | competing species to grow exponentially. |
Subtopic: Population Interactions: Competition |
94%
From NCERT
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