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Q. No.The correct equation for exponential population growth will be:
1. dN/dt = r + N
2. dN/dt = r/N
3. dN/dt = r N
4. dN/dt = r – N
Subtopic: Population: Exponential Growth Model |
90%
From NCERT
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You can see a concave shape in the upper part of the population pyramid shown in the given figure. This might signify:
1. High birth rates
2. Low birth rates
3. High life expectancy
4. Rapid population decline
1. High birth rates
2. Low birth rates
3. High life expectancy
4. Rapid population decline
Subtopic: Age Pyramid |
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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). |
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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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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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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 female Anopheles mosquito is not considered a parasite. |
|
Reason (R): |
It actually is an ectoparasite and not an endoparasite. |
|
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: Parasitism |
72%
From NCERT
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Consider the given two statements:
|
Assertion(A): |
The evolutions of the flower and its pollinator species are tightly linked with one another |
|
Reason (R): |
The mutually beneficial system should also be safeguarded against ‘cheaters’. |
|
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: Commensalism, Protocooperation & Mutualism |
From NCERT
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An attribute present only in a population and not in an individual will be:
1. Birth
2. Death
3. Sex
4. Sex ratio
1. Birth
2. Death
3. Sex
4. Sex ratio
Subtopic: Population Dynamic |
94%
From NCERT
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