Q. No.Ecologists suggest that life history traits in organisms are influenced by:
| 1. | Only abiotic factors like temperature and water. |
| 2. | Only biotic factors like food and predators. |
| 3. | The age of the organisms in the population. |
| 4. | Both abiotic and biotic components of the habitat. |
Subtopic: Life History Variations |
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Consider the two statements:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | Pacific salmon fishes breed only once in their lifetime. |
| II: | Most birds and mammals breed many times during their lifetime. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Life History Variations |
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How have life history traits of different species evolved according to ecologists?
| 1. | They have evolved randomly, without any influence from the environment. |
| 2. | They are shaped by abiotic and biotic factors in the habitat, determining reproductive strategies and survival mechanisms. |
| 3. | They are identical across all species, as evolution follows a single path. |
| 4. | They only evolve in response to predation pressure, not other ecological constraints. |
Subtopic: Life History Variations |
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What do ecologists suggest about the evolution of life-history traits?
| 1. | They evolve randomly. |
| 2. | They evolve only due to climate. |
| 3. | They evolve in response to abiotic and biotic constraints of the habitat. |
| 4. | They evolve only due to predation. |
Subtopic: Life History Variations |
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Consider the two statements:
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
| I: | Pelagic fishes produce a large number of small-sized offspring. |
| II: | Most birds and mammals produce a small number of large-sized offspring. |
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
Subtopic: Life History Variations |
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Level 1: 80%+
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In response to selection pressures, organisms tend to:
| 1. | Avoid reproduction altogether. |
| 2. | Maintain constant reproductive strategies regardless of the environment. |
| 3. | Evolve reproductive strategies that maximize their survival and fitness. |
| 4. | Reproduce only when there are no competitors in the habitat. |
Subtopic: Life History Variations |
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Some organisms have big-bang reproduction – they breed only once in their lifetime, produce many progeny and usually die after the event. An example of such organism may be:
| 1. | Most perennial plants | 2. | Birds |
| 3. | Pacific salmon | 4. | Humans |
Subtopic: Life History Variations |
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Choose a correct statement regarding life history variations
1. Mammals breed only once in life time
2. Some organisms like Bambusa breeds many times in life
3. Large number of small sized individuals are produced by Oyesters
4. Large number of small sized individuals are produced by Mammals
Subtopic: Life History Variations |
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Mark the incorrect match
(1) Oysters, pelagic fishes - Small-sized offspring
(2) Pacific salmon fish, bamboo - Breed many times in life time
(3) Birds, mammals - Large-sized offspring
(4) Birds, mammals - Breed many times in life time
Subtopic: Life History Variations |
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Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
In the light of the above statements, choose the most appropriate answer from the options given below :
| Assertion (A): | Ability to maintain a constant internal environment enhances the overall ‘fitness’ of the species. |
| Reason (R): | A constant internal environment permits all biochemical reactions and physiological functions to proceed with maximal efficiency. |
| 1. | (A) is true but (R) is false. |
| 2. | (A) is false but (R) is true. |
| 3. | Both (A) and (R) are true and (R) explains (A). |
| 4. | Both (A) and (R) are true but (R) does not explain (A). |
Subtopic: Life History Variations |
88%
Level 1: 80%+
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