Q. No.Identify the correct statements:
Statement I:
Many plants depend on sunlight to meet their photoperiodic requirement for flowering.
Statement II:
Many animals use photoperiod cues for timing their foraging, reproductive and migratory activities.
Statement III:
The spectral quality of solar radiation is not important for life.
1. Only Statement I and Statement II
2. Only Statement I and Statement III
3. Only Statement II and Statement III
4. Statement I, Statement II and Statement III
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| I. | Its characteristics determine, to a large extent, the vegetation in any area. |
| II. | In the aquatic environment, the sediment characteristics often determine the type of benthic animals that can thrive there. |
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
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| 1. | Hemostasis | 2. | Homeostasis |
| 3. | Thermoregulation | 4. | Osmoregulation |
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| 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). |
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| Assertion (A): | Conformers resign themselves to sub-optimal performance if the prevailing environmental conditions are not in their range of tolerance. |
| Reason (R): | An overwhelming majority of animals and nearly all plants cannot maintain a constant internal environment. |
| 1. | Both (A) and (R) are true and (R) explains (A). |
| 2. | Both (A) and (R) are true but (R) does not explain (A). |
| 3. | (A) is true but (R) is false. |
| 4. | (A) is false but (R) is true. |
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| I. | migrate temporarily |
| II. | suspend their development till the return of favourable conditions |
| III. | become ‘regulators’ if they are ‘conformers’ |
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
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| Statement I: | Bears go into aestivation to avoid summer related problems – heat and dessication. |
| Statement II: | Snails and fish go into hibernation during winter. |
1. Only Statement I
2. Only Statement II
3. Both Statement I and Statement II
4. Neither Statement I nor Statement II
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| I. | Many adaptations have evolved over a long evolutionary time and are genetically fixed. |
| II. | Kangaroo rat has a remarkable ability to concentrate its urine. |
| III. | In Opuntia, leaves are reduced to spines and the photosynthetic function is taken over by the flattened stems. |
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II, and III
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| Assertion (A): | Tribes living in high altitudes of Himalayas normally have a higher RBC count [or total haemoglobin] than people living in the plains. |
| Reason (R): | In low atmospheric pressure of high altitudes, the hypoxic conditions lead to an increased production of RBCs by bone marrow. |
| 1. | Both (A) and (R) are true and (R) explains (A). |
| 2. | (A) is true but (R) is false. |
| 3. | (A) is false but (R) is true. |
| 4. | Both (A) and (R) are true but (R) does not explain (A). |
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| Assertion (A): | Population ecology links ecology to population genetics and evolution. |
| Reason (R): | It is at the population level that natural selection operates to evolve the desired traits. |
| 1. | Both (A) and (R) are true and (R) explains (A). |
| 2. | Both (A) and (R) are true but (R) does not explain (A). |
| 3. | (A) is true but (R) is false. |
| 4. | (A) is false but (R) is true. |
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