Any attribute of the organism that enables the organism to survive and reproduce in its habitat is called as:
1. Adaptation
2. Phenotypic plasticity
3. Acclimatization
4. Norm of the reaction
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Kangaroo rat is capable of meeting all its water requirements through:
1. Storing water when available
2. Dry seeds and foliage
3. Metabolic water
4. Burrowing deep to get water
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. |
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All the following are adaptations in desert plants to minimize water loss except:
1. Thick cuticle
2. photosynthesis
3. CAM pathway
4. Sunken stomata
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A thick layer of fat, blubber, beneath the skin is found in:
1. Terrestrial mammals of colder climates
2. Aquatic mammals of colder climates
3. Terrestrial mammals of warmer climates
4. Aquatic mammals of warmer climates
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High altitude acclimatization in humans include all the following except:
1. | Increased RBC production |
2. | Increased breathing rate |
3. | Increased heart rate |
4. | Increased binding affinity of haemoglobin |
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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): | Ice fish is able to thrive in Antarctic water where the temperature is always below zero. |
Reason (R): | They have a special haemoglobin molecule that has very high affinity for oxygen. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
3. | (A) is true but (R) is false. |
4. | Both (A) and (R) are false. |
1. | Cryptic colouration | 2. | Aposematic colouration |
3. | Batesian mimicry | 4. | Mullerian mimicry |