If the core body temperature of a human body goes below 37 oC, the feedback mechanism elicited to bring the temperature back to normal will include:
1. Vasoconstriction and sweating
2. Vasodilation and sweating
3. Vasoconstriction and shivering
4. Vasodilation and shivering
Subtopic: Â Abiotic Factors: Temperature (OLD NCERT) |Â Response of Organisms to Abiotic Factors (OLD NCERT) |
 67%
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Very small animals are rarely found in polar regions mainly because:
| 1. | there is an abundance of large predators in the polar regions |
| 2. | very small animals are generally herbivores and grasses do not grow in polar regions |
| 3. | the water is found only beneath the frozen ice in polar regions |
| 4. | they have a larger surface area relative to their volume |
Subtopic: Â Response of Organisms to Abiotic Factors (OLD NCERT) |
 90%
From NCERT
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Match each item in column I with one in column II and select the correct match from the codes given:
Codes:
| Column I | Column II | ||
| A | Hibernation | P | Bears in winter months |
| B | Aestivation | Q | Air-breathing land snails |
| C | Diapause | R | Zooplankton in lakes and ponds |
| A | B | C | |
| 1. | P | Q | R |
| 2. | Q | P | R |
| 3. | P | R | Q |
| 4. | R | Q | P |
Subtopic: Â Response of Organisms to Abiotic Factors (OLD NCERT) |
 87%
From NCERT
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Kangaroo rat:
| I: | has a marsupium to nurse the young ones |
| II: | obtain enough water from the metabolic oxidation of the seeds they eat to survive and do not need to drink water at all |
| 1. | Only I is correct |
| 2. | Only II is correct |
| 3. | Both I and II are correct |
| 4. | Both I and II are incorrect |
Subtopic: Â Adaptations (OLD NCERT) |
From NCERT
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Given below are two population pyramids, both of India, one for year 2000 and another for year 2020:
| 1. | Pyramid A is of 2020 as it has a broader base |
| 2. | Pyramid B is of 2000 as it has more females in the younger age groups |
| 3. | Pyramid B is of 2020 as it has more females in the younger age groups |
| 4. | Pyramid A is of 2000 as it has a broader base |
Subtopic: Â Population Attributes |
 53%
From NCERT
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The population of Ukraine today is most likely to be affected by:
| 1. | Natality | 2. | Mortality |
| 3. | Immigration | 4. | Emigration |
Subtopic: Â Population Characters: Age Structure & Migration |
 58%
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Predators:
| 1. | act as conduits for energy transfer across trophic levels |
| 2. | do not include herbivores in broad ecological context |
| 3. | indiscriminately kill their prey |
| 4. | have a very high biotic potential |
Subtopic: Â Population Interactions: Predation |
 88%
From NCERT
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A form of mimicry where a harmless species has evolved to imitate the warning signals of a harmful species directed at a predator of them both is called as:
| 1. | Mullerian mimicry | 2. | Batesian mimicry |
| 3. | Aposematism | 4. | Camouflage |
Subtopic: Â Population Interactions: Predation |
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Fishes living in freshwater:
1. drink lot of water, pass lot of urine and constantly lose salt to the outside
2. do not drink water, pass lot of urine and constantly pick salt actively from the outside
3. do not drink water, pass highly concentrated urine and constantly pick salt actively from the outside
4. drink water, pass highly concentrated urine and constantly lose salt actively to the outside
1. drink lot of water, pass lot of urine and constantly lose salt to the outside
2. do not drink water, pass lot of urine and constantly pick salt actively from the outside
3. do not drink water, pass highly concentrated urine and constantly pick salt actively from the outside
4. drink water, pass highly concentrated urine and constantly lose salt actively to the outside
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Consider the two statements:
| I: | Haemoglobin in humans adapted to very high altitudes has a lower binding affinity for oxygen than that found in humans living at the sea level. |
| II: | Lower affinity of haemoglobin to oxygen means more oxygen can bind to haemoglobin even at low partial pressures |
| 1. | Both I and II are correct and II explains I |
| 2. | Both I and II are correct but II does not explain I |
| 3. | I is correct but II is incorrect |
| 4. | Both I and II are incorrect |
Subtopic: Â Adaptations (OLD NCERT) |
From NCERT
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