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Q. No.Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A):
The availability of light on land is closely linked with that of temperature.
Reason (R):
Sun is the source for both – light and temperature.
In the light of the above statements, choose the most appropriate answer from the options given below :
1.
(A) is true but (R) is false.
2.
Both (A) and (R) are true and (R) explains (A).
3.
Both (A) and (R) are true but (R) does not explain (A).
4.
(A) is false but (R) is true.
Subtopic: Abiotic Factors: Temperature (OLD NCERT) | Abiotic Factors: Light & Water (OLD NCERT) |
82%
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Identify the correct statements:
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
| 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
Subtopic: Abiotic Factors: Light & Water (OLD NCERT) |
85%
From NCERT
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Soil is an important abiotic factor in an ecosystem because:
1. Only I
2. Only II
3. Both I and II
4. Neither I nor II
| 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
Subtopic: Response of Organisms to Abiotic Factors (OLD NCERT) |
90%
From NCERT
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Maintenance of a constant internal environment, in spite of an ever-changing external environment, by living organisms is called :
| 1. | Hemostasis | 2. | Homeostasis |
| 3. | Thermoregulation | 4. | Osmoregulation |
Subtopic: Response of Organisms to Abiotic Factors (OLD NCERT) |
82%
From NCERT
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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: Abiotic Factors: Temperature (OLD NCERT) | Abiotic Factors: Light & Water (OLD NCERT) | Response of Organisms to Abiotic Factors (OLD NCERT) |
88%
From NCERT
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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): | 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. |
Subtopic: Response of Organisms to Abiotic Factors (OLD NCERT) |
57%
From NCERT
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If the stressful external conditions are localised, the organism can:
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II and III
| 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
Subtopic: Response of Organisms to Abiotic Factors (OLD NCERT) |
77%
From NCERT
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Identify the correct statements:
1. Only Statement I
2. Only Statement II
3. Both Statement I and Statement II
4. Neither Statement I nor Statement II
| 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
Subtopic: Response of Organisms to Abiotic Factors (OLD NCERT) |
73%
From NCERT
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Select the correct statements:
1. Only I and II
2. Only I and III
3. Only II and III
4. I, II, and III
| 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
Subtopic: Adaptations (OLD NCERT) |
86%
From NCERT
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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): | 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). |
Subtopic: Adaptations (OLD NCERT) |
86%
From NCERT
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