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Q. No.Select the correct statements:
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%
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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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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): | 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. |
Subtopic: Population Attributes |
74%
From NCERT
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In an area, there are 200 carrot grass plants but only a single huge banyan tree with a large canopy.
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. | The ecological role of the banyan tree in this community is negligible when compared to that of carrot grass. |
| II. | In this community, the percent cover or biomass is a more meaningful measure of the population size. |
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: Population Attributes |
75%
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): | The number of fish caught per trap is not a good measure of its total population density in the lake. |
| Reason (R): | For ecological investigations, it is obligatory to count every individual in a population to estimate population density. |
| 1. | Both (A) and (R) are True but (R) does not explain (A). |
| 2. | Both (A) and (R) are False. |
| 3. | Both (A) and (R) are True and (R) explains (A). |
| 4. | (A) is True but (R) is False. |
Subtopic: Population Attributes |
68%
From NCERT
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If ‘N’ is the population density at time ‘t’, then its density at time ‘t+1’ is:
| I. | Nt+1 = Nt + [(B+I) – (D+E)] |
| II. | B is a measure of Natality and D is a measure of Mortality |
| III. | If (B+I) is less than (D+E), the population density will increase |
| 1. | Only I and II are correct | 2. | Only I and III are correct |
| 3. | Only II and III are correct | 4. | I, II and III are correct |
Subtopic: Population: Exponential Growth Model |
87%
From NCERT
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In the given figure, I, B, D and E stand for:
| I | B | D | E | |
| 1. | Emigration | Natality | Mortality | Immigration |
| 2. | Emigration | Mortality | Natality | Immigration |
| 3. | Immigration | Natality | Mortality | Emigration |
| 4. | Immigration | Mortality | Natality | Emigration |
Subtopic: Population Characters: Density | Population Characters: Natality & Mortality |
93%
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): | The logistic growth model is more realistic for most animal populations in nature. |
| Reason (R): | Resources for growth for most animal populations are finite and become limiting sooner or later in the nature. |
| 1. | (A) is True but (R) is False. |
| 2. | Both (A) and (R) are True and (R) correctly explains (A). |
| 3. | (A) is False but (R) is True. |
| 4. | Both (A) and (R) are True but (R) does not explain (A). |
Subtopic: Population: Exponential Growth Model | Population: Logistic Growth Model |
91%
From NCERT
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Identify the correct statements:
| I: | Pacific salmon and bamboo breed many times during their lifetimes. |
| II: | Birds and mammals breed many times during their lifetimes and produce a small number of large-sized offspring. |
| III: | Oysters and pelagic fishes produce a large number of small-sized offspring. |
| 1. | Only I and II | 2. | Only I and III |
| 3. | Only II and III | 4. | I, II and III |
Subtopic: Life History Variations |
89%
From NCERT
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The picture below shows the caterpillar of cinnabar moth. The ragwort plants on which the caterpillars feed contain alkaloid poisons. As they eat the leaves, the caterpillars store the poison and this is passed from caterpillar to pupa and finally to the imago/adult. The caterpillars have alternating orange and black bands down their bodies which are highly visible to other organisms. This type of adaptation is called as:
| 1. | Cryptic colouration | 2. | Aposematic colouration |
| 3. | Batesian mimicry | 4. | Mullerian mimicry |
Subtopic: Adaptations (OLD NCERT) |
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