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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 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.
In the light of the above statements, choose the most appropriate answer from the options given below :
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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Cornell studied two barnacles – Chthamalus and Balanus. Chthamalus is usually found higher on the rocks. He removed Balanus from the rocks at several sites.
The result showed that Chthamalus spread into the region formerly occupied by Balanus.
The correct conclusion will be:
The result showed that Chthamalus spread into the region formerly occupied by Balanus.
The correct conclusion will be:
| 1. | Interspecific competition makes the realized niche of Chthamalus much larger than its fundamental niche. |
| 2. | Interspecific competition makes the realized niche of Chthamalus much smaller than its fundamental niche. |
| 3. | Interspecific competition makes the realized niche of Balanus much larger than its fundamental niche. |
| 4. | Interspecific competition makes the realized niche of Balanus much smaller than its fundamental niche. |
Subtopic: Population Interactions: Competition |
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The number of correct statements amongst the given is:
| Statement I: | Parasitism has evolved in many taxonomic groups from plants to higher vertebrates. |
| Statement II: | Many parasites have evolved to be host-specific and both tend to co-evolve. |
| Statement III: | All parasites have only one primary and one intermediate host. |
| Statement IV: | Only a few of the parasites harm their hosts. |
| 1. | 1 | 2. | 2 |
| 3. | 3 | 4. | 4 |
Subtopic: Population Interactions: Parasitism |
73%
From NCERT
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The given picture shows Cascuta, commonly found growing on hedge plants. Such relationship is also exemplified by:
| I: | Lice on humans and ticks on dogs |
| II: | Marine fish infested with ectoparasitic copepods |
| III: | Female Anopheles biting human beings |
| IV: | Tapeworm in the human alimentary canal |
| 1. | Only I and II | 2. | Only III and IV |
| 3. | Only I and III | 4. | Only II and IV |
Subtopic: Population Interactions: Parasitism |
79%
From NCERT
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Consider the two statements given below:
1. Only Statement I is correct
2. Only Statement II is correct
3. Both Statement I and Statement II are correct
4. Neither Statement I nor Statement II is correct
| Statement I: | The morphological and anatomical features of endoparasites are greatly simplified but their reproductive potential is very high. |
| Statement II: | Unlike ectoparasites, endoparasites live inside the host body at different sites and their life cycles are more complex. |
2. Only Statement II is correct
3. Both Statement I and Statement II are correct
4. Neither Statement I nor Statement II is correct
Subtopic: Population Interactions: Parasitism |
83%
From NCERT
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