Darwinian fitness is represented by:
1. Low r value
2. High r value
3. High K value
4. Low K value
Subtopic: Life History Variations |
76%
Level 2: 60%+
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Under a particular set of selection pressures, organisms evolve towards the most efficient:
1. Thermoregulation
2. Water conservation
3. Respiration
4. Reproduction strategy
Subtopic: Life History Variations |
65%
Level 2: 60%+
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Which of the following is correct for r-selected species?
(1) Large number of progeny with small size
(2) Large number of progeny with large size
(3) Small number of progeny with small size
(4) Small number of progeny with large size
Subtopic: Life History Variations |
70%
Level 2: 60%+
NEET - 2016
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Evolution of population
1. Maximizing Reproductive fitness
2. Low r value
3. Minimizing Darwinian fitness
4. Both B and C
Subtopic: Life History Variations |
78%
Level 2: 60%+
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Semelparity is a reproductive strategy also known as "big bang" reproduction. This is because the single reproductive event of semelparous organisms is usually large as well as fatal. A classical example is seen in:
1. Most perennial plants
2. Mollusks
3. Pacific salmon
4. Humans
1. Most perennial plants
2. Mollusks
3. Pacific salmon
4. Humans
Subtopic: Life History Variations |
73%
Level 2: 60%+
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Most birds and mammals:
| 1. | breed many times during their lifetime and produce a small number of large-sized offspring. |
| 2. | breed only once during their lifetime and produce a small number of large-sized offspring. |
| 3. | breed many times during their lifetime and produce a large number of small-sized offspring. |
| 4. | breed only once during their lifetime and produce a large number of small-sized offspring. |
Subtopic: Life History Variations |
77%
Level 2: 60%+
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Organisms that are highly valuable in learning about phloem transport are:
1. Aphids
2. Humming birds
3. Leaf miners
4. Caterpillars
1. Aphids
2. Humming birds
3. Leaf miners
4. Caterpillars
Subtopic: Life History Variations |
Level 3: 35%-60%
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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): | Organisms living in oceans do not face any water-related problems. |
| Reason (R): | Life on Earth originated in water and is not sustainable without water. |
| 1. | Both (A) and (R) are true but (R) does not explain (A). |
| 2. | (A) is true but (R) is false. |
| 3. | (A) is false but (R) is true. |
| 4. | Both (A) and (R) are true and (R) explains (A). |
Subtopic: Life History Variations |
82%
Level 1: 80%+
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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: Life History Variations |
85%
Level 1: 80%+
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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: Life History Variations |
88%
Level 1: 80%+
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