- 1(current)
Q. No.All the following are examples of analogous organs except:
| 1. | Thorn and tendrils of Bougainvillea and Cucurbita |
| 2. | Sweet potato and Potato |
| 3. | Flippers of Penguins and Dolphins |
| 4. | Eye of the Octopus and of Mammals |
Subtopic: Â Natural Selection |
 88%
Level 1: 80%+
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Industrial melanism is an example of:
| 1. | Natural selection | 2. | Mutation |
| 3. | Racial difference | 4. | Predation |
Subtopic: Â Natural Selection |
 95%
Level 1: 80%+
AIPMT - 1999
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Stabilizing selection acts to _________ in a species' population.
1. elaborate new traits
2. alter traits
3. push for directional change
4. maintain a certain phenotype
Subtopic: Â Modern Theory of Evolution |Â Natural Selection |
 79%
Level 2: 60%+
Hints
Match each item in Column-I with one item in Column-II and chose your answer from the codes given below.
|
Column-I |
Column-II |
||
| I. | Homologous organs | 1. | Eye of an octopus and the eye of a mammal |
| II. | Analogous organs | 2. | Thorn of Bougainvillea and tendril of Cucurbita |
| III. |
Vestigeal organs |
3. |
Body hair and wisdom teeth in humans |
Codes:
| I | II | III | |
| 1. | 1 | 2 | 3 |
| 2. | 3 | 1 | 2 |
| 3. | 2 | 1 | 3 |
| 4. | 1 | 3 | 2 |
Subtopic: Â Natural Selection |
 90%
Level 1: 80%+
Hints
For natural selection to bring about evolution, the trait selected by the nature must be:
| 1. | Dominant | 2. | Recessive |
| 3. | Mutant | 4. | Inherited |
Subtopic: Â Natural Selection |
 60%
Level 2: 60%+
Hints
| Assertion(A): | Natural selection is differential reproduction |
| Reason(R): | The unit of natural selection is individual |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A) |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A) |
| 3. | (A) is true but (R) is false |
| 4. | Both (A) and (R) are false |
Subtopic: Â Natural Selection |
Level 4: Below 35%
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Pouched mammals of Australia survived because:
| 1. | they all are top predators in a food chain |
| 2. | they are all herbivores and hence get to feed on large amounts of available primary production |
| 3. | of lack of competition from any other mammals |
| 4. | the Australian environment is not conducive for the survival of true placental mammals |
Subtopic: Â Natural Selection |
 82%
Level 1: 80%+
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Leaves are variously modified from photosynthetic structures to form the insect-trapping pitchers of pitcher plants, the insect-trapping jaws of Venus flytrap, and the spines of cactuses. Such leaves would be an example of:
| 1. | Homology | 2. | Analogy |
| 3. | Phenotypic plasticity | 4. | Vestigeality |
Subtopic: Â Natural Selection |
 52%
Level 3: 35%-60%
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Hints
Match each item in Column I with one in Column II and select the best match from the codes given:
Choose the correct answer from the options given below:
| Column I | Column II | ||
| (a) | Adaptive radiation | (i) | Fast emergence of resistance in bacteria against antibiotics |
| (b) | Convergent evolution | (ii) | Bones of forelimbs in Man and Whale |
| (c) | Divergent evolution | (iii) | Wings of Butterfly and Bird |
| (d) | Evolution by anthropogenic action | (iv) | Dispersion and diversification of Australian marsupials |
Choose the correct answer from the options given below:
| (a) | (b) | (c) | (d) | |
| 1. | (ii) | (i) | (iv) | (iii) |
| 2. | (i) | (iv) | (iii) | (ii) |
| 3. | (iv) | (iii) | (ii) | (i) |
| 4. | (iii) | (ii) | (i) | (iv) |
Subtopic: Â Natural Selection |Â Concept of Organic Evolution: Evidence |
 93%
Level 1: 80%+
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- 1(current)
Q. No.
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