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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: Natural Selection |
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Industrial melanism is an example of:
| 1. | Natural selection | 2. | Mutation |
| 3. | Racial difference | 4. | Predation |
Subtopic: Natural Selection |
95%
From NCERT
AIPMT - 1999
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Industrial melanism is a phenomenon that best demonstrates:
| 1. | The overuse of industrial pollutants leading to genetic mutations in species. |
| 2. | The ability of a species to change color in response to industrial pollution. |
| 3. | Evolution through natural selection, where darker individuals become more common due to industrial pollution. |
| 4. | The disappearance of industrial pollutants from the environment due to the adaptation of microorganisms. |
Subtopic: Natural Selection |
95%
From NCERT
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For natural selection to bring about evolution, the trait selected by the nature must be:
| 1. | Dominant | 2. | Recessive |
| 3. | Mutant | 4. | Inherited |
Subtopic: Natural Selection |
59%
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The frequency of an allele in a population is ultimately decided by:
| 1. | Dominance |
| 2. | Whether it is autosomal linked or sex linked |
| 3. | Forces such as natural selection |
| 4. | The number of alleles present for a particular gene |
Subtopic: Natural Selection |
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What type of natural selection is shown in the given figure?
1. Stabilising
2. Directional
3. Disruptive
4. Reverse
1. Stabilising
2. Directional
3. Disruptive
4. Reverse
Subtopic: Natural Selection |
89%
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Why is the frequency of the allele for sickle cell anemia high in certain populations in Africa?
| 1. | gene therapy has alleviated the condition |
| 2. | the disease is carried on a dominant allele |
| 3. | individuals with one allele for sickle-cell anemia are resistant to malaria |
| 4. | the mutation rates are high in humans in African continent |
Subtopic: Natural Selection |
69%
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Majority of human newborns weigh around 7 pounds. What type of natural selection might be operative here?
1. directional
2. stabilizing
3. disruptive
4. reverse
1. directional
2. stabilizing
3. disruptive
4. reverse
Subtopic: Natural Selection |
76%
From NCERT
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