Q. No.What is true about the isolated small tribal populations?
1.
There is no change in population size as they have a large gene pool.
2.
There is a decline in population as boys marry girls only from their own tribe.
3.
Hereditary diseases like color blindness do not spread in the isolated population.
4.
Wrestlers who develop strong body muscles in their lifetime pass this character on to their progeny.
In the case of peppered moth (Biston betularia), the black-colored form became dominant over the light-colored form in England during the industrial revolution. This is an example of:
| 1. | Inheritance of darker color character acquired due to the darker environment. |
| 2. | Natural selection whereby the darker forms were selected. |
| 3. | Appearance of the dark-colored individuals due to very poor sunlight |
| 4. | Protective mimicry |
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| Convergent evolution | Divergent evolution | |
| 1. | Bones of forelimbs of vertebrates | Wings of butterflies and birds |
| 2. | Thorn of Bougainvillea and tendrils of Cucurbita | Eye of Octopus and mammals |
| 3. | Eye of Octopus and mammals | Bones of forelimbs of vertebrates |
| 4. | Thorns of Bougainvillea and tendrils of Cucurbita | Wings of butterflies and birds |
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Evolution of different species in a given area starting from a point and spreading to other geographical areas is known as
1. Migration
2. Divergent evolution
3. Adaptive radiation
4. Natural selection
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What is the most significant trend in the evolution of modern man (Homo sapiens) from the ancestors?
1. Increasing cranial capacity
2. Upright posture
3. Shortening of jaws
4. Binocular vision
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The idea of mutation was brought forth by:
| 1. | Hardy Weinberg, who worked on allele frequencies in a population. |
| 2. | Charles Darwin, who observed a wide variety of organisms during the sea voyage. |
| 3. | Hugo do Vries, who worked on evening primrose. |
| 4. | Gregor Mendel, who worked on PisumSativum. |
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The process by which organisms with different evolutionary histories evolve similar phenotypic adaptations in response to a common environmental challenge is called:
| 1. | Natural selection | 2. | Convergent evolution |
| 3. | Non-random evolution | 4. | Adaptive radiation |
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The eye of an octopus and the eye of a cat show different patterns of structure, yet they perform similar functions. This is an example of:
| 1. | Homologous organs that have evolved due to convergent evolution. |
| 2. | Homologous organs that have evolved due to divergent evolution. |
| 3. | Analogous organs that have evolved due to convergent evolution. |
| 4. | Analogous organs that have evolved due to divergent evolution. |
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Variation in gene frequencies within populations can occur by chance rather than by natural selection. This is referred to as
1. Genetic flow
2. Genetic drift
3. Random mating
4. Genetic load
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