Q. No.Which of the following pairs of organs do not represent analogous organs?
1.
Eye of an octopus and the eye of a mammal
2.
Flippers of penguins and flippers of dolphin
3.
Wings of bats and forelimbs of humans
4.
Wings of birds and wings of butterfly
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Darwin got the idea of ‘common descent with modification’ as evolution initially from his observations on:
1. geographic distribution of species
2. fossil records
3. comparative embryology
4. comparative biochemistry
Dinosaurs became extinct during the geological period:
1. Carboniferous
2. Jurassic
3. Cretaceous
4. Tertiary
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Plica semilunaris on the inside corner of the eye and, muscles in the pinna are:
| 1. | analogous structures | 2. | homologous structures |
| 3. | vestigial structures | 4. | phylogenetic structures |
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During which period of the geological time scale did the first seed plants evolve?
1. Carboniferous
2. Triassic
3. Jurassic
4. Cretaceous
The dominant plants during the Jurassic period were:
1. Bryophytes and Ferns
2. Gymnosperms
3. Monocots
4. Dicots
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Penicillin used to be very effective against a large number of bacteria when introduced initially but now many bacteria have developed resistance to it. This is because:
| 1. | penicillin causes gene mutations, some of which are beneficial. |
| 2. | previously resistant forms survived and reproduced better than non-resistant forms. |
| 3. | the hospital environment inhibits competition among bacteria. |
| 4. | penicillin triggers the synthesis of resistant proteins. |
The wings of birds, the forelegs of a horse, and the upper limbs of humans are:
| 1. | analogous structures | 2. | homologous structures |
| 3. | vestigial structures | 4. | phylogenetic structures |
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In some African populations, the frequency of the sickle cell allele in the human population is much higher than normal. This can be an example of:
| 1. | gene flow | 2. | heterozygote advantage |
| 3. | genetic drift | 4. | nonrandom mating |
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