Q. No.Though we cannot be certain, what can be the probable reason/s for the sudden disappearance of dinosaurs from the Earth?
I:
Climatic changes killed them
II:
Most of them evolved into birds
1. I only 2. II only 3. Both I and II 4. Neither I nor II
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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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