Evolution (Zoology)
- Following are the two statements regarding the origin of life
(a) The earliest organisms that appeared on the earth were non-green and presumably anaerobes.
(b) The first autotrophic organisms were the chemoautotrophs that never released oxygen.
Of the above statements which one of the following options is correct?
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Both statements are correct because primitive atmosphere was reducing and chlorophyll appeared later on. Chemoautotrophs were the first autotrophic organisms unable to perform photolysis of water and never released oxygen.
Correct Option: C
Both statements are correct because primitive atmosphere was reducing and chlorophyll appeared later on. Chemoautotrophs were the first autotrophic organisms unable to perform photolysis of water and never released oxygen.
- Which one of the following are analogous structures?
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Analogous organs are those that perform similar functions but have entirely different embryonic origins.
Correct Option: B
Analogous organs are those that perform similar functions but have entirely different embryonic origins.
- The eye of octopus and eye of cat show different patterns of structure, yet they perform similar function. This is an example of:
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The eye of octopus and eye of cat show different patterns of structure, yet they perform similar functions. This is an example of analogous organs. Analogous organs have evolved due to convergent evolution. Analogous organs have developed in the evolutionary process through adaptation of quite different organisms to similar mode of life.
Correct Option: B
The eye of octopus and eye of cat show different patterns of structure, yet they perform similar functions. This is an example of analogous organs. Analogous organs have evolved due to convergent evolution. Analogous organs have developed in the evolutionary process through adaptation of quite different organisms to similar mode of life.
- Peripatus is a connecting link between:
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Peripatus is a genus of Onychophora (Velvet worms). It is said to be a living fossil because it has been unchanged for approximately 570 million years. Peripatus is a nocturnal carnivore. Peripatus is a connecting link between Annelida and Arthropoda. It feeds by trapping its prey (mostly small insects) in a white, sticky fluid it ejects from two antennae near its head. The fluid hardens on contact with the air and then the prey becomes immoblized.
Correct Option: B
Peripatus is a genus of Onychophora (Velvet worms). It is said to be a living fossil because it has been unchanged for approximately 570 million years. Peripatus is a nocturnal carnivore. Peripatus is a connecting link between Annelida and Arthropoda. It feeds by trapping its prey (mostly small insects) in a white, sticky fluid it ejects from two antennae near its head. The fluid hardens on contact with the air and then the prey becomes immoblized.
- Forelimbs of cat, lizard used in walking; forelimbs of whale used in swimming and forelimbs of bats used in flying are an example of:
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Organs which have a common fundamental anatomical plan and similar embryonic origin whatever varied functions they may perform are regarded as homologous organs. For examples the flippers of a whale, a bats wing, fore-limb of a horse, a bird’s wing and forelimbs of human are structurally as well as functionally different.
Correct Option: C
Organs which have a common fundamental anatomical plan and similar embryonic origin whatever varied functions they may perform are regarded as homologous organs. For examples the flippers of a whale, a bats wing, fore-limb of a horse, a bird’s wing and forelimbs of human are structurally as well as functionally different.
