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प्रश्न
How do you differentiate homologous organs from analogous organs?
उत्तर
| Sr. No. | Homologous organs | Analogous organs |
| 1. | The homologous organs have been inherited from common ancestors, with similar developmental pattern in embryos. | Analogous structures are shown in a batwing, a bird wing and an insect wing. |
| 2. | The forelimbs of a human hand, a front leg of a cat, the flipper of a whale and a bat’s, wing look dissimilar and adapted for different functions. | The analogous organs look similar but perform similar functions. |
| 3. | Their mode of development and the basic structure of bone are similar. | They have a different origin. Wings of insect are membranous extensions whereas wings of a bat is a bony structure. But performing the same function of flying. |
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संबंधित प्रश्न
(a) Select the homologous structures from the combinations given below:
(i) Forelimbs of whales and bats
(ii) Tuber of potato and sweet potato
(iii) Eyes of octopus and mammals
(iv) Thorns of Bougainvillea and tendrils of Cucurbita
(b) State the kind of evolution they represent.
Select two pairs from the following which exhibit divergent evolution. Give reasons for your answer.
(i) Forelimbs of cheetah and mammals
(ii) Flippers of dolphins and penguins
(iii) Wings of butterflies and birds
(iv) Forelimbs of whales and mammals
Some dinosaurs had feathers although they could not fly birds have feathers that help them to fly. In the context of evolution, this means that ______
Select a set of homologous organs from the following:
(A) Wings of a bat and wings of a butterfly
(B) Wings of a pigeon and wings of a bat
(C) Wings of a butterfly and wings of a pigeon
(D) Forelimbs of a duck, forelimbs of a cow and forelimbs of a lizard
Match the following.
| Column A | Column B |
| 1) Morphological evidences | a) Tail-bone or wisdom teeth |
| 2) Paleontological evidences | b) Leaf venation |
| c) Fossils |
Biogenetic law states that ______.
The fossil remains of Archaeopteryx is a connecting link between ______
Evolutionary convergence is the development of a ______.
Write avian characters of Archaeopteryx.
Industrial melanism in England after 1850 is an excellent example of Natural selection. Explain how?
