CBSE Class 10 Science 2020 · Paper 31/3/1 · Question 20
(a) Classify the following as homologous or analogous pairs :
- (i)Broccoli and Cabbage
- (ii)Ginger and Raddish
- (iii)Fore limbs of birds and lizard
- (iv)Wings of a bat and Wings of a bird (b) State the main feature that categorises a given pair of organs as homologous or analogous.
Answer
Broccoli-cabbage, ginger-radish and bat-bird wings are analogous; bird-lizard forelimbs are homologous; the basic structure and origin decide.
(a) (i) Broccoli and cabbage: analogous. (ii) Ginger and radish: analogous. (iii) Forelimbs of birds and lizards: homologous. (iv) Wings of a bat and wings of a bird: analogous.
(b) The origin, that is, the basic structure of the organs. Homologous organs have the same basic structure and origin but perform different functions; analogous organs have a different basic structure and origin but perform similar functions.
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