- Home
- Standard 12
- Biology
6.Evolution
easy
Definitions / Explanation : Analogous organs & Vestigial or rudimentary organs
Option A
Option B
Option C
Option D
Solution
They have almost similar appearance and perform the same function but these develop in totally different groups and are totally different in their basic structure and developmental origin e.g. Wings of butterfly (chitinous), bird (feathered), Pterodactyle and bat (skin fold) serve the same purpose of uplifting the body in air but differ in structure.
$=$ They are the useless remnants of structures or organs which might have been large and functional in the ancestors.
– Vermiform appendix in man, nictitaing membrane, auricular muscles vestigial tail in vertebrates, wisdom teeth, mammary glands in males and body hair are some of its examples.
Standard 12
Biology
Similar Questions
Match List $- I$ with List $- II.$
| List $- I$ | List $- II$ |
| $(a)$ Adaptive radiation | $(i)$ Selection of resistant varieties due to excessive use of herbicides and pesticides |
| $(b)$ Convergent evolution | $(ii)$ Bones of forelimbs in Man and Whale |
| $(c)$ Divergent evolution | $(iii)$ Wings of Butterfly and Bird |
| $(d)$ Evolution by anthropogenic action | $(iv)$ Darwin Finches |
$(a)- (b)- (c)- (d)$
Match the columns :
| Column – $I$ | Column – $II$ |
| $(1)$ Mutation | $(a)$ Change in population allele frequencies due to chance alone. |
| $(2)$ Gene flow | $(b)$ Difference insurvival and reproduction |
| $(3)$ Natural selection | $(c)$ Immigration, emigration change allele frequencies. |
| $(4)$ Genetic drift | $(d)$ Source of new alleles. |
easy
