Statement I: | Mutations are random and direction less, while Darwinian variations are small and directional. |
Statement II: | Darwin's finches represent one of the best examples of adaptive radiation. |
Assertion (A): | In terms of determination, evolution is a directed process |
Reason (R): | Nature selects those variants which are able to reproduce better and leave more progeny in the changed environmental conditions |
1. | (A) is true but (R) is false |
2. | (A) is false but (R) is true |
3. | Both (A) and (R) are true but (R) is not the correct explanation of (A) |
4. | Both (A) and (R) are true and (R) is the correct explanation of (A) |
Column-I | Column-II | ||
a. | Lamarck | (i) | Origin of life preceded by chemical evolution |
b. | Darwin | (ii) | Reproductive fitness |
c. | Haldane | (iii) | Inheritance of acquired characters |
d. | Malthus | (iv) | Populations are stable in size except for the seasonal fluctuations |
Column I | Column II | ||
a. | Saltation | (i) | Lamarck |
b. | Inheritance of acquired characters | (ii) | Hugo de Vries |
c. | Branching descent and natural selection | (iii) | Darwin |
(iv) | Thomas Malthus |
Which of the following refers to correct example(s) of organisms that have evolved due to changes in environment brought about by anthropogenic action?
(a) Darwin's Finches of Galapagos islands
(b) Herbicide-resistant weeds
(c) Drug-resistant eukaryotes
(d) Man-created breeds of domesticated animals like dogs
1. (a) and (c)
2. (b), (c) and (d)
3. only (d)
4. only (a)