Theories of Evolution

Q.

The presence of gill slits in the embryos of all vertebrates supports the theory of

1. Metamorphosis

2. Biogenesis

3. Organic evolution

4. Recapitulation

Q. Variations caused by mutation, as proposed by Hugo de Vries, are

1. small and directionless
2. random and directional
3. random and directionless
4. small and directional

Q. According to Hugo de Vries, the mechanism of evolution is

1. phenotypic variation
2. saltation
3. mutiple step mutation
4. minor mutation

Q.
Following are the two statements regarding the origin of life:
(i) The first organisms that appeared on earth were non-green and presumably anaerobes.
(ii) The first autotrophic organisms were chemoautotrophs that never released oxygen.
Which of the following options are correct regarding the above statements?

1. (i) is correct but (ii) is false

2. (i) is false but (ii) is correct

3. Both (i) and (ii) are correct

4. Both (i) and (ii) are false

Q. Acoording to the germplasm theory of inheritance, environmental factors affect only .

1. germ cells
2. somatic cells
3. gametes
4. stem cells

Q. Mutations are ___A___ while Darwinian variations are ___B___.

1. A- minor and directional, B- major and directionless
2. A- random and directionless, B- small and directional
3. A- small and directionless, B- random and directional
4. A- random and continuous, B- discontinuous