Which is the most common mechanism of genetic variation in the population of a sexually reproducing organism?

(1) Transduction

(2) Chromosomal aberrations

(3) Genetic drift

(4) Recombination

What is common to whale, seal and shark?

(1) Seasonal migration

(2) Thick subcutaneous fat

(3) Convergent evolution

(4) Homeothermy

Artificial selection to obtain cows yielding high milk output represents

In Hardy- Weinberg equation, the frequency of heterozygous individual is represented by

(1) P²

(2) 2pq

(3) pq

(4) q²

Which of the following is the correct sequence of events in the origin of life?

I.    Formation of protobionts,

II.   Synthesis of organic monomers.

III.  Synthesis of organic polymers.

IV.   Formation of DNA-based genetic systems.

(1) I,II,III,IV

(2) I,III,II,IV

(3) II,III,I,IV

(4) II,III,IV,I 

Analogous structures are a result of
(1) Convergent evolution 

(2) shared ancestry

(3) stabilising selection 

(4) divergent evolution

Which of the following structures is homologous to the wing of a bird?

(1) Wing of a moth

(2) Hind limb of rabbit

(3) Flipper of whale

(4) Dorsal fin of a shark

Following are the two statements regarding the origin of life

I.  The earliest organisms that appeared on the earth were non-green presumably

anaerobes.

II. The first autotrophic organisms were the chemoautotrophs that never released

oxygen.

Of the above statements which one of the following options is correct?

1. II is correct but I is false

2. Both I and II are correct

3. Both I and II are false

4. I is correct but II is false 

The wings of a bird and the wings of an insect are

1. homologous structures and represent divergent evolution

2. analogous structures and represent convergent evolution

3. phylogenetic structures and represent divergent evolution

4. homologous structures and represent convergent evolution

Which of the following are most suitable indicators of SO₂ pollution in the environment?

1. Lichens

2. Conifers

3. Algae

4. Fungi