In human beings, at the end of 12 weeks (first trimester) of pregnancy, the following is observed:

(1) Eyelids and eyelashes are formed

(2) Most of the major organ systems are formed

(3) The head is covered with fine hair

(4) Movement of the fetus 

Select the correct option of haploid cells from the following groups :

Match the following columns and select the correct option:

1. (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)

2. (a)-(i), (b)-(ii), (c)-(iii), (d)-(iv)

3. (a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)

4. (a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)

Progestogens alone or in combination with estrogens can be used as a contraceptive in the form of -

(1) Implants only

(2) Injections only

(3) Pills, injections and implants

(4) Pills only 

Chromosomal theory of inheritance was proposed by:

The number of contrasting characters studied by Mendel for his experiments was :

1. 14

2. 4

3. 2

4. 7