(a) How many spermatozoa are formed from one secondary spermatocyte?
(b) Where does the first cleavage division of zygote take place?

2

(a)

Why is it considered that the presence or absence of hymen is not an indication of virginity?

2

(a)

Why not all copulations lead to fertilisation and pregnancy?

2

(a)

A mother gets infected with a virus which causes German measles during pregnancy. Is it possible that the foetus will also get infected? How ? What are its ill-effect on the foetus?

2

(a)

How is the action of LH different in male and female?

2

(a)

Study the figure given below and answer the question that follow:

a) Identify 'a' in the figure and mention its function.
b) Mention the stage of human embryo it follows.
c) Where are the stem cells located in this embryo?
d) Which part of this stage of human embryo gets attached to endometrium to establish pregnancy?

2

(a)

The following illustration is the sequence of oogenesis in human female:

a) Mention the chromosome no. in a primary oocyte and a secondary oocyte respectively.
b) When is meiosis II completed in the oogenesis of human female?
c) At what stage is meiosis I suspended in a primary oocyte?

2

(a)

Semen consists of sperms only. Is this statement true? If no, name the other components along with their function.

2

(a)

The doctor could hear the heartbeats in a foetus. How many days of gestation period must have passed?

2

(a)

Even before birth of the baby, the mother shares a beautiful bond with the child. Explain the statement in scientific manner.

2

(a)