
Given below are diagrams showing the different stages in the process of fertilisation of an egg in the female reproductive tract:
Study the diagrams and answer the questions:

(i) Arrange the letters given below each diagram in a logical sequence to show the correct order in the process of fertilisation.
(ii) Where does fertilisation normally take place? What is ‘implantation’ that follows fertilisation?
(iii) Mention the chromosome number of the egg and zygote in humans.
(iv) Explain the term 'Gestation'. How long does gestation last in humans?
(v) Draw a neat labelled diagram of a mature human sperm.
Study the diagrams and answer the questions:

Important Questions on Reproductive System
Give appropriate biological or technical terms for the following:
The onset of menstruation in a young girl.

Give appropriate biological or technical terms for the following:
The fluid that surrounds the foetus.

Differentiate between the following pairs on the basis of what is indicated in the brackets.
Testosterone and Oestrogen [organ which secretes].

Give biological explanations for the following:
The placenta is an important structure for the development of a foetus.

Name the following:
The structure which connects the placenta and the foetus.

Correct and rewrite the statements by changing the biological term that is underlined in the statement:
The protective sac which develops around the developing embryo is called the Pericardium.

Choose the correct answer from each of the four options given below:
On which day of the menstrual cycle does ovulation take place?

Mention the exact location of the following
Testis.
