Q1 of 63 Page 160

Name the three main regions of the human sperm, and briefly mention the function of each.

(i) Part …………………..Function ……………………………….


(ii) Part …………………Function …………………….


(iii) part ………………..Function ……………………

(i) Part: Acrosome


Function: It secretes an enzyme called hyaluronidase at the time of fertilization. This enzyme dissolved the membranous covering of the ovum to facilitate the entry of sperm into the ovum


(ii) Part: Tail


Function: The sperm needs to move properly through the female reproductive tract. The tail contributes to its mobility. It moves back and forth that results in a sliding motion.


(iii) Part: The middle piece or body of the sperm


Function: This part consists of mitochondria. It caters to the energy requirements of a sperm. This energy is required to traverse through the female reproductive tract.


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2

The following diagram represents the vertical sectional view of the human female reproductive system.


(a) Label the parts indicated by the guidelines 1 to 8.


(b) How does the uterus prepare for the reception of zygote?


(c) What happens to the uterus, if fertilization fails to take place?

 3

Given below is the schematic diagram of the sectional view of the human male reproductive system.


(a) Name the parts numbered 1-11.


(b) State the functions of the parts numbered 1,2,3,5,8, and 11.

 2

Fill in the blanks:

(i) Implantation is the process of fixing of the _______ in a pit in the wall of _______


(ii) Heart and circulatory system are formed in the embryo by the end of _______ months of pregnancy.


(iii) A cord containing _______ Vessels connects the _______ With the foetus.

 3

List the substances which the foetus receives from the mother through the placenta. …………………………