Q4 of 63 Page 160

How are carbon dioxide and urea, excreted by the foetus, removed? ……………………………………………………………………

The nitrogenous wastes that are formed by the foetus are transferred from its blood into the mother’s blood, through the placenta. This waste is then carried on to the kidneys of the mother.


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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. …………………………

 5

Does the foetus inside the mother’s uterus breathe? Yes/No

 6

Write one sentence each using the following terms pertaining to reproduction in humans.

(i) Gestation ………………………………


(ii) 280 days ………………………………………………


(iii) Head first ……………………………………………


(iv) Placenta ………………………………………………


(v) After-birth ……………………………………………


(vi) Tied and cut ……………………………………….