Question

Answer the following: [5]
i. How is zygote formed?
ii. State the function of placenta in the mother’s body.
iii. At what interval the egg is formed in human female ovary?
iv. Name two STDs caused by bacterial infection.
v. Why is prenatal sex determination prohibited?

Answer 1

Answer:

i. Zygote is formed by the fusion of male and female

gamete.

ii. Placenta is a special tissue through which the

developing embryo/foetus gets nutrition from

mother’s blood. It also transports wastes of the

embryo into mother’s blood.

iii. Ovulation releases mature ovum from the ovary.

It happens once during a menstrual cycle that is

for roughly 28 days.

iv. STDs caused by bacterial infection are

Gonorrhoea and Syphilis.

v. Prenatal sex determination is misused and it may

be the reason for female foeticide.

Explanation:

Answer 2

Answer:

(a) Zygote is formed by the fusion of male and female gamete.

(b) Placenta is a special tissue through which the developing embryo/fetus gets nutrition from mother's blood. It also transports wastes of the embryo into mother's blood.

(c) Ovulation releases mature ovum from the ovary . It happen once during a menstrual cycle that is for roughly 28 days.

(d) STDs caused by bacterial infection are gonorrhoea and syphilis or aids.

(e) prenatal sex determination is misused and it may be the reason for female feticide.