Formative Practice 4.3 – Science Form 1 Chapter 4


Question 1:
Explain the phases of menstrual cycle.

Answer:
(i) Menstruation phase (Day 1 – 5)
The uterine lining breaks down as menstruation begins and is discharged together with blood, unfertilised ovum and mucus.

(ii) Repair phase (Day 6 – 11)
Uterine lining starts to rebuild and thicken. Blood vessels in uterine lining are formed and ready to receive the implantation of fertilised ovum.

(iii) Fertile phase (Day 12 – 17)
An ovum is released from the ovary on the 14th day of the menstrual cycle (ovulation). The uterine lining continues to thicken. Fertilisation is likely to occur if sperms are present.

(iv) Premenstrual phase (Day 18 – 28)
The uterine lining continues to thicken and becomes richly supplied with blood vessels. Implantation of an embryo is ready if fertilisation occurs. The menstrual cycle will repeat if fertilisation does not occur.


Question 2:
At what age does a woman start to experience menstruation and how long does it last?

Answer:
A woman begins to get menstruation between 10 – 12 years old, for 5 – 17 days.


Question 3:
What is ovulation and where does ovulation normally occur?

Answer:
Ovulation is the process of a matured ovum being released from the ovary and it occurs in the ovary.


Question 4:
Is it true that you cannot wash your hair, drink cold water, eat ice cream or play sport during menstruation? Explain your answer.

Answer:
False. Menstruating women can do their daily activities as usual.

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