Life Begins
NIOS · Class 10 · Home Science
Flashcards for Life Begins — NIOS Class 10 Home Science. Quick Q&A cards covering key concepts, definitions, and formulas.
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What is a zygote?
Answer
The fertilised ovum is called a zygote. It is formed when the sperm from the man unites with the egg from the woman during fertilisation.
What happens to the zygote after fertilisation?
Answer
The zygote gets attached to the uterus and starts growing by drawing nutrition from the mother's body.
What is the correct order of development before birth?
Answer
Fertilised ovum is called zygote. After attachment and early growth it is called embryo. When it attains human form, it is called foetus. After birth, it is called a baby.
Why is missed menstrual period an important sign of pregnancy?
Answer
Missed menstrual period is the first indication of pregnancy in every woman. It is one of the earliest signs that the body has started changing after fertilisation.
What breast changes may happen during pregnancy?
Answer
The breasts may become enlarged and tender. The nipples become more prominent, and the dark area around the nipple called areola becomes darker and enlarges.
Why may urination become more frequent near the end of pregnancy?
Answer
Frequency of urination may increase towards the end of pregnancy because the growing foetus and uterus put pressure on nearby organs.
Who determines the sex of the baby?
Answer
The father's chromosome determines the sex of the baby.
How long does pregnancy last?
Answer
Pregnancy lasts about 280 days, or nine months. This is called the prenatal period.
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