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प्रश्न
Give scientific reasons: Mature erythrocytes in humans lack nucleus and mitochondria
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उत्तर
In case of fertilisation of the ovum by a sperm, the corpus luteum persists and continues to secrete progesterone in the body thus maintaining its high levels. The presence of progesterone prevents the maturation of another ovum, thus temporally stopping the menstrual cycle.
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संबंधित प्रश्न
List two functions ovary of human female reproductive system.
Where does a fertilised ovum develop into a baby in the human body?
What changes are seen in boys at the time of puberty?
Explain how the transmission of virus and bacteria diseases be prevented?
Describe in brief the role of seminal vesicle in human male reproductive system.
Identify the given diagram.
Name the parts 1 to 5. 
Rewrite the following terms in a correct and logical sequence:
The luteal phase, follicular phase, menstrual phase, ovulatory phase.
Explain the term Parturition or birth.
Given below is a group of terms. In the group, one pair indicates the relationship between the two terms. Rewrite and complete the second pair on a similar basis.
Female gonad : Ovaries :: Male gonad : ______.
