HARD
12th CBSE
IMPORTANT
Earn 100

Explain the hormonal regulation of the process of spermatogenesis in human.

Important Questions on Human Reproduction

HARD
12th CBSE
IMPORTANT
Briefly explain the events of fertilisation and implantation in an adult human female.
HARD
12th CBSE
IMPORTANT
Comment on the role of the placenta as an endocrine gland.
MEDIUM
12th CBSE
IMPORTANT
(a) Arrange the following hormones in the sequence of their secretion in a pregnant woman.
(b) Mention their source and the function they perform hCG, LH, FSH, Relaxin.
MEDIUM
12th CBSE
IMPORTANT
(a) Explain the following phases in the menstrual cycle of a human female.
     (i) Menstrual phase; (ii) Follicular phase; (iii) Luteal phase
(b) A proper understanding of the menstrual cycle can help immensely in family planning. Do you agree with this statement? Provide reasons for your answer.
EASY
12th CBSE
IMPORTANT
Medically, it is advised to all your mothers that breastfeeding is the best for their newborn babies. Do you agree? Give reason in support of your answer.
EASY
12th CBSE
IMPORTANT

Rashmi gave birth to three girls. Her mother-in-law blamed her for giving birth to girls. However, as we know, ova (eggs) are only of one type containing 22+X chromosomes, but sperms are of two types: one type of sperms contain 22+X chromosomes and another type of sperms contain 22+Y chromosomes. When ovum and sperm with 22+Y chromosomes are fused, a male child is formed and when ovum and sperm with 22+X chromosomes are fused, a girl child is produced.

Read the above passage and answer the following question:

In your opinion, who is responsible for the female child (mother or father)?

EASY
12th CBSE
IMPORTANT

Rashmi gave birth to three girls. Her mother-in-law blamed her for giving birth to girls. However, as we know, ova (eggs) are only of one type containing 22+X chromosomes, but sperms are of two types: one type of sperms contain 22+X chromosomes and another type of sperms contain 22+Y chromosomes. When ovum and sperm with 22+Y chromosomes are fused, a male child is formed and when ovum and sperm with 22+X chromosomes are fused, a girl child is produced.

Read the above passage and answer the following question:

How many types of sperms are produced? (Write in words)

EASY
12th CBSE
IMPORTANT

Rashmi gave birth to three girls. Her mother-in-law blamed her for giving birth to girls. However, as we know, ova (eggs) are only of one type containing 22+X chromosomes, but sperms are of two types: one type of sperms contain 22+X chromosomes and another type of sperms contain 22+Y chromosomes. When ovum and sperm with 22+Y chromosomes are fused, a male child is formed and when ovum and sperm with 22+X chromosomes are fused, a girl child is produced.

Read the above passage and answer the following question:

Penetration of which type of sperm into the ovum produces a male child.