NCERT Class 12 Biology: Chapter –3 Human Reproduction Part 3

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Question 18:

Identify the odd one from the following:

a. Labia minora

b. Fimbriae

c. Infundibulum

d. Isthmus

Answer: (a)

Very Short Answer Type Questions

Question 1:

Given below are the events in human reproduction. Write them in correct sequential order. Insemination, gametogenesis, fertilisation, parturition, gestation, implantation

Answer:

Question 2:

The path of sperm transport is given below. Provide the missing steps in blank boxes.

The path of sperm transport

The Path of Sperm Transport

Answer:

The path of sperm transport

The Path of Sperm Transport

Question 3:

What is the role of cervix in the human female reproductive system?

Answer:

Cervix is the part of female reproductive system that connects uterus to womb. Cervix has the following roles including:

1. It allows the passage of sperm.

2. It also acts as a reservoir for the sperm.

3. It prevents the entry of bacteria into the uterus during pregnancy.

4. It forms the birth canal during parturition.

Question 4:

Why are menstrual cycles absent during pregnancy?

Answer:

Once a woman gets pregnant, the placenta starts producing Human Gonadotropin Hormone (hCG). This hormone starts developing Corpus Luteum that secretes a hormone called progesterone which maintains the thickness of the endometrium lining and prevents it from shedding. High level of oestrogen and progesterone during pregnancy results in the absence of menstrual cycle.

Question 5:

Female reproductive organs and associated functions are given below in column A and B. Fill the blank boxes.

Female reproductive organs and associated functions

Female Reproductive Organs and Associated Functions

Answer:

Female reproductive organs and associated functions

Female Reproductive Organs and Associated Functions

Question 6:

From where the parturition signals arise-mother or foetus? Mention the main hormone involved in parturition.

Answer:

Parturition is a term that is used to describe the delivery of baby and placenta from mother’s uterus to the outside world. The signals of parturition arise from the foetus. Oxytocin is the principal (main) hormone involved in parturition.

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