Sexual Reproduction in Humans Class-8th Goyal Brothers Biology Solutions

Sexual Reproduction in Humans Class-8th Goyal Brothers ICSE Biology Solutions Chapter-2 (Reproduction in plants and animals), Unit-3. We Provide Step by Step Answer of Objective, Fill in the blanks , Definitions , Match the followings and Short/Long Question Type answers of Chapter-2, Unit-3, Sexual Reproduction in Humans. Visit official Website CISCE for detail information about ICSE Board Class-8

Sexual Reproduction in Humans Goyal Brothers

ICSE Class-8th Biology Solutions Chapter-2,Unit-3

Board	ICSE
Class	8th
Subject	Biology
Book Name	Goyal Brothers
Chapter-2	Reproduction in plants and animals
Unit-3	Sexual Reproduction in Humans
Topic	Solution of exercise questions
Session	2023-24

Sexual Reproduction in Humans

ICSE Class-8th Goyal Brothers

I. Multiple choice questions. Tick (√ ) the correct choice :

1. Testis are present in a sac called __.

(a) scrotum (b) oviduct (c) epididymis (d) none of the above

Answers: (a) Scrotum

2. Which of the following is not a part of female reproductive system?

(a) vagina (b) ovary (c) testis (d) uterus

Answers: (a) Testis

II. Fill in the blanks :

Lower part of uterus is called _Cervix_.
The sac-like structure present outside the body and which contains testes is called _Scrotum_.
Male gametes are produced inside _Testes_.
Development of a baby (foetus) takes place inside _Uterus_.
The time between fertilisation and birth is called _Gestation_.

III. Find the odd one out, giving reason :

Testes, epididymis, uterus, vas deferens :- It is the female reproductive system rest of the three are the male reproductive system.
Ovary, scrotum, ovum, uterus :- It is the male reproductive part where all others are female reproductive parts .

IV. Differentiate between the following :

1. Sperm and Ovum

Sperm	Ovum
1. It is male gamete	1. It is female gamete
2. Sperm is the smallest cell in human body.	2. It is one of the largest cells in the human body
3. It is produced from testes	3.It is produced from ovary
4. A sperm cell is surrounded by a plasma membrane.	4. An ovum cell is surrounded by egg envelopes.

2. Epididymis and vas deferens

Epididymis	Vas deferens
1. It is located at the back of the testis and connects it to the vas deferens.	1. It is a sperm duct through which sperms leave the testes and reach the urethra.
2. It is the place where sperms are stored after they mature	2. It transports mature sperm to the urethra in preparation for ejaculation.
3. It stores sperm	3. It Collect mature sperms from epididymis
4. This found on the top of the testis.	4. It is present in the form of one single duct on the side of each testis

V. Mention the functions of the following :

1. Testis: Male gamete or sperm are produced in an organ called testis.

Functions:

It produces sperm.
It acts as an endocrine gland.
It secrets male sex hormones called testosterone.

2. Ovary: The female reproductive organ that produces the egg cells is known as the ovary.

Functions:

They produce eggs for fertilization.
They produce the reproductive hormones estrogen and progesterone
They produce the ovum and secrete female sex hormones.

3. Uterus: A uterus also called the womb, is a muscular, inverted pear-shaped organ of the female reproductive system.

Functions:

It provide nourishment and a conducive environment for the developing foetus.
Uterus stretches to grow baby during pregnancy.
Uterine lining is where blood and tissue come from during menstruation.

4. Oviduct: In women it is a paired organ that is essential for fertility.

Functions:

It transports the embryo to the uterus
The fertilized embryo migrates to the uterus within 3-5 days
Sperm and ovum meet here and fertilisation takes place.

5. Vagina: Cervix is connected to the muscular tube-like vagina.

Functions:

It plays an important role in the outlet of menstrual flow.
It serves as the birth canal through which the baby is delivered.
It takes menstrual flow outside the body.

VI. Answer the following questions :

1. Which part of the human body produces

(a) Sperms

Answer: Testis.

(b) Ova

Answer: Ovaries

2. Name the organ involved in the following :

(a) Fertilisation of ovum by the sperm:

Answer: Fallopian tube

(b) Passing of sperms from a man to a woman.

Answer: Penis

3. Describe the male and female reproductive systems in humans.

Answer: Organs of male reproductive system includes-

A pair of testes (singular testis) in the scrotal sac, produce male gametes or sperms.
Epididymis stores sperms, found on the top of the testes.
Vas deferens- Sperm duct through which sperms leave the testes, open into urethra and reach penis.
Penis- it is used for injecting sperms inside the body of the female.

Organs of female reproductive system includes-

A pair of ovaries(singular ovary)- produces eggs(ova)
Oviducts or fallopian tubes through which eggs travel.
uterus also known as womb
Vagina- The sperm enters the uterus through it.

4. Define

Implantation: Fertilisation takes place inside the female’s body in the oviduct. After fertilisation, the fertilised eggs attaches itself to the womb’s(uterus) lining. The process is called implantation.
Gestation: The time between the fertilisation and birth is called pregnancy or gestation. It lasts for 9 months or 280 days.