Selina solutions concise biology class 8 icse Solutions for Chapter 3 reproduction in humans

Practice Question:

Define the term metamorphosis. Briefly describe the various stages occuring in the life cycle of a butterfly.

Practice Question:

What is fertilization? Describe the process in human beings.

Q1) How does a single called fertilized egg grows into an adult in human beings?

Practice Question:

Tabulate the important physical changes in the boys and girls that take place during puberty.

Q2) Describe the human female reproductive system with a labelled diagram.

Practice Question:

‘Adolescence is a crucial stage.’ Justify this statement.

Q1) Put a tick mark against the correct alternative in the following statements:

(a) The testes are located within the:

1. Penis

2. Scrotum

3. Ureter

4. Urinary bladder

(b) amoeba most commonly reproduces by:

1. Budding

2. Regeneration

3. Binary fission

4. Multiple fission

(c) identify the stage which is formed after the fertilisation of the egg by the sperm?

1. Ovule

2. Foetus

3. Embryo

4. Zygote

(d) internally, the uterus opens into _____________________________:

1. Urethra

2. Vagina

3. Oviduct

4. Vulva

(e) Which one of the following represents the correct sequence in the life history of a butterfly ?

1. Egg – Larva – Adult – Pupa

2. Egg – Pupa – Adult – Larva

3. Egg – Larva – Pupa – Adult

4. Egg – Pupa – Larva – Adult

Q1) Distinguish between the following pair of terms:

(a) Egg and sperms

(b) Sexual Reproduction and asexual reproduction

(c) Budding and Regeneration

Q2) Define the following terms:

(a) Fertilization

(b) Implantation

(c) Puberty

Q3) State the reason why testes lie outside the abdomen in a scrotum?

Q4) Why is it important that a very large number of sperms should be present in the semen?

Q5) List the structures in their correct sequence through which the sperms must pass from the time they are produced in the testes to the time they leave the urethra.

Q6) State the functions of the following:

(a) Ovary

(b) Testes

(c) Fallopian Tubes

(d) Seminal Vesicle

(e) Uterus

Q7) Given here is a section of the female reproductive system of human beings

(a) Name the parts labelled 1 to 4

(b) Name the part where fertilisation occurs in human beings.

Q8) Given alongside is a diagram of male reproductive system in humans. Label the parts indicated by numbers 1 to 5, and state their functions.