Lakhmir Singh & Manjit Kaur: Reproduction In Animals- 1 | Lakhmir Singh & Manjit Kaur Solutions: Class 8 Science PDF Download

Q.1. Which life process ensures that a plant of animal species will not disappear from the earth?

Reproduction is an important life process which ensures that a plant or animal species does not disappear from this earth.

Q.2. What is the name of the reproductive process :
(a) Which involves two parents ?
(b) which involves only one parents ?

(a) In sexual reproduction, two parents are involved.
(b) In asexual reproduction, only one parent is involved.

Q.3. 
(A) Name two animals which reproduce sexually.

Cows and dogs are reproduce sexually.

(B) Name two animals which reproduce asexually.

Hydra and planaria reproduce by asexually.

Q.4. State whether human beings reproduce by sexual method of asexual method.

Human beings reproduce by sexual method.

Q.5. Which type of reproduction :
(a) involves gametes ?
(b) does not involve gametes ?

(a) Sexual reproduction involves gametes.
(b) Asexual reproduction does not involve gametes.

Q.6. Give another term for a fertilized egg.

The another term for a fertilized egg is zygote.

Q.7. Name the process of the fusion of gametes ?

The process by which male and female gametes fuse to each other is called fertilization.

Q.8. Do all animals give birth to individuals like humans ?

No. All organisms do not give birth to individuals like humans.

Q.9. What is the other name of sex cell ?

Sex cells are also known as gametes.

Q.10. What is the organs in humans which produces the gametes ?

In humans, testes (in male) and ovaries (in female) are reproductive organ which produces the gametes.

Q.11.
(A) What are the male gametes in humans called ?

The male gametes in human are called sperms.

(B) Name the Organ which produce male gametes.

Testes produce male gametes called sperms.

Q12.
(A) What are the female gametes in human called ?

The female sex cells (gametes) in humans are called eggs.

(B) Name the organs which produce female gametes.

Ovary produces female sex cells called eggs.

Q.13. Name the organs which produces sperms in humans.

Testes produce male gametes (sperms) in humans.

Q.14. Name the organs which produce egg (or ova) in humans.

Ovaries produce egg (or ova) in humans.

Q.15. What do the testes in a man produces ?

Testes in a man produce male gametes called sperms.

Q.16. What do the ovaries in a women produce ?

Ovaries in a woman produce female gametes called eggs.

Q.17. Which organ of the human body passes sperms from a man to a woman ?

Penis is an organ which passes the sperms from the man’s body into the vagina in the women’s body during mating.

Q.18. In which female reproductive organ does the embryo get embedded ?

The embryo gets embedded in the wall of the uterus for further development.

Q.19. Which stage comes earlier in the development of a human baby from zygote : foetus or embryo ?

Embryo stage comes earlier in the development of a human baby from zygote.

Q.20. Name the technique which is used to help a woman with blocked oviducts to have a baby.

In vitro fertilization (IVF) technique is used to help a woman with blocked oviducts to have a baby.

Q.21. Write the full name of IVF.

The full name of IVF is in vitro fertilization (fertilization outside the body).

Q.22. What is the success rate of IVF technique of reproduction in humans?

The success rate of IVF technique is only about 30 to 40 percent.

Q.23. What type of fertilization takes place in a hen ?

Internal fertilization takes place in a hen.

Q.24. What term is used for the following ?
The change from tadpole to frog.

The transformation of the larva (tadpole) into an adult (frog) through drastic changes is called metamorphosis.

Q.25. Name two animals which produce embryos that grow into larvae before transforming into adults.

Frog and silk moth produce embryos that grow into larvae before transforming into adults.

Q.26. What term is used for ‘bulges’ observed on the sides of the body of Hydra ?

These bulges are the developing new individuals and they are called buds.

Q.27. What type of fission takes place in Amoeba ?

Binary fission takes place in Amoeba.

Q.28. Name one animal each which reproduces :
(a) by binary fission, and
(b) by budding.

(a) Amoeba reproduces by common asexual method called binary fission.
(b) Budding is asexual method of reproduction in hydra.

Q.29. Name the asexual method of reproduction :
(a) in Hydra, and (b) in Amoeba.

(a) Hydra reproduce by asexual method called budding.

(b) Amoeba reproduce by binary fission, a asexual method.

Q.30. Name the technique which was used in producing ‘Dolly’ the sheep.

Cloning is the technique which was used in producing ‘Dolly’ the sheep.