Lakhmir singh solutions science class 8 Solutions for Chapter 9 reproduction in animals

Exercises in Chapter 9 reproduction in animals Grade 8

Exercise

Questions in Exercise

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

What is the name of the reproductive process?

(a) Which involves two parents?

(b) Which involves only one parent?

What is the name of the reproductive process?

(a) Which involves two parents?

(b) Which involves only one parent?

(a) Name two animals that reproduce sexually.

(b) Name two animals that reproduce asexually.

State whether human beings reproduce by sexual method or asexual method.

Which type of reproduction?

(a) Involves gametes?

(b) Does not involve gametes?

Give another term for a fertilized egg.

Name the process of the fusion of gametes?

Do all animals give birth to individuals like humans?

What is the other name of the sex cell?

What are the organs in humans which produce the gametes?

(a) What are the male gametes in humans called? (b)Name the Organ which produces male gametes

(a) What are the female gametes in humans called?

(b) Name the organs which produce female gametes.

Name the organs which produce sperms in humans?

Name the organs which produce egg (or ova) in humans?

What do the testes in a man produce?

What do the ovaries in a woman produce?

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

In which female reproductive organ does the embryo get embedded?

Which stage comes earlier in the development of a human baby from zygote: fetus or embryo?

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

Write the full name of IVF?

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

What type of fertilization takes place in a hen?

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

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

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

What type of fission takes place in Amoeba?

Name one animal each which reproduces :

(a) by binary fission, and

(b) by budding

Name the asexual method of reproduction:

(a) in Hydra, and

(b) in Amoeba

Name the technique which was used in producing ‘Dolly’ the sheep?

Name the parent sheep of which Dolly was a clone?

What are the two general methods of reproduction in organisms?

State whether the following statements are True or False:

(a) Each sperm is a single cell.

(b) A new human individual develops from a cell called gametes.

(d) A zygote is formed as a result of fertilization.

(e) External fertilization takes place in the frog.

(f) An embryo is made up of a single cell.

(g) Oviparous animals give birth to young ones.

(h) Internal fertilization takes place in hens.

(i) The hens give birth to chicks like human beings give birth to babies.

(j) Amoeba reproduces by budding.

(k) Binary fission is a method of asexual reproduction

(l) Fertilization is necessary even in asexual reproduction.

(m) Cloning is a sexual reproduction method in mammals

Fill in the following blanks with suitable words (a) The process of __________ ensure continuity of life on earth.

(b) The cells involved in sexual reproduction are called __________

(d) The process of fusion of gametes is called __________

(e) The other name of egg cell is __________

(f) A sperm is much __________ than an egg cell.

(g) In humans, one nature egg (or ovum) is released into oviduct every __________ by one of the ovaries.

(h) The egg-laying animals are called __________ animals.

(i) The cow is an animal whereas the ostrich is an animal.

(j) The change of the caterpillar into an adult silk moth is called __________

(k) The larva of the frog is called __________

(l) The two common methods of asexual reproduction in animals are __________ and

(m) Dolly, the sheep, was produced by the technique called __________

(a) What is the difference between asexual and sexual reproduction?

(b) Which of the following organisms reproduce by the sexual method and by asexual method? Amoeba, Cats, Humans, Birds, Hydra

What is meant by the terms of internal fertilization and external fertilization? Explain with examples?

Why do female frogs (or fish) lay hundreds of eggs?

What is meant by embryo? Can we identify the body features in an embryo?

Give two differences between a zygote and a fetus.

Describe the various steps involved in sexual reproduction in animals.

Draw a labeled diagram of the human male reproductive system in animals.

Define fetus. After how many weeks of development, a human embryo is said to become a fetus.

What is metamorphosis? Give two examples of metamorphosis

What is the difference between viviparous animals and oviparous animals?

Which of the following are viviparous animals and which of the following are oviparous animals?

Frog, Human being, Sparrow, Lizard, Cow, Dog, Hen, Fish, Butterfly, Cat

Give five examples each of the animals which develop

(a) inside the mother.

(b) inside eggs which the mother lays.

Explain how chicks are born. How much time does the embryo present in hen’s egg take to develop into a chick (when provided sufficient warmth)?

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Chapters in this book

Crop Production And Management

Microorganisms: Friends and Foe

Synthetic Fibres And Plastics

Materials: Metals and Non-Metals

Coal And Petroleum

Combustion And Flame

Conservation Of Plants And Animals

Cell Structure And Its Functions

Reproduction In Animals

Reaching The Age Of Adolescence

Force and Pressure

Friction

Sound

Chemical Effect Of Electric Current

Some Natural Phenomena

Light

Stars And The Solar System

Pollution Of Air And Water