Page 103 - Science Class 08

1. What is scrotal sac?
2. Name the parts of a human sperm.
3. What is semen?
4. Which organ in female produce eggs?
5. What is embryo?
6. Where does the fer lisa on take place in a hen?
7. Name any two viviparous animals.

Reproduction : The process of giving birth to young ones

Gamete : Reproductive cell
Sperm : Male gamete
Ovum : Female gamete

Zygote : The third cell formed by the fusion of sperm and ovum
Embryo : Fertilised egg that divides many times to form a cell ball
Fertilisation : The process of fusion of the sperm and ovum

Internal fertilisation : Fertilisation that takes place inside the body
External fertilisation : Fertilisation that takes place out side the body

Uterus : A big womb where the fertilised egg develops
Viviparous animals : Animals that give birth to their babies
Oviparous animals : Animals that lay eggs
Asexual reproduction : A method of reproduction in which only a single parent is involved

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i Reproduction ensures continuity of life on the earth.
i Producing young ones of their own kind by all living beings is called reproduction.
i There are two methods of reproduction namely sexual reproduction and asexual
reproduction.

i In sexual reproduction two parents one male and the other female of the same species are
required.
i Some multicellular organisms have both male and female sex organs, these organisms are
called bisexual organisms.
i Some multicellular organisms have either male sex organ or female sex organ, these
organisms are called unisexual organisms.
i There are two kinds of fertilisation namely external fertilisation and internal fertilisation.

Science-8 103