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Thursday, December 18, 2014

REPRODUCTION IN ANIMALS CHAPTER 9 CLASS 8TH

IMPORTANT KEYWORDS

Reproduction- It is the one of the important life process, which ensures the continuation of similar kinds of individuals generation after generation.

Sperms- the testes produce the male gametes called sperms.

Ova- Ovary produces females gametes called ova.

Uterus- It is the part of female reproductive system where development of embryo take place.

Fertilisation- The fusion of male gametes (sperms) and female gametes( ovum) is called fertilisation.

Zygote- During fertilisation the nuclei of the sperms and the egg are fused to form a single nucleus. This fertilised egg is called zygote.

Embroyo- The zygote divides repeatedly to give rise to a ball of cells. The cells begins to differentiate into various tissues. This developing structure is called an embryo.

Foetus-  The stage of the embryo in which all parts of the body are identifiable is known as foetus.

Bud- The outgrowth from the parent body that assumes the shape of the parent is called bud.

Binary fission-Amoeba reproduce by dividing into two. This type of asexual reproduction is called binary fission.

Sexual  reproduction- The reproduction resulting from the fusion of male gamete and female gamete is called sexual reproduction.

Internal fertilization- Fertilisation that take place inside the female body is called internal fertilisation.

External fertilisation- Fertilisation that take place outside the female body is called external fertilisation.

Oviparous- Animals which lay eggs are called oviparous.

Viviparous- Animals which give birth to young ones are called viviparous.

Budding- In this type of reproduction a bud arises from the parent body and as it matures it detaches itself from parent body to give rise to new organisms.

Metamorphosis- When a larva tranforms in adult through drastic changes is called metamorphosis.






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