REPRODUCTION IN ANIMALS CLASS 8 PDF DOWNLOAD

NCERT Solutions for Class 8th: Ch 9 Reproduction in Animals Science. Page No: Excercise 1. Explain the importance of reproduction in organisms. Free PDF download of NCERT Solutions for Class 8 Science (Biology) Chapter 9 - Reproduction in Animals solved by Expert Teachers as per NCERT (CBSE). In animals, males and females have different reproductive parts or organs. The reproductive parts in animals produce gametes that fuse to form a zygote. It is the zygote which develops into a new individual. This type of reproduction beginning from the fusion of male and female gametes is called sexual reproduction.


REPRODUCTION IN ANIMALS CLASS 8 PDF DOWNLOAD

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REPRODUCTION IN ANIMALS CLASS 8 PDF DOWNLOAD


Reproduction is termed to be a biological process in which organisms give birth to their off springs. It helps in maintaining the continuity of particular race and helps in increasing the population of the species.

Reproduction is meant for survival of all living things. Fertilization is defined as the process in which there is a fusion of male gamete and female gamete.

REPRODUCTION IN ANIMALS CLASS 8 PDF DOWNLOAD

The male gametes or sperms are released from the male reproductive organ called penis The sperms released enter the female body through the vagina. From vagina, sperms travel through the fallopian tubes where they meet the eggs.

NCERT Solutions for Class 8th: Ch 9 Reproduction in Animals Science

From there on, the process of fertilization takes place in the reproduction in animals class 8 tube. The male gamete cell sperm and female gamete cell egg fuse together to form a zygote. The zygote divides rapidly to form a group of cells called morula, which becomes the embryo after approximately five days.

The fetus is present about eight weeks after the fertilization takes place.

Reproduction in Animals - Class 8 : Notes -

Internal fertilization is the process of fusion of sperm and an egg cell during sexual reproduction inside the body. Tadpole into an adult frog. The zygote has two nuclei since it is formed by the combination of a sperm and an reproduction in animals class 8. It is the earliest stage of development It is formed by the fusion of male and female gametes It is a single cell Zygote divides several times to form an embryo The zygote normally lasts a week and then develop into its reproduction in animals class 8 stage.

Reproduction in Animals NCERT Solutions - Class 8 Science

Fetus It is the last developmental stage of an organism The stage of the embryo that shows all the main recognizable body parts of a mature organism.

Millions of male gametes sperms are produced by the testes.

Though sperms are very small in size, each has a head, a middle piece and a tail. Sperm is a single cell with all the usual cell components. A pair of ovaries, oviducts Fallopian tubes and the uterus, these are the female reproductive organs. Ovary produces reproduction in animals class 8 gametes called ova eggs.

In human beings, a single matured egg is released by one of the ovaries, into the oviduct every month.

Reproduction in Animals - Class 8 : Notes

Uterus is the part where development of the baby takes place. An egg is also a single cell. The process of fertilization is fusion of a male gamete Sperm with a female gamete Ovum is called fertilization. Zygote is formed after fertilization.

NCERT Solutions for Class 8th: Ch 9 Reproduction in Animals Science « Study Rankers

There are two types of fertilization in animals, external fertilization and internal fertilization. Reproduction in animals class 8 fertilization occurs in many animals including humans, cows, dogs and hens.

It is very common in aquatic animals such as fish, starfish, etc. During spring or rainy season, frogs and toads move to ponds and river. When the male and female come together in water, the female lays the eggs, the male deposits sperms over them.

REPRODUCTION IN ANIMALS CLASS 8 PDF DOWNLOAD

Each sperm swims randomly in water with the help of its long tail. The sperms then come in contact with the eggs. Eggs of frog Development of Embryo: Development of embryo takes place in the female reproductive system through following steps:



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