Reproduction in animals for class 8 | worksheet
Download Reproduction in animals class 8 worksheet based on the latest CBSE syllabus including MCQ Type questions, reproduction in animals, human reproductive system, diagram-based question, long questions and answer, and more.
There are two modes by which animals reproduce. These are (i) Sexual reproduction, and (ii) Asexual reproduction.
the reproductive parts in animals also produce gametes that fuse to form a zygote. It is the zygote that develops into a new individual. This type of reproduction beginning from the fusion of male and female gametes is called sexual reproduction.
The male reproductive organs include a pair of testes (singular, testis), two sperm ducts and a penis. The testes produce the male gametes called sperms. Millions of sperms are produced by the testes.
The female reproductive organs are a pair of ovaries, oviducts (fallopian tubes) and the uterus.
The first step in the process of reproduction is the fusion of a sperm and an ovum. When sperms come in contact with an egg, one of the sperms may fuse with the egg. Such fusion of the egg and the sperm is called fertilisation. During fertilisation, the nuclei of the sperm and the egg fuse to form a single nucleus. This results in the formation of a fertilised egg or zygote.
Fertilisation which takes place inside the female body is called internal fertilisation. Internal fertilisation occurs in many animals including humans, cows, dogs and hens.
fertilisation in which the fusion of a male and a female gamete takes place outside the body of the female is called external fertilisation. It is very common in aquatic animals such as fish, starfish, etc.
The animals which give birth to young ones are called viviparous animals. Those animals which lay eggs are called oviparous animals.
The transformation of the larva into an adult through drastic changes is called metamorphosis.
In each hydra, there may be one or more bulges. These bulges are the developing new individuals and they are called buds. Recall the presence of buds in yeast. In hydra too the new individuals develop as outgrowths from a single parent. This type of reproduction in which only a single parent is involved is called asexual reproduction.