What do you mean by binary fission? Draw a diagram also.


Binary fission is a method of asexual reproduction. In this method the body of the animal divides into two halves. The nucleus of the body divides into two and this is followed by the division of the whole body So, two organisms get produced with separate nuclei. Animals like Amoeba reproduce by this method.


Binary fission is a method of asexual reproduction. In this method th

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What do you mean by test-tube baby?


Babies born through the technique of in vitro fertiliztion are called test-tube babies. In in vitro fertilisation, freshly released egg and sperms are collected and kept together for a few hours in a test tube for fertilization. After fertilization , the zygote formed is allowed to develop for a week and then is placed inside the mother's uterus where further development takes place. 

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What is fertilization? Explain how many types of fertilizations are there?


Fertilizations  is the fusion of male and female gamete to form zygote. There are two types of fertilization :
i. Internal fertilization - is the fertilization in which the male releases his sperms into the body of the female and fertilization takes place inside the female body. For example fertilization in human beings.
ii. External fertilization - is when the male and female release their gametes out in open and fertilization occurs outside the female body. For example -fertilization in frog and fish.

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What is budding? Draw the diagram also.


Budding is an asexual method of reproduction in animals. It needs only a single parent to reproduce. The body of the animal starts developing a small bulging structure called bud which slowly grows and have itself disconnected from the parent animal and becomes a separate individual. This is called budding. Animals like hydra reproduce through budding.


Budding is an asexual method of reproduction in animals. It needs onl

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Explain how external fertilization takes place?


In external fertilization, the females lays hundreds of eggs outside in places like streams. The eggs are kept together and protected by a layer of jelly. The male deposits sperms over the eggs resulting in the fertilization. 

 

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