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Question

Indicate whether the following statements are true or false.​
(1) Oviparous animals give birth ​to young ones.
(2) Each sperm is a single cell.
(3) External fertilisation takes place in frog.
(4) A new human individual develops ​from a cell called gamete.​
(5) Egg laid after fertilisation is made up of ​a single cell.
(6) Amoeba reproduces by budding.
(7) Fertilisation is necessary even in ​asexual reproduction.
(8) Binary fission is a method of ​asexual reproduction.
(9) A zygote is formed as a result of ​fertilisation.​
(10) An embryo is made up of a single cell.

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Solution

(1) False
The given statement is false.​
Oviparous animals are those animals that lay eggs while viviparous animals give birth to their young ones. ​

(2) True
The given statement is true.​
Sperm is a single cell which has three parts- head, middle piece and tail. ​

(3) True
The given statement is true.​
Fertilisation is external in frogs as the female lays egg which is then fertilised by the sperms of the frog. Embryo development also takes place externally.​

(4) False
The given statement is false.​
Gametes are the reproductive cells produced in male and female reproductive organs. ​
By the processes of fertilisation, fusion of male and female gamete takes place to form a single celled zygote that develops into a new organism. ​

(5) True
The given statement is true.​
Animals that lay eggs are called oviparous.​
In oviparous animals, fertilisation takes place internally and development of embryo takes place externally. The fertilized egg is a single cells that is laid and develops into an embryo.​

(6) False
The given statement is false.​
Amoeba is an unicellular organism that reproduces by the process of binary fission, while budding is seen in organisms like hydra. ​

(7) False
The given statement is false.​
Fertilisation is process of fusion of gametes to form a single celled zygote. This is a crucial step in sexual reproduction. ​
In asexual reproduction, there is no formation and fusion of gametes. ​

(8) True
The given statement is true.​
Binary fission is a type of asexual reproduction seen in amoeba, where a single parent amoeba undergoes series of changes and splits into two two daughter cells. ​

(9) True
The given statement is true.​
Fertilisation is the process of fusion of male and female gametes resulting in the formation of single cell zygote.

(10) False
The given statement is false.​
Zygote is single celled structure formed as a result of fusion of the sperm and egg. ​
Zygote divides to form a multicellular stage, that further develops into an embryo. ​

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