Q2 of 16 Page 136

Fill in the blanks with suitable words :

Variations caused by sudden genetic changes are called __________.

Variations caused by sudden genetic changes are called Mutations.

Explanation: The concept of mutation was given by Hugo De Vries in 1902. According to him, variations are changes in the genetic constitution of same species arise due to sudden changes in the genetic makeup. He termed those variations caused by sudden genetic changes as mutations.


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Fill in the blanks with suitable words :

Earth was a hot revolving ball of________ about 4.6 billions of years ago.

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Fill in the blanks with suitable words :

Lightest element hydrogen was found in the ____________ layer of the earliest earth.

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Fill in the blanks with suitable words :

Darwin explained the survival of the fittest, but not their__________.

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Match the following :