Q2 of 30 Page 1

Mention any one harmful effect of chlorofluorocarbons (CFCs) on our environment.

One of the most harmful effect of chlorofluorocarbons (CFCs) on our environment is the ozone layer depletion due to its destructive nature on ozone layer. CFC converts ozone (O3) layer into free oxygen, thus allowing harmful rays of sun enter the atmosphere.


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1

How many megaspore mother cells will produce 24 embryo sacs?

 3

Give any example where human actions have resulted in organic evolution.

 4

Name the molecules that form the backbone of the polynucleotide chains of DNA.

 5

Why is the thermostable Taq polymerase enzyme essential in carrying out polymerase chain reaction (PCR) and not DNA polymerase?