Biology 12th Class Question Bank : part 2

                                         Sheet - 2 

1. Write about the four phases in  menstrual cycle and also explain the hormonal control of  this period .
2. Write the four way to transfer pollen grain on stigma ?
3. Explain industrial melanism .
4.  Explain Mendel law of independent assortment .
5.  Write the difference between GIFT & ZIFT .
6.  Write the full form of ART .
7.  Explain Post fertilisation event .
8.  Explain law of co dominance .
9.  Explain down syndrome .
10.  Describe Griffith Experiment .
11.  Explain the process of PCR .
12.  Explain HIV process in detail.
13.  What do you mean by Air pollution ? write the causes of air pollution .
14.  Why CNG is better than diesel ?
15.  What is green house effect ?