List of top Biology Questions asked in Bihar Board XII

Which of the following terms is used for the population found in a particular area?
Which of the following is a marine fish?
In which of the following does vegetative propagation take place through tuber?
Which of the following is a biotic component of the ecosystem?
Which of the following is used to induce mutation in crop plants?
Where are woody lianas / climbers found?
Which of the following is a source of quinine?
By which of the following is water hyacinth pollinated?
On which of the following planets is there a possibility of life?
By which of the following bonds are the nucleotides of DNA attached?
Which of the following is an example of analogous organs?
In which of the following are male and female flowers found on the same plant?
Which of the following is related to pomiculture?
Sertoli cells are controlled by which of the following hormones?
Which of the following is an important factor in the formation of new species?
Which of the following is a soluble RNA?
Which of the following is the period between birth and death?
The opening of which of the following is known as blastopore?
Which of the following is a correct pair?
Which of the following cannot pass through placenta?
Which of the following is affected by SO$_2$ pollution?

Write short notes on the following: 
Chemical composition of DNA.

How is gene of interest amplified by using PCR?
Write brief notes on the following:
Autogamy
Write short notes on the following:
Allergy