List of top Biology Questions asked in Bihar Board Class XII

How is gene of interest amplified by using PCR?
Answer the following questions:
(A) Stability of DNA is higher than that of RNA. How?
(B) What are the roles of the three parts of the transcription unit?
Describe the structure of microsporangium.
Explain double fertilization.
Explain the causes of biodiversity loss.
Write short notes on the following:
Primary immunity
What are spermatogonia, primary spermatocytes and secondary spermatocytes?
How is the name given to restriction endonucleases?
What are contraceptive pills? How do they function?
Write short notes on the following:
Phosphorus cycle
What is cell mediated immunity?
What is cyclosporin-A and what is its use?
What are the primary and secondary productivities?
How are DNA fragments separated and isolated?
What are the factors which affect population growth?
Explain parasitic adaptations.
What is ELISA?
What is Dobson unit?
What is MOET?
What is the population growth rate of India as per 2001 census?
Name the different species of Plasmodium. Which species is responsible for malignant malaria?
Which of the following IUDs is hormone releasing?
What is incomplete dominance?
What is the relationship between thorns of Bougainvillea and tendrils of Cucurbita?
What would be the blood group of offspring, if the blood group of mother is AB and blood group of father is O?