List of top Questions asked in Bihar Board XII- 2024

Which of the following is not the reason for global warming?
Which of the following statements is incorrect about organic farming?
Which of the following statements is incorrect about temperature?
At which level is natural selection operated to evolve the desired traits?
When percentage of individuals of pre-reproductive, reproductive and post-reproductive phase is in decreasing order in the age pyramid of human population, it shows that population is
Which of the following reproduces once in a lifetime?
What was the reason for co-existence of five closely related species of warblers?
Name of Ramdeo Mishra is associated with which field of research?
HIV attacks on which of the following cells?
Going down of inorganic water soluble nutrients into the soil nutrients is called as
According to Robert May, how much is the global species diversity?
Biodiversity of India is what percentage of the total global species diversity?
What was the reason for extinction of more than 200 species of Cichlid fish in Lake Victoria?
Explain the following with examples: (i) Aldol condensation (ii) Cannizzaro's reaction
Write IUPAC names of the following compounds:
(i) CH₃-CH₂-COOH (ii) CH₂=COOH (iii) ClCH₂-COOH (iv) CH₃-CH=CH-COOH (v) CH₃-CO-CH₂-COOH
What is the use of alpha-1-antitrypsin?
Which of the following methods is used for the amplification of nucleic acid?
At what pH insecticidal protein synthesized by Bacillus thuringiensis becomes active?
RNA interference is utilized to prevent nematode infestation in tobacco plants. By which vector are nematode specific genes introduced?
How many varieties of Basmati rice are grown in India?
Which of the following organizations makes decision regarding the validity of GM research and the safety of introducing GM organisms?
Which is Rosenmund reduction?
How is a polypeptide bond formed?
Write the IUPAC names of the following compounds:
(i) \( \text{CH}_3\text{CH}_2\text{OH} \)
(ii) \( \text{CH}_3\text{CH}_2\text{CH}_2\text{OH} \)
What do you understand by rate of a reaction? What factors affect the rate of a reaction? Discuss.