Class 12 Biology

Question 1: What are the various constituents of domestic sewage? Discuss the effects of sewage discharge on a river. Answer: … Read more

Question 1: Name the three important components of biodiversity. Answer: Biodiversity is the variety of living forms present in various … Read more

Question 1: Fill in the blanks. (a) Plants are called as_________ because they fix carbon dioxide. (b) In an ecosystem … Read more

Question 1: How is diapause different from hibernation? Answer: Diapause is a stage of suspended development to cope with unfavourable … Read more

Question 1: Crystals of Bt toxin produced by some bacteria do not kill the bacteria themselves because − (a) bacteria … Read more

Question 1: Bacteria cannot be seen with the naked eyes, but these can be seen with the help of a … Read more

Question 1: Explain in brief the role of animal husbandry in human welfare. Answer: Animal husbandry deals with the scientific … Read more

Question 1: What are the various public health measures, which you would suggest as safeguard against infectious diseases? Answer: Public … Read more

Question 1: Explain antibiotic resistance observed in bacteria in light of Darwinian selection theory. Answer: Darwinian selection theory states that … Read more

Question 1: Group the following as nitrogenous bases and nucleosides: Adenine, Cytidine, Thymine, Guanosine, Uracil and Cytosine. Answer: Nitrogenous bases … Read more