NCERT Class 12th Biology Solutions Chapter 16 – Environmental Issues

Question 1: What are the various constituents of domestic sewage? Discuss the effects of sewage discharge on a river. Answer: Domestic sewage is the waste originating from the kitchen, toilet, laundry, and other sources. It contains impurities such as suspended solid (sand, salt, clay), colloidal material (fecal matter, bacteria, plastic and cloth fiber), dissolved materials … Read more

NCERT Class 12th Biology Solutions Chapter 15 – Biodiversity and Conservation

Question 1: Name the three important components of biodiversity. Answer: Biodiversity is the variety of living forms present in various ecosystems. It includes variability among life forms from all sources including land, air, and water. Three important components of biodiversity are: (a) Genetic diversity (b) Species diversity (c) Ecosystem diversity Question 2: How do ecologists … Read more

NCERT Class 12th Biology Solutions Chapter 14 – Ecosystem

Question 1: Fill in the blanks. (a) Plants are called as_________ because they fix carbon dioxide. (b) In an ecosystem dominated by trees, the pyramid (of numbers) is _________ type. (c) In aquatic ecosystems, the limiting factor for the productivity is _________. (d) Common detritivores in our ecosystem are_________. (e) The major reservoir of carbon … Read more

NCERT Class 12th Biology Solutions Chapter9 – Strategies for Enhancement in Food Production

Question 1: Explain in brief the role of animal husbandry in human welfare. Answer: Animal husbandry deals with the scientific management of livestock. It includes various aspects such as feeding, breeding, and control diseases to raise the population of animal livestock. Animal husbandry usually includes animals such as cattle, pig, sheep, poultry, and fish which … Read more

NCERT Class 12th Biology Solutions Chapter 7 – Evolution

Question 1: Explain antibiotic resistance observed in bacteria in light of Darwinian selection theory. Answer: Darwinian selection theory states that individuals with favourable variations are better adapted than individuals with less favourable variation. It means that nature selects the individuals with useful variation as these individuals are better evolved to survive in the existing environment. … Read more