NCERT Solutions For Class 12 Biology Reproduction in Organisms QUESTIONS FROM TEXTBOOK SOLVED 1. Why is reproduction essential for organisms? Ans: Reproduction is the ability of living organisms to produce a young one similar to itself. It ensures continuity of a species generation after generation. Reproduction introduces variation in the organisms. Useful variations are … [Read more...]
NCERT Solutions For Class 12 Biology Environmental Issues
NCERT Solutions For Class 12 Biology Environmental Issues QUESTIONS FROM TEXTBOOK SOLVED 1. What are the various constituents of domestic sewage? Discuss the effects of sewage discharge on a river. Ans: Domestic sewage contains four kind of impurities: (i)Suspended solids: They are soil particles such as sand and silt. (ii)Colloidal particles: They are inorganic and … [Read more...]
NCERT Solutions For Class 12 Biology Biodiversity and Conservation
NCERT Solutions For Class 12 Biology Biodiversity and Conservation QUESTIONS FROM TEXTBOOK SOLVED 1.Name the three important components of biodiversity. Ans.Three components of biodiversity are: (a)Genetic diversity (b)Species diversity (c)Ecological diversity2.How do ecologists estimate the total number of species present in the world? Ans.Ecologists make a … [Read more...]
NCERT Solutions For Class 12 Biology Ecosystem
NCERT Solutions For Class 12 Biology Ecosystem QUESTIONS FROM TEXTBOOK SOLVED 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 … [Read more...]
NCERT Solutions For Class 12 Biology Organisms and Populations
NCERT Solutions For Class 12 Biology Organisms and Populations QUESTIONS FROM TEXTBOOK SOLVED 1. How is diapause different from hibernation? Ans. Diapause is a period of suspended growth or development occuring in many insects and other invertebrates during which metabolic activities are greatly reduced. On the other hand, hibernation is a sleep like state in which a few … [Read more...]
NCERT Solutions For Class 12 Biology Biotechnology and its Applications
NCERT Solutions For Class 12 Biology Biotechnology and its Applications QUESTIONS FROM TEXTBOOK SOLVED 1.Crystals of Bt toxin produced by some bacteria do not kill the bacteria themselves because - (a)bacteria are resistant to the toxin (b)toxin is immature; (c)toxin is inactive; (d)bacteria encloses toxin in a special sac. Ans. (c) Toxin is inactive.2. What are … [Read more...]
NCERT Solutions For Class 12 Biology Strategies for Enhancement in Food Production
NCERT Solutions For Class 12 Biology Strategies for Enhancement in Food Production QUESTIONS FROM TEXTBOOK SOLVED 1.Explain in brief the role of animal husbandry in human welfare. Ans.Animal husbandry deals with the caring, feeding and management of domesticated animals. It includes poultry, farming and fisheries. These animals are very useful for human beings … [Read more...]
NCERT Solutions For Class 12 Biology Human Health and Disease
NCERT Solutions For Class 12 Biology Human Health and Disease QUESTIONS FROM TEXTBOOK SOLVED 1.What are the various public health measures, which you would suggest as safeguard against infectious diseases? Ans. The various public health measures against infectious diseases includes the following - 1.Education - People should be educated about the infectious diseases so that … [Read more...]
NCERT Solutions For Class 12 Biology Evolution
NCERT Solutions For Class 12 Biology Evolution QUESTIONS FROM TEXTBOOK SOLVED 1.Explain antibiotic, resistance observed in bacteria in light of Darwinian selection theory. Ans. According to Darwin, environment selects organisms with favourable variations and these organisms are allowed to survive. When a bacterial population encounters a particular antibiotic, those … [Read more...]
NCERT Solutions For Class 12 Biology Molecular Basis of Inheritance
NCERT Solutions For Class 12 Biology Molecular Basis of Inheritance QUESTIONS FROM TEXTBOOK SOLVED 1.Group the following as nitrogenous bases and nucleosides: Adenine, Cytidine, Thymine, Guanosine, Uracil and Cytosine. Ans. Nitrogenous Bases - Adenine, Uracil and Cytosine, Thymine; Nucleosides - Cytidine, guanosine.2.If a double stranded DNA has 20 per cent of cytosine, … [Read more...]