Chapter 9: Strategies for Enhancement in Food Production
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…
Chapter 9: Biomolecules
NCRT TEXTBOOK QUESTIONS SOLVED 1. What are macromolecules? Give examples.Solution: Macromolecules are large high molecular weight substances with complex molecular structure and occur in colloidal state (being insoluble) in intracellular fluid. These are formed by polymerization of large…
Chapter 8: Human Health and Disease
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…
Chapter 8: Cell The Unit of Life
NCRT TEXTBOOK QUESTIONS SOLVED 1.Which of the following is not correct?(a) Robert Brown discovered the cell.(b) Schleiden and Schwann formulated the cell theory.(c) Virchow explained that cells are formed from pre-existing cells.(d) A unicellular organism carries out…
Chapter 7: Evolution
Evolution Chapter Class 12 NCERT Q1. 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…
Chapter 7: Structural Organisation in Animals
1. Answer in one word or one line.(i) Give the common name of Periplaneta americana.(ii) How many spermathecae are found in earthworm?(iii) What is the position of ovaries in cockroach?(iv) How many segments are present in the…
Chapter 6: Molecular Basis of Inheritance
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…
Chapter 6: Anatomy of Flowering Plants
1.State the location and function of different types of meristems.Soln. Meristems are of three types on the basis of their location in plant body:(i) Apical meristem: It is present at the apices of root and shoot and is…
Chapter 5: Principles of Inheritance and Variation
1.Mention the advantages of selecting pea plant for experiment by MendelAns: Mendel select garden pea (Pisum Sativum) for the following reasons.(i) It is an annual plant with short life span and gives results within 3 months.(ii) The plant…
Chapter 5: Morphology of Flowering Plants
1.What is meant by modification of root? What type of modification of root is found in the:(a) Banyan tree(b) Turnip(c) Mangrove treesSoln.Roots of some plants change their shape and structure and become modified to perform certain functions…
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