NCERT Solutions Class 12 Biology Chapter 9 Strategies for Enhancement in Food Production

Question. Explain in brief the role of animal husbandry in human welfare. Answer. Animal husbandry is the practice of taking care and breeding domestic animals by applying scientific principles. It includes feeding, breeding and raising animal livestock whose primary…

NCERT Solutions Class 12 Biology Chapter 8 Human Health and Disease

Question. What are the various public health measures which you would suggest as safeguard against infectious disease? Answer. The common preventive measures are as follows: (i) Education: People should be educated about communicable diseases to protect themselves…

NCERT Solutions Class 12 Biology Chapter 7 Evolution

Question. Explain antibiotic resistance observed in bacteria in light of Darwinian selection theory. Answer. Darwinian theory of natural selection states that environment selects organisms with favourable variation and these organisms thus survive and reproduce. It is…

NCERT Solutions Class 12 Biology Chapter 6 Molecular Basis of Inheritance

Question. Group the following as nitrogenous bases and nucleosides: Adenine, Cytidine, Thymine, Guanosine, Uracil and Cytosine. Answer. Nitrogenous bases—Adenine, Thymine, Uracil and Cytosine. Nucleosides—Cytidine and Guanosine. Question. If a double stranded DNA has 20 per…

NCERT Solutions Class 12 Biology Chapter 5 Principles of Inheritance and Variation

Question. Mention the advantages of selecting pea plant for experiment by Mendel. Answer. Mendel selected garden pea as his experimental material because of the following reasons: (i) It is an annual plant with a short life-cycle. So, several generations can be studied…

NCERT Solutions Class 12 Biology Chapter 4 Reproductive Health

Question. What do you think is the significance of reproductive health in a society? Answer. In a society, if people are aware of birth control methods to avoid sexually transmitted diseases and the importance of breast feeding and post-natal care of the mother and baby,…

NCERT Solutions Class 12 Biology Chapter 2 Sexual Reproduction in Flowering Plants

Question. Name the parts of an angiosperm flower in which development of male and female gametophyte take place. Answer. Development of male and female gametophytes takes place in anther and ovary, respectively Question. Differentiate between microsporogenesis and…

NCERT Solutions Class 12 Biology Chapter 16 Environmental Issues

Question. What are the various constituents of domestic sewage? Discuss the effects of sewage discharge on a river. Answer. The various constituents of domestic sewage are: (i) Suspended solids: Grit made up of sand, silt and clay. (ii) Colloidal materials: Including…

NCERT Solutions Class 12 Biology Chapter 15 Biodiversity and Conservation

Question. Name the three important components of biodiversity. Answer. The three important components of biodiversity are: genetic diversity, species diversity and ecological diversity. Question. How do ecologists estimate the total number of species present in the world?…

NCERT Solutions Class 12 Biology Chapter 14 Ecosystem

Question. 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…

NCERT Solutions Class 12 Biology Chapter 13 Organisms and Populations

Question. How is diapause different from hibernation? Answer. Differences between hibernation and diapause Hibernation Diapause Under unfavourable conditions, the animals that fail to migrate, avoid the stress by escaping in time and showing winter…

NCERT Solutions Class 12 Biology Chapter 12 Biotechnology and its Applications

Question. 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. Answer. (c) toxin is inactive. Question.…

NCERT Solutions Class 12 Biology Chapter 11 Biotechnology Principles And Processes

Question. Can you list 10 recombinant proteins which are used in medical practice? Find out where they are used as therapeutics (use the internet). Answer.Recombinant proteins                       Therapeutic uses (i…

NCERT Solutions Class 12 Biology Chapter 10 Microbes in Human Welfare

Question. Bacteria cannot be seen with the naked eyes, but these can be seen with the help of a microscope.If you have to carry a sample from your home to your biology laboratory to demonstrate the presence of microbes under a microscope, which sample would you carry and why?…

NCERT Solutions Class 12 Biology Chapter 3 Human Reproduction

Question. Fill in the blanks. (a) Humans reproduce _____________________. (asexually/sexually) (b) Humans are _____________________. (oviparous, viviparous, ovoviviparous) (c) Fertilisation is _____________________ in humAnswer. (external/internal) (d) Male and female gametes…