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1. Can you list 10 recombinant proteins which are used in medical practice? Find out where they are used as therapeutics (use the internet). Solution: The recombinant proteins used in medical practice are obtained from the recombinant DNA technology. In this technology, particular genes are transferred from one organism to another with the help of …

NCERT Solutions for Class 12th Chapter – Biotechnology: Principles and Processes Read More »

Question 1: 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? Answer: Curd can be used …

NCERT Solutions for Class 12 Biology Chapter 10 – Microbes in Human Welfare Read More »

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 …

NCERT Solutions for Class 12 Biology Chapter 9 – Strategies for Enhancement in Food Production Read More »

Question 1: What are the various public health measures, which you would suggest as safeguard against infectious diseases? Answer: Public health measures are preventive measures which are taken to check the spread of various infectious diseases. These measures should be taken to reduce the contact with infectious agents. Some of these methods are: (1) Maintenance of …

NCERT Solutions for Class 12 Biology Chapter 8 – Human Health and Disease Read More »

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. …

NCERT Solutions for Class 12 Biology Chapter 7 – Evolution Read More »

Question 1: Group the following as nitrogenous bases and nucleosides: Adenine, Cytidine, Thymine, Guanosine, Uracil and Cytosine. Answer: Nitrogenous bases present in the list are adenine, thymine, uracil, and cytosine. Nucleosides present in the list are cytidine and guanosine. Question 2: If a double stranded DNA has 20 per cent of cytosine, calculate the per …

NCERT Solutions for Class 12 Biology Chapter 6 – Molecular Basis of Inheritance Read More »

Question 1: Mention the advantages of selecting pea plant for experiment by Mendel. Answer: Mendel selected pea plants to carry out his study on the inheritance of characters from parents to offspring. He selected a pea plant because of the following features. (a) Peas have many visible contrasting characters such as tall/dwarf plants, round/wrinkled seeds, green/yellow …

NCERT Solutions for Class 12 Biology Chapter 5 – Principles of Inheritance and Variation Read More »

Question 1: What do you think is the significance of reproductive health in a society? Answer: Reproductive health is the total well being in all aspects of reproduction. It includes physical, emotional, behavioural, and social well being. Sexually transmitted diseases such as AIDS, gonorrhoea, etc. are transferred from one individual to another through sexual contact. …

NCERT Solutions for Class 12 Biology Chapter 4 – Reproductive Health Read More »

Question 1: Fill in the blanks: (a) Humans reproduce __________. (asexually/sexually) (b) Humans are__________. (oviparous/viviparous/ovoviviparous) (c) Fertilization is __________ in humans. (external/internal) (d) Male and female gametes are __________. (diploid/haploid) (e) Zygote is __________. (diploid/haploid) (f) The process of release of the ovum from a mature follicle is called__________. (g) Ovulation is induced by a hormone called the __________. (h) The fusion of …

NCERT Solutions for Class 12 Biology Chapter 3 – Human Reproduction Read More »

Question 1: Name the parts of an angiosperm flower in which development of male and female gametophyte take place. Answer: The male gametophyte or the pollen grain develops inside the pollen chamber of the anther, whereas the female gametophyte (also known as the embryo sac) develops inside the nucellus of the ovule from the functional …

NCERT Solutions for Class 12 Biology Chapter 2 – Sexual Reproduction in Flowering Plants Read More »