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Science (English Medium) Class 12 - CBSE Question Bank Solutions

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Name the function of the following:

Endometrium

[2] Human Reproduction
Chapter: [2] Human Reproduction
Concept: undefined >> undefined

Name the function of the following:

Sperm tail

[2] Human Reproduction
Chapter: [2] Human Reproduction
Concept: undefined >> undefined

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Identify True/False statement. Correct false statement to make it true.

Presence or absence of hymen is not a reliable indicator of virginity or sexual experience.

[2] Human Reproduction
Chapter: [2] Human Reproduction
Concept: undefined >> undefined

How many eggs are released by a human ovary in a month? How many eggs do you think would have been released if the mother gave birth to identical twins? Would your answer change if the twins born were fraternal?

[2] Human Reproduction
Chapter: [2] Human Reproduction
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How many eggs do you think were released by the ovary of a female dog which gave birth to 6 puppies?

[2] Human Reproduction
Chapter: [2] Human Reproduction
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What are the suggested reasons for population explosion?

[3] Reproductive Health
Chapter: [3] Reproductive Health
Concept: undefined >> undefined

Is the use of contraceptives justified? Give reasons.

[3] Reproductive Health
Chapter: [3] Reproductive Health
Concept: undefined >> undefined

Removal of gonads cannot be considered as a contraceptive option. Why?

[3] Reproductive Health
Chapter: [3] Reproductive Health
Concept: undefined >> undefined

Name the function of the following:

Fimbriae

[2] Human Reproduction
Chapter: [2] Human Reproduction
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State True/False with explanation.

Complete lactation could help as a natural method of contraception.

[3] Reproductive Health
Chapter: [3] Reproductive Health
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Correct the following statement:

Surgical methods of contraception prevent gamete formation.

[3] Reproductive Health
Chapter: [3] Reproductive Health
Concept: undefined >> undefined

Correct the following statement:

Oral pills are very popular contraceptives among the rural women.

[3] Reproductive Health
Chapter: [3] Reproductive Health
Concept: undefined >> undefined

In which way have microbes played a major role in controlling diseases caused by harmful bacteria?

[8] Microbes in Human Welfare
Chapter: [8] Microbes in Human Welfare
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Name any two species of fungus, which are used in the production of the antibiotics.

[8] Microbes in Human Welfare
Chapter: [8] Microbes in Human Welfare
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Find out the name of the microbes from which cyclosporin A (an immunosuppressive drug) and statins (blood cholesterol lowering agents) are obtained.

[8] Microbes in Human Welfare
Chapter: [8] Microbes in Human Welfare
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Arrange the following in the decreasing order (most important first) of their importance, for the welfare of human society. Give reasons for your answer.

Biogas, Citric acid, Penicillin and Curd

[8] Microbes in Human Welfare
Chapter: [8] Microbes in Human Welfare
Concept: undefined >> undefined

Make a chart (with diagrammatic representation) showing a restriction enzyme, the substrate DNA on which it acts, the site at which it cuts DNA and the product it produces.

[9] Biotechnology - Principles and Processes
Chapter: [9] Biotechnology - Principles and Processes
Concept: undefined >> undefined

Collect 5 examples of palindromic DNA sequences. Better try to create a palindromic sequence by following base-pair rules.

[9] Biotechnology - Principles and Processes
Chapter: [9] Biotechnology - Principles and Processes
Concept: undefined >> undefined

Explain briefly:

Restriction enzymes and DNA

[9] Biotechnology - Principles and Processes
Chapter: [9] Biotechnology - Principles and Processes
Concept: undefined >> undefined

Distinguish between exonuclease and endonuclease.

[9] Biotechnology - Principles and Processes
Chapter: [9] Biotechnology - Principles and Processes
Concept: undefined >> undefined
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