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Tamil Nadu Board of Secondary EducationHSC Science Class 12

HSC Science Class 12 - Tamil Nadu Board of Secondary Education Question Bank Solutions

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Differentiate continuous variation with a discontinuous variation.

[2] Classical Genetics
Chapter: [2] Classical Genetics
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PBR 322, BR stands for

[4] Principles and Processes of Biotechnology
Chapter: [4] Principles and Processes of Biotechnology
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Write the benefits and risk of Genetically Modified Foods.

[4] Principles and Processes of Biotechnology
Chapter: [4] Principles and Processes of Biotechnology
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Totipotency refers to

[5] Plant Tissue Culture
Chapter: [5] Plant Tissue Culture
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Match the following:

Column A Column B
1) Totipotency A) Reversion of mature cells into meristerm
2) Dedifferentiation B) Biochemical and structural changes of cells
3) Explant C) Properties of living cells develop into the entire plant
4) Differentiation D) Selected plant tissue transferred to the culture medium
[5] Plant Tissue Culture
Chapter: [5] Plant Tissue Culture
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Select the incorrect statement from given statement

[5] Plant Tissue Culture
Chapter: [5] Plant Tissue Culture
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Which of the following would most likely help to slow down the greenhouse effect.

[8] Environmental Issues
Chapter: [8] Environmental Issues
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Find the wrongly matched pair.

[8] Environmental Issues
Chapter: [8] Environmental Issues
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Depletion of which gas in the atmosphere can lead to an increased incidence of skin cancer?

[8] Environmental Issues
Chapter: [8] Environmental Issues
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One green house gas contributes 14% of total global warming and another contributes 6%. These are respectively identified as 

[8] Environmental Issues
Chapter: [8] Environmental Issues
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One of the chief reasons among the following for the depletion in the number of species making endangered is

[8] Environmental Issues
Chapter: [8] Environmental Issues
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The unit for measuring ozone thickness

[8] Environmental Issues
Chapter: [8] Environmental Issues
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What is ozone hole?

[8] Environmental Issues
Chapter: [8] Environmental Issues
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Which one gas is most abundant out of the four commonest greenhouse gases?
Discuss the effect of this gas on the growth of plants?

[8] Environmental Issues
Chapter: [8] Environmental Issues
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The invasive species introduced in India from Philippines

[8] Environmental Issues
Chapter: [8] Environmental Issues
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Cash crops like sesame and pearl millet are inhibited by the invasive plant

[8] Environmental Issues
Chapter: [8] Environmental Issues
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The plants which are grown in silivpasture system are

[8] Environmental Issues
Chapter: [8] Environmental Issues
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Which one of the following are the species that are crossed to give sugarcane varieties with high sugar, high yield, thick stems, and the ability to grow in the sugarcane belt of North India?

[9] Plant Breeding
Chapter: [9] Plant Breeding
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Consider the following statements and choose the right option.

  1. Cereals are members of the grass family.
  2. Most of the food grains come from monocotyledon.
[10] Economically Useful Plants and Entrepreneurial Botany
Chapter: [10] Economically Useful Plants and Entrepreneurial Botany
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Assertion: Vegetables are important part of healthy eating.

Reason: Vegetables are succulent structures of plants with pleasant aroma and flavours.

[10] Economically Useful Plants and Entrepreneurial Botany
Chapter: [10] Economically Useful Plants and Entrepreneurial Botany
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