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Tamil Nadu Board of Secondary EducationHSC Science कक्षा १२

HSC Science कक्षा १२ - Tamil Nadu Board of Secondary Education Question Bank Solutions for Botany

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Botany
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Identify the correctly matched pair

[1] Asexual and Sexual Reproduction in Plants
Chapter: [1] Asexual and Sexual Reproduction in Plants
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A Plant called X possesses small flower with reduced perianth and versatile anther. The probable agent for pollination would be

[1] Asexual and Sexual Reproduction in Plants
Chapter: [1] Asexual and Sexual Reproduction in Plants
Concept: undefined >> undefined

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Consider the following statement(s)

  1. In Protandrous flowers, pistil matures earlier
  2. In Protogynous flowers, pistil matures earlier
  3. Herkogamy is noticed in unisexual flowers
  4. Distyle is present in Primula
[1] Asexual and Sexual Reproduction in Plants
Chapter: [1] Asexual and Sexual Reproduction in Plants
Concept: undefined >> undefined

What is reproduction?

[1] Asexual and Sexual Reproduction in Plants
Chapter: [1] Asexual and Sexual Reproduction in Plants
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What are clones?

[1] Asexual and Sexual Reproduction in Plants
Chapter: [1] Asexual and Sexual Reproduction in Plants
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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
Concept: undefined >> undefined

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
Concept: undefined >> undefined

The invasive species introduced in India from Philippines

[8] Environmental Issues
Chapter: [8] Environmental Issues
Concept: undefined >> undefined
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