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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 for Botany

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Botany
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Sandy soil is not suitable for cultivation. Explain why?

[6] Principles of Ecology
Chapter: [6] Principles of Ecology
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Describe the mutual relationship between the fig and wasp and comment on the phenomenon that operates in this relationship.

[6] Principles of Ecology
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What is thermal stratification? Mention their types.

[6] Principles of Ecology
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What is myrmecophily?

[6] Principles of Ecology
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What is a seed ball?

[6] Principles of Ecology
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What is co-evolution?

[6] Principles of Ecology
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Explain Raunkiaer classification in the world’s vegetation based on the temperature.

[6] Principles of Ecology
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Explain different types of hydrophytes with examples.

[6] Principles of Ecology
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What are the advantages of seed dispersal?

[6] Principles of Ecology
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Describe the dispersal of fruit and seeds by animals.

[6] Principles of Ecology
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Read the following statements and fill up the blanks with the correct option.

  1. Total soil water content in soil is called ______
  2. Soil water not available to plants is called ______
  3. Soil water available to plants is called ______
[6] Principles of Ecology
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Identify the A, B, C, and D in the given table

Interaction Effects on species X Effects on species Y
Mutualism A (+)
B (+) (-)
Competition (-) C
D (-) 0
[6] Principles of Ecology
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Column I represent the size of the soil particles and Column II represents the type of soil components. Which of the following is the correct match for the Column I and Column IL

Column - I Column - II
I) 0.2 to 2.00 mm i) Slit soil
II) Less than 0.002 mm ii) Clayey soil
III) 0.002 to 0.02 mm iii) Sandy soil
IV) 0.002 to 0.2 mm iv) Loamy soil
[6] Principles of Ecology
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What is the soil profile? Explain the characters of different soil horizons.

[6] Principles of Ecology
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Explain afforestation with case studies.

[8] Environmental Issues
Chapter: [8] Environmental Issues
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Which one of the following pairs of codons are correctly matched with their function or the signal for the particular amino acid?

[3] Chromosomal Basis of Inheritance
Chapter: [3] Chromosomal Basis of Inheritance
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How sex is determined in monoecious plants. write their genes involved in it.

[3] Chromosomal Basis of Inheritance
Chapter: [3] Chromosomal Basis of Inheritance
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Restriction enzymes are

[4] Principles and Processes of Biotechnology
Chapter: [4] Principles and Processes of Biotechnology
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Consider the following statements:

  1. Recombinant DNA technology is popularly known as genetic engineering is a stream of biotechnology which deals with the manipulation of genetic materials by man invitro
  2. pBR322 is the first artificial cloning vector developed in 1977 by Boliver and Rodriguez from E.coli plasmid
  3. Restriction enzymes belong to a class
    of enzymes called nucleases. Choose the correct option regarding the above statements
[4] Principles and Processes of Biotechnology
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Which one of the following palindromic base sequences in DNA can be easily cut at about the middle by some particular restriction enzymes?

[4] Principles and Processes of Biotechnology
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