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(a) Mention any two… (Class 12 Biology 2025, Q27)

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BiologyCBSE Class 12 · Board exam 2025, set 57/7/1 · 3 marks · Short answer

CBSE Class 12 Biology 2025: question 27

Set in the CBSE Class 12 board exam of 2025, paper 57/7/1, section C, question 27, for 3 marks. Try it first; the hints and our step-by-step solution are below.

Q27 · 3 marks · Short answerBiotechnology and its Applications

(a) Mention any two advantages of micropropagation techniques.
(b) Write in brief how the process is carried out in the laboratory.
(c) Name any two important food plants grown commercially by this method.

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 57/7/1.

Hints

Open one hint at a time and try again before the next.

Hint 1

Micropropagation is tissue culture used to produce many plants.

Hint 2

Think about the explant, sterility and the parts of the culture medium.

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

  1. (a) Advantage 1: a large number of plants can be produced in a very short time.

    ½ mark

  2. Advantage 2: all the plants are genetically identical (somaclones) to the parent. Plants without seeds, or where sexual reproduction is not possible, can also be multiplied.

    ½ mark

  3. (b) A small part of the plant, called the explant, is taken and grown in a test tube under sterile (aseptic) conditions.

    ½ mark

  4. It is grown on a nutrient medium containing sucrose, inorganic salts, vitamins, amino acids and growth regulators such as auxins and cytokinins. The explant forms callus and then develops into many plantlets.

    ½ mark

  5. (c) Food plants grown commercially by micropropagation: banana.

    ½ mark

  6. Tomato (apple is also correct).

    ½ mark

Answer: (a) Many plants in a short time; genetically identical plants. (b) An explant is grown on a sterile nutrient medium with sucrose, salts, vitamins, amino acids, auxins and cytokinins. (c) Banana, tomato (or apple).

Where the marks are

  • Any two advantages (½ + ½ mark)
  • Explant grown under sterile conditions (½ mark)
  • Nutrient medium with sucrose, vitamins, salts and growth regulators (½ mark)
  • Two food plants, e.g. banana, tomato, apple (½ + ½ mark)

Revise the chapter

Practise this chapterBoard-style questions from Biotechnology and its Applications, one at a time, marked against the answer key and marking points.Back to the full paper2025 board paper, set 57/7/1: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.