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In which of the following… (Class 12 Biology 2024, Q1)

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BiologyCBSE Class 12 · Board exam 2024, set 57/1/1 · 1 mark · MCQ

CBSE Class 12 Biology 2024: question 1

Set in the CBSE Class 12 board exam of 2024, paper 57/1/1, section A, question 1, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q1 · 1 mark · MCQSexual Reproduction in Flowering Plants

In which of the following plants are both male and female flowers born on the same plant and the mode of pollination can be geitonogamy or xenogamy ?

  1. (A)Papaya
  2. (B)Date Palm
  3. (C)Maize
  4. (D)Spinach

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 57/1/1.

Hints

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

Hint 1

Think about monoecious versus dioecious plants.

Hint 2

Geitonogamy needs both kinds of flowers on the same plant.

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. Maize is monoecious: male (tassel) and female (cob) flowers occur on the same plant, so pollen can reach another flower of the same plant (geitonogamy) or a different plant (xenogamy).

    1 mark

  2. Papaya, date palm and spinach are dioecious, so only xenogamy is possible in them.

Answer: (C) Maize

Where the marks are

  • Identifies maize as the monoecious plant (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Sexual Reproduction in Flowering Plants, one at a time, marked against the answer key and marking points.Back to the full paper2024 board paper, set 57/1/1: 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.