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Select the odd option in the… (Class 12 Biology 2026, Q11)

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BiologyCBSE Class 12 · Board exam 2026, set 57/5/1 · 1 mark · MCQ

CBSE Class 12 Biology 2026: question 11

Set in the CBSE Class 12 board exam of 2026, paper 57/5/1, section A, question 11, for 1 mark. Try it first; the hints and our step-by-step solution are below.

Q11 · 1 mark · MCQEvolution

Select the odd option in the context of convergent evolution.

  1. (A)Eyes of Octopus and Mammals
  2. (B)Flippers of Penguins and Dolphins
  3. (C)Flying Squirrel and Flying Phalanger
  4. (D)Thorns of Bougainvillea and Tendrils of Cucurbita

Source: official question paper from cbse.gov.in (PDF). See it in the full 2026 board paper, set 57/5/1.

Hints

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

Hint 1

Convergent evolution produces analogous structures.

Hint 2

Which pair shares the same origin but performs different functions?

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. Options A, B and C are analogous structures or forms that arose by convergent evolution.

    ½ mark

  2. The thorns of Bougainvillea and the tendrils of Cucurbita are homologous organs, so they show divergent evolution. This makes (D) the odd one out.

    ½ mark

Answer: (D)

Where the marks are

  • Identifies the homologous pair, option (D) (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Evolution, one at a time, marked against the answer key and marking points.Back to the full paper2026 board paper, set 57/5/1: 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.