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Which of the following fish… (Class 12 Biology 2026, Q12)

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

CBSE Class 12 Biology 2026: question 12

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

Q12 · 1 mark · MCQBiodiversity and Conservation

Which of the following fish led to the extinction of an ecologically unique assemblage of more than 200 species of cichlid fish in Lake Victoria of East Africa ?

  1. (A)Catla Catla
  2. (B)Dogfish
  3. (C)Nile Perch
  4. (D)African Catfish

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

This is an NCERT example of alien species invasion.

Hint 2

The fish is a predator named after an African river.

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. The Nile perch was introduced into Lake Victoria. As an alien species it preyed on the native fish.

    ½ mark

  2. This led to the extinction of more than 200 cichlid species. The answer is (C).

    ½ mark

Answer: (C) Nile Perch

Where the marks are

  • Chooses (C) (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Biodiversity and Conservation, 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.