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Q34 (IAS/2005) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Microbiology and immunity Answer Verified

Assertion (A) : Amoeba is reproduced by fission. Reason (R) : All unicellular organisms are reproduced by asexual methods.

Result
Your answer: —  Â·  Correct: C
Explanation

Assertion (A) is true: Amoeba commonly reproduces asexually by binary fission, where a single cell divides to form two daughter cells, as noted for single-celled organisms like amoebae [1]. Reason (R) is false: not all unicellular organisms reproduce only by asexual methods. Many unicellular taxa are capable of sexual or sex-like processes (for example, conjugation in some protists and yeasts); unicellular reproduction can be sexual or asexual depending on the group and conditions [2]. Therefore A is correct but R is incorrect because the reason overgeneralizes the reproductive modes of all unicellular life.

Sources

  1. [1] Science ,Class VIII . NCERT(Revised ed 2025) > Chapter 13: Our Home: Earth, a Unique Life Sustaining Planet > Ever heard of ... Ever heard of ... > p. 221
  2. [2] https://www.geeksforgeeks.org/biology/unicellular-organisms/
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