Current set IAS · 2005 Q34

Pick exam & year, then Go.

Exam

Year

Not attempted Correct Incorrect ★ Bookmarked

Loading…

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.

A

Both (A) and (R) are individually true and R is the correct explanation of A

B

Both (A) and (R) are individually true and R is not the correct explanation of A

C

A is true but R is false

D

A is false but R is true

Result

Your answer: — · 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] 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] https://www.geeksforgeeks.org/biology/unicellular-organisms/

How others answered

Each bar shows the % of students who chose that option. Green bar = correct answer, blue outline = your choice.

Community Performance

Out of everyone who attempted this question.

54%

got it right

Change set

Question map

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

Explanation

SIMILAR QUESTIONS

5 Cross-Linked PYQs