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GS Paper IUPSC Prelims 2020
Health & Medicine
Question No. 163Interactive Test Mode
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Q163. Which of the following statements are correct regarding the general difference between plant and animal cells? 1. Plant cells have cellulose cell walls whilst animal cells do not. 2. Plant cells do not have plasma membranes unlike animal cells which do. 3. Mature plant cell has one large vacuole whilst an animal cell has many small vacuoles. Select the correct answer using the code given below:

Which of the following statements are correct regarding the general difference between plant and animal cells?

  1. Plant cells have cellulose cell walls whilst animal cells do not.
  2. Plant cells do not have plasma membranes unlike animal cells which do.
  3. Mature plant cell has one large vacuole whilst an animal cell has many small vacuoles. Select the correct answer using the code given below:
Select the correct option below (or cross out options to eliminate)
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Official Answer Key & Detailed Solution

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Official UPSC Answer KeyUPSC Prelims 2020 • Science and Technology

Correct Answer: Option (C) — 1 and 3 only

Concept & Option Breakdown

Standard Reference Verified

Statement 1 is correct: Plant cells are encased by a rigid cell wall composed primarily of cellulose, which provides structural support. Animal cells lack a cell wall. Statement 2 is incorrect: Both plant and animal cells possess a phospholipid bilayer plasma membrane that encloses the cytoplasm and controls the transport of substances. Statement 3 is correct: Mature plant cells typically contain a large central vacuole occupying up to 90% of the cell volume, maintaining turgidity, whereas animal cells contain small, multiple, transient vacuoles.

Elimination Heuristic & Exam Approach

Statement 2 asserts that plant cells lack a plasma membrane. All living cellular life (prokaryotic and eukaryotic) requires a plasma membrane to maintain cellular integrity, making Statement 2 clearly false.

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Question Specifications & Syllabus Mapping

Examination & YearUPSC Civil Services Preliminary Examination 2020 (Q163)
Paper & Marking SchemeGS Paper I • 2 Marks (-0.66 Negative for incorrect response)
Syllabus Subject & TopicScience and Technology → Health & Medicine
Official Answer KeyOption (C) — 1 and 3 only

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Frequently Asked Questions — UPSC Prelims 2020 Q163

What is the official answer for UPSC Prelims 2020 GS Paper I Question 163 (Science and Technology)?

The official UPSC answer key for this 2020 Science and Technology (Health & Medicine) question is Option (C): "1 and 3 only". Correct attempts carry 2 Marks with -0.66 Negative penalty for wrong answers.

Which UPSC Prelims syllabus topic does this 2020 question belong to?

This question belongs to GS Paper I under the subject "Science and Technology" and micro-topic "Health & Medicine". You can explore all repeated questions from Health & Medicine in Acme AI's 3D Prelims PYQ Realm or practice 50 full-length and sectional tests in the APT Prelims Test Series.

How can I solve this Health & Medicine UPSC Prelims question using option elimination?

Statement 2 asserts that plant cells lack a plasma membrane. All living cellular life (prokaryotic and eukaryotic) requires a plasma membrane to maintain cellular integrity, making Statement 2 clearly false.

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