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Science (086) — AI-generated practice question

AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.

Q1. [1] medium exam-ready
How do plant cells bring about movement in the absence of muscle tissue?
  1. A By generating electrical impulses in specialised nerve-like cells
  2. B By changing the amount of water in the cells, causing swelling or shrinking
  3. C By rearranging contractile proteins similar to those in animal muscle
  4. D By releasing auxin which directly contracts the cell wall
Generated by claude-sonnet-4-6 · 2026-06-26 01:00 · grounding rag
Model Answer

Answer: B

Plant cells change shape by changing the amount of water in them, causing swelling or shrinking, which results in movement without any muscle tissue.

Source: Chapter 6, Section 6.2.1 – Immediate Response to Stimulus

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Explanation

The passage explicitly states: "plant cells change shape by changing the amount of water in them, resulting in swelling or shrinking." Options A and C describe animal mechanisms (electrical impulses and contractile proteins). Option D is incorrect — auxin promotes cell elongation in growth movements, it does not directly contract the cell wall. Examiners expect you to identify osmotic change (water content) as the key mechanism.

Previous-year CBSE Grade 10 board exam questions, organised by subject and chapter, each with a model answer — free to read and print.