Q8
1 markMCQSection A

Observe the given figures A and B. When chhui-mui (sensitive) plant is touched, its leaves fold. This is due to:

Figure for question 8
Control and Coordination
Reflex Actions

Options

(A)Hormonal effect
(B)Thermal effect
(C)Change in amount of water in cells
(D)Electromagnetic effect
Official Answer

Change in amount of water in cells

reflex actionssensitive plantchange in amount of water in cells

Marking Scheme

  • 1Change in amount of water in cells

Hint

Observe the given figure and think about what could cause the leaves to fold up.

Quick Oral Answer

The folding of leaves in the sensitive plant is due to a change in the amount of water in the cells. When the plant is touched, it loses water and the leaves fold up. This is an example of a reflex action, which is a rapid response to a stimulus that does not require conscious thought.

Analysis & Explanation

The question requires the student to observe the given figure and understand the concept of reflex actions. The correct answer is C) Change in amount of water in cells, as the folding of leaves in the sensitive plant is due to a change in the amount of water in the cells. The other options are incorrect as they do not relate to the concept of reflex actions or the folding of leaves in the sensitive plant.

Common Mistakes

  1. 1thinking that the folding of leaves is due to hormonal effects
  2. 2thinking that the folding of leaves is due to thermal effects
  3. 3thinking that the folding of leaves is due to electromagnetic effects

Interesting Facts

Sensitive plants are also known as touch-me-not plants.

The folding of leaves in sensitive plants is a defense mechanism to protect themselves from herbivores.

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Frequently Asked Questions

How many marks does this question carry in CBSE Class 10 Science 2025?

This question carries 1 mark in the CBSE Class 10 Science 2025 examination.

Which chapter does this question come from in Science?

This question is from the chapter "Control and Coordination" in the CBSE Class 10 Science syllabus.

What topic does this question cover in Science?

This question covers the topic "Reflex Actions" from CBSE Class 10 Science.

What type of question is this in the CBSE Class 10 Science 2025 paper?

This is a MCQ question from Section A in the CBSE Class 10 Science 2025 paper.