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State two limitations of… (Class 10 Science 2025, Q30)

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ScienceCBSE Class 10 · Board exam 2025, set 31/4/1 · 3 marks · Short answer

CBSE Class 10 Science 2025: question 30

Set in the CBSE Class 10 board exam of 2025, paper 31/4/1, section C, question 30, for 3 marks. Try it first; the hints and our step-by-step solution are below.

Q30 · 3 marks · Short answerControl and Coordination

State two limitations of electrical impulses in multicellular organisms. Why is chemical communication better than electrical impulses as a means of communication between cells in multicellular organisms?

Source: official question paper from cbse.gov.in (PDF). See it in the full 2025 board paper, set 31/4/1.

Hints

Open one hint at a time and try again before the next.

Hint 1

Consider which cells an impulse can physically reach.

Hint 2

Hormones travel through blood. What advantage does that give over nerves?

Step-by-step solution

Each step shows the marks it earns, as an examiner would award them. Checked by an independent re-solve from the question paper.

  1. Limitation 1: Electrical impulses reach only those cells that are connected by nervous tissue, not every cell of the body.

    1 mark

  2. Limitation 2: Once a cell generates and transmits an impulse, it takes some time to reset its mechanism before it can send a new impulse. So cells cannot generate and transmit impulses continuously.

    1 mark

  3. Chemical communication is better: hormones are released into the blood, so they can potentially reach all cells of the body. They act steadily and persistently to bring about the desired changes, such as growth.

    1 mark

Answer: Impulses reach only nerve-connected cells, and cells need time to reset before the next impulse. Chemical signals (hormones) reach all cells steadily and persistently.

Where the marks are

  • First limitation: reaches only cells connected by nervous tissue (1 mark)
  • Second limitation: cell needs time to reset before a new impulse (1 mark)
  • Chemical signals reach all cells steadily and persistently (1 mark)

Revise the chapter

Practise this chapterBoard-style questions from Control and Coordination, one at a time, marked against the answer key and marking points.Back to the full paper2025 board paper, set 31/4/1: every question, by section.

The question is transcribed from the official paper; figures are described in words. The solution, hints and chapter tag are ours. Spotted an error? Write tosupport@questionbuddy.in.