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Answer the following. (Class 10 Science 2024, Q30)

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ScienceCBSE Class 10 · Board exam 2024, set 31/3/1 · 3 marks · Short answer

CBSE Class 10 Science 2024: question 30

Set in the CBSE Class 10 board exam of 2024, paper 31/3/1, 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

Answer the following.

  1. (a)

    List two constituents of Central Nervous System (CNS). How are these components protected from injuries ?

    0 marks
  2. (b)

    Write two limitations of the use of electrical impulses.

    0 marks

Source: official question paper from cbse.gov.in (PDF). See it in the full 2024 board paper, set 31/3/1.

Hints

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

Hint 1

CNS = the 'central' parts: one in the head, one along the back.

Hint 2

Which bones enclose each of them?

Hint 3

Think about which cells nerves actually reach, and whether a nerve cell can fire non-stop.

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. (a) Constituents: The CNS consists of the brain and the spinal cord.

    1 mark

  2. (a) Protection of brain: The brain lies inside a bony box, the skull (cranium). It is cushioned by a fluid-filled balloon, the cerebrospinal fluid, which acts as a shock absorber.

    ½ mark

  3. (a) Protection of spinal cord: The spinal cord is protected by the vertebral column (backbone).

    ½ mark

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

    ½ mark

  5. (b) Limitation 2: After a cell generates and transmits an impulse, it needs time to reset before it can send a new one. So cells cannot generate impulses continuously.

    ½ mark

Answer: (a) Brain and spinal cord. The brain is protected by the skull (cranium) and fluid; the spinal cord by the vertebral column. (b) Impulses reach only cells connected to nerves; a cell needs time to reset before sending another impulse.

Where the marks are

  • Names brain and spinal cord (½ + ½ marks)
  • Brain protected by skull/cranium/fluid (½ mark)
  • Spinal cord protected by vertebral column (½ mark)
  • Two limitations of electrical impulses (½ + ½ marks)

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 paper2024 board paper, set 31/3/1: 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.