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Science · 2024 · 3 marks
CBSE 2024 · Region 3 · Set 1 · Q30
(a) List two constituents of Central Nervous System (CNS). How are these components protected from injuries? (b) Write two limitations of the use of…
(a)
List two constituents of Central Nervous System (CNS). How are these components protected from injuries ?
(b)
Write two limitations of the use of electrical impulses.
Marking-scheme solution
(a) Constituents:- Brain and Spinal cord.
Protection:- Brain - Bony box/in skull/Cranium/fluid filled balloon. Spinal Cord - Vertebral column.
(b)
Limitations :
(i)
They will reach only those cells that are connected by nervous tissue, not each and every cell in the animal body.
(ii)
Once an electrical impulse is generated in a cell and transmitted, the cell will take some time to reset its mechanisms before it can generate and transmit a new impulse.
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CBSE Class 10 Science past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.