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Science · 2025 · 3 marks
CBSE 2025 · Region 4 · Set 1 · Q30
State two limitations of electrical impulses in multicellular organisms. Why is chemical communication better than electrical impulses as a means of…
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?
Marking-scheme solution
Limitations of electrical impulse:
They reach only those cells that are connected by nervous tissue, and not every cell in the animal body.
Once an electrical impulse is generated in a cell and transmitted, the cell will take some time to reset its mechanism before it can generate and transmit a new impulse. / Takes sometime to reset its mechanism.
In chemical communication the signals (chemical compound) potentially reach all cells of the body steadily and persistently providing the desired changes.
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CBSE Class 10 Science past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.