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MODEL PAPER 3 — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYMODEL PAPER 33 Marks
Question
Distinguish between
i. Grey matter and White matter
ii. A stimulus and An Impulse
✓

Answer

i. Difference between Grey matter and White matter:
Grey MatterWhite matter
It is composed of cell bodies (cytons) of a nerve cell. It is inside the brain but outside the spinal cordIt is composed of axons from the nerves cells. It is inside the brain but outside the spinal cord.
ii. Difference between A stimulus and An impulse:
A stimulusAn impulse
Any change in the environment of an organism that evokes response or impulse.It is a self-propagating wave electrochemical in nature; negatively travelling along the axon of a nerve cell.

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