Biology
Categorise the following under stimulus and response.
(i) Withdrawal of hand on touching a hot plate.
(ii) Seeing a green light turning into red at a road crossing before applying the brakes.
(iii) Pain in the eye if something falls into it.
Nervous System
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Answer
(i) Stimulus — Touching a hot plate.
Response — Withdrawal of hand.
(ii) Stimulus — Seeing a green light turning into red at a road crossing.
Response — Applying the brakes.
(iii) Stimulus — Something falling into the eye.
Response — Pain in the eye.
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Related Questions
Write one word for each of the following:
(i) The structural and functional unit of nervous system.
(ii) Wave of electrical disturbance that sweeps over the nerve cell.
(iii) Long thread-like part of the nerve cell.
(iv) Point of contact between two nerve cells.
(v) A bundle of axons enclosed in a tubular sheath.
(vi) The kind of nerve carrying impulses from the brain to a gland or muscle.
Fill in the blanks by choosing the correct alternative given for each.
(i) Brain and spinal cord are the parts of …………… nervous system. (central/peripheral/autonomous)
(ii) …………… is the largest part of the brain. (Cerebellum/cerebrum/medulla oblongata)
(iii) White matter consists mainly of …………… . (axons/dendrites/cytons)
(iv) The part of the brain concerned with body balance is …………… .(cerebrum, cerebellum, medulla oblongata)
Given below are a few common reflexes in humans. Classify them as a simple or conditioned reflex.
(i) Knee-jerk.
(ii) Watering of mouth on seeing a favourite dish.
(iii) Tying of shoe laces while talking.
(iv) Closing of eyelids if a strong beam of light is flashed across.
Given alongside is a partial diagrammatic representation of a certain phenomenon pertaining to the nervous system.
(i) Name the parts numbered 1-7
(ii) Name the phenomenon that the diagram depicts and define it.
(iii) Give the technical term for the point of contact between two nerve cells.
(iv) Name the parts not shown in the diagram that should be included to complete the pathway of the phenomenon.