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Science · 2024 · 5 marks
CBSE 2024 · Region 2 · Set 1 · Q35
(a) (i) Distinguish between hormonal co-ordination in plants and animals. (ii) Which part of the brain is responsible for - (1) intelligence (2)…
(a)(i)
Distinguish between hormonal co-ordination in plants and animals.
(ii)
Which part of the brain is responsible for -
(1)
intelligence
(2)
riding a bicycle
(3)
vomiting
(4)
controlling hunger
(iii)
How is brain and spinal-cord protected against mechanical injuries ?
OR 35. (b) (i) What are tropic movements ? Give an example of a plant hormone which ($\displaystyle 1$) inhibits growth and ($\displaystyle 2$) promotes cell division.
(ii)
Explain directional movement of a tendril in pea plant in response to touch. Name the hormone responsible for this movement.
Marking-scheme solution
$\displaystyle 1{,}1$
\(\displaystyle \frac{1}{2} \times 4\)
direction/directional movements due to light, gravity etc.
(1) Plant growth inhibitor: Abscisic Acid
(2) Promotes cell division - Cytokinins
(ii)
When the tendrils come in contact with any support, auxins move away from the point of contact of the support. More growth occurs on the side away from the support. As a result, unequal growth occurs on its two sides and thus tendrils coil/ circle around the support.
Auxins
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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.