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Science · 2023 · 3 marks
CBSE 2023 · Region 6 · Set 2 · Q29
(a) Some plants like pea plants have tendrils which help them to climb up other plants. Explain how is it done. Name the plant hormone responsible…
(a)
Some plants like pea plants have tendrils which help them to climb up other plants. Explain how is it done. Name the plant hormone responsible for this movement.
OR
(b)
Name the phenomenon occurring in plants which are under the control of gravity, water and chemicals with one example each that shows the movement involved.
Marking-scheme solution
(a)
• Tendrils are sensitive to touch, when they come in contact with any support.
The part of the tendril in contact with the object does not grow as rapidly as the part of the tendril away from the object. This causes the tendril to circle around the object and cling to it.
Auxin
OR
(b)
Geotropism : - Downward growth of roots/Growth of roots in response to gravity.
Hydrotropism : - Movement of roots towards water.
Chemotropism : - growth of pollen tubes towards ovule in response to chemical.
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CBSE Class 10 Science past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.