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Science · 2024 · 2 marks
CBSE 2024 · Region 1 · Set 1 · Q23
(A) How is the movement of leaves of a sensitive plant different from the downward movement of the roots?
(A)
How is the movement of leaves of a sensitive plant different from the downward movement of the roots ?
OR
(B)
There is a hormone which regulates carbohydrate, protein and fat metabolism in our body. Name the hormone and the gland which secretes it. Why is it important for us to have iodised salt in our diet?
Marking-scheme solution
| Movement of leaves of sensitive plant | Downward movement of roots |
| \begin{itemize} \item[(i)] Stimulus is touch. \item[(ii)] No growth is involved in the movement. \item[(iii)] Non directional \end{itemize} | Stimulus is gravity. Growth is involved in the movement |
| Directional |
Thyroxine
Thyroid gland
Iodine is necessary for thyroid gland to make thyroxine hormone. Deficiency of iodine in our diet causes goitre.
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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.