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Science · 2025 · 2 marks
CBSE 2025 · Region 6 · Set 1 · Q23
(a) "Proteins control the expression of various characters." Explain this statement by taking an example of "tallness" as a characteristic in plants.
(a)
"Proteins control the expression of various characters." Explain this statement by taking an example of "tallness" as a characteristic in plants.
OR
(b)
Explain the mechanism of inheritance used by sexually reproducing organisms to ensure the stability of DNA of the species.
Marking-scheme solution
The height of plant depends upon amount of particular plant hormone. This hormone depends upon the efficiency of enzyme (protein) which depends upon a DNA sequence (gene). If the enzyme works efficiently, lot of hormones are made and the plant will be tall.
Each cell has two copies of each chromosome, one each from male and female parents. During gamete formation, the gamete takes one chromosome from each pair. When two such gametes having a single set of genes combine together, they restore the normal number of chromosomes in the progeny ensuring the stability of DNA of the species.
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CBSE Class 10 Science past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.