Science
Assertion (A) : Tallness of a pea plant is controlled by an enzyme.
Reason (R) : The gene for that enzyme makes proteins which help the plant to be tall.
options
- Both A and R are true, and R is the correct explanation of A.
- Both A and R are true, and R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Chemical Coordination in Plants
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Answer
Both A and R are true, and R is the correct explanation of A.
Reason —
Assertion (A) is true because the height (tallness) of a pea plant is influenced by a specific enzyme that helps in the production of growth hormones such as gibberellins. The presence or absence of this enzyme determines whether the plant grows tall or remains dwarf. Thus, tallness is controlled by a gene that governs the formation of this enzyme.
Reason (R) is true because genes contain the instructions to make specific proteins and in this case, the gene produces the enzyme (a type of protein) required for the synthesis of growth hormones. These hormones stimulate cell elongation and division, making the plant tall.
Hence, both A and R are true, and R is the correct explanation of A..
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