Directions: Choose the correct option:
Assertion (A): Sieve tubes are made up of sieve plates that help in conduction.
Reason (R): Phloem parenchyma gives mechanical support.
A
Assertion(A) is true and reason(R) is false.
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B
Assertion(A) is false and reason(R) is false.
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C
Both assertion(A) and reason(R) are true, but reason(R) is not the correct explanation for assertion.
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D
Both assertion(A) and reason(R) are true and reason(R) is the correct explanation for assertion(A).
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Solution
The correct option is A Assertion(A) is true and reason(R) is false. Correct option: (c) Assertion(A) is true and reason(R) is false
Both sieve tubes and phloem parenchyma are cells of the phloem tissue.
Sieve tubes are elongated, cylindrical, thin-walled cells with perforated ends and form a part of phloem tissue.
They help in the conduction or transportation of substances.
Phloem parenchyma contains living cells with thin cell walls. They mostly help in storage of starch and other organic substances.
Therefore, the assertion is true and the reason is false.