Question

Assertion (A): In aquatic plants, large air cavities are present in parenchyma to give buoyancy to the plants to help them float. Reason (R): The parenchyma of stems and roots also stores nutrients and water​

Answer 1

Answer:

In aquatic plants, large air cavities are present in parenchyma to give buoyancy to the plants to help them float. Such a parenchyma type is called aerenchyma. The parenchyma of stems and roots also stores nutrients and water. The flexibility in plants is due to another permanent tissue, collenchyma.

Answer 2

Answer: Assertion and reason both are correct but reason is not the correct explanation of the assertion.  

Explanation:

Parenchyma is a type of simple permanent tissue present in plants whose main function is the storage of various substances like starch, proteins, water etc. in stems and roots.

But in aquatic plants such as hydrilla, parenchyma is modified to Aerenchyma. Due to the presence of air cavities in it, the plants easily float and also get sufficient oxygen for respiration.

Therefore assertion and reason both are correct but reason is not the correct explanation of the assertion.

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