Concept: This question tests your understanding of root systems, specifically the definition of adventitious roots and their growth patterns.

Why (C) is correct:

The Assertion states that roots arising from any part of the plant other than the radicle are called adventitious roots. This is the correct definition of adventitious roots (e.g., prop roots of banyan, stilt roots of maize, fibrous roots of monocots).

The Reason states that adventitious roots grow only above the ground. This is false. While some adventitious roots (like prop roots) grow above ground, many others (like the fibrous root system of monocots or adventitious roots from stem cuttings) grow extensively underground. The definition of adventitious roots is based on their origin, not their growth direction.

Why other options are wrong:

• (A) Both Assertion and Reason are True and the Reason is a correct explanation of the Assertion - Incorrect, as the Reason is false.
• (B) Both Assertion and Reason are True but Reason is not a correct explanation of the Assertion - Incorrect, as the Reason is false.
• (D) Assertion is False but the Reason is True - Incorrect, as the Assertion is true and the Reason is false.

Common Mistake: Students often confuse the origin of adventitious roots with their growth direction. Not all adventitious roots are aerial.

NEET Tip: Remember that the primary root system develops from the radicle, while adventitious roots can develop from stem, leaves, or other parts of the plant. Their function can be anchorage, support, absorption, or storage.

Correct Answer: (C)