Concept: This question tests your understanding of modified roots, specifically the function of prop roots in plants like the Banyan tree.

Why (C) is correct: Prop roots are adventitious roots that grow vertically downwards from the horizontal branches of large trees like the Banyan (Ficus benghalensis). They penetrate the soil and provide additional mechanical support to the massive, spreading canopy of the tree, preventing the branches from collapsing under their own weight.

Why other options are wrong:

• (A) Respiration: Respiration in roots primarily occurs through normal root tissues; prop roots are not specialized for this function like pneumatophores.
• (B) Absorption of water from soil: While prop roots do absorb some water and minerals once they reach the soil, their primary and most significant function is support, not bulk water absorption.
• (D) All of the above: Since options A and B are not the primary functions, this option is incorrect.

Common Mistake: Students might confuse prop roots with other modified roots like stilt roots (for support from the base of the stem) or pneumatophores (for respiration).

NEET Tip / Mnemonic: Remember that 'Prop' means to support or hold up. So, prop roots 'prop up' the tree.

Correct Answer: (C)