Concept: This question tests your knowledge of modified root structures, specifically those involved in providing mechanical support to large trees.

Why (A) is correct: The hanging structures of a banyan tree are indeed called prop roots. These are adventitious roots that grow vertically downwards from the horizontal branches, penetrate the soil, and provide additional support to the massive canopy of the tree, preventing the branches from breaking under their own weight.

Why other options are wrong:

• (B) Stilt roots: These are adventitious roots that grow obliquely from the lower nodes of the stem, providing support, typically seen in plants like maize and sugarcane.
• (C) Pneumatophores: These are specialized roots that grow upwards from the soil, found in mangrove plants, to facilitate gas exchange in waterlogged, anaerobic soils.
• (D) Root hair: These are microscopic, unicellular extensions of epidermal cells of roots, primarily involved in absorption of water and minerals, not support.

NEET Tip: Remember that prop roots are for 'propping up' large branches, while stilt roots 'stilt' the plant above the ground. Pneumatophores are for 'breathing' in marshy areas.

Correct Answer: (A)