Concept: This question tests your understanding of specialized root modifications, specifically pneumatophores, and their ecological significance.

Why (A) is correct: Pneumatophores are specialized respiratory roots that grow vertically upwards (negatively geotropic) out of the water or mud. They possess small pores called lenticels through which oxygen diffuses into the submerged root system. These are characteristic adaptations of plants growing in swampy areas, such as mangroves, where the soil is waterlogged and anaerobic (lacks oxygen).

Why other options are wrong:

• (B) plant banyan tree: Banyan trees have prop roots for support, not pneumatophores for respiration.
• (C) plants maize and sugarcane: Maize and sugarcane have stilt roots for support, not pneumatophores.
• (D) plants growing in arid regions: Plants in arid regions (xerophytes) have adaptations to conserve water, not to obtain oxygen from waterlogged soil.

NEET Tip: Remember that pneumatophores are a classic example of adaptation to anaerobic conditions in marshy or swampy habitats, often associated with mangroves.

Correct Answer: (A)