Concept: This question tests your knowledge of plant adaptations, specifically specialized root structures found in different ecological niches.

Why (B) is correct: Pneumatophores are specialized respiratory roots that grow vertically upwards from the main root system into the air. They are characteristic adaptations of halophytes (mangroves) that grow in marshy, saline, and oxygen-deficient soils. These roots have pores called lenticels through which gases are exchanged, allowing the plant to breathe in anaerobic conditions.

Why other options are wrong:

• (A) Carnivorous plants: These plants have adaptations for trapping and digesting insects, not pneumatophores.
• (C) Submerged hydrophytes: These plants live entirely underwater and have adaptations like reduced roots, thin cuticles, and large air spaces (aerenchyma) for buoyancy and gas exchange, but not pneumatophores.
• (D) Free-floating hydrophytes: These plants float on the water surface and have well-developed roots for absorption, but they do not develop pneumatophores.

NEET Tip: Remember that pneumatophores are a key adaptation for plants in anaerobic, waterlogged, and saline environments, primarily mangroves (a type of halophyte).

Correct Answer: (B)