Concept: This question tests your understanding of root cap function and its adaptations in different plant habitats, specifically focusing on the absence of a root cap in certain plant types.

Why (C) is correct: Hydrophytes (aquatic plants) typically lack a root cap. The primary function of the root cap is to protect the delicate root apex from abrasion as it pushes through soil. In water, there is no such abrasive force, so the root cap is not needed. Instead, many hydrophytes have a root pocket, which is a loose, thimble-shaped structure that protects the root from decay in waterlogged conditions, but it's not a true root cap.

Why other options are wrong:

• (A) Lithophytes: These plants grow on rocks and require a root cap to protect their roots as they penetrate crevices.
• (B) Xerophytes: These are desert plants that need a well-developed root cap to protect their roots as they grow deep into dry, often hard soil to search for water.
• (D) Mesophytes: These are plants that grow in moderate conditions and possess a typical root cap for protection in soil.

Common Mistake: Students might confuse the root pocket of hydrophytes with a root cap or assume all roots must have a root cap.

NEET Tip: Remember that plant structures are often adapted to their environment. The absence or modification of a structure like the root cap is a classic example of adaptation.

Correct Answer: (C)