A root cap is not found in the root of

The correct option is Epiphytic roots.

Step-by-Step Explanation:
1. Understanding the Root Cap:
A root cap is a protective, multicellular tissue cover present at the apex of a plant root. It serves to protect the delicate growing tip (apical meristem) of the root as it pushes through abrasive soil particles. It also plays a key role in gravity perception (gravitropism).

2. Analyzing the Options:
• Stilt root of Pandanus: These are adventitious roots that grow into the soil to support the plant. Because they penetrate the soil, they require a well-developed, often multi-layered root cap for protection.
• Seminal roots: These are embryonic roots that grow underground during seed germination. Since they grow through the soil, they possess root caps.
• Hanging prop root of Banyan: These aerial roots grow downwards and eventually enter the soil to support the massive branches of the Banyan tree. They are protected by root caps at their tips.
• Epiphytic roots: Epiphytes are plants that grow on other plants (like trees) for physical support but do not obtain nutrients or water from them. Epiphytic roots (such as those in orchids) hang freely in the air rather than penetrating the soil.

3. Why Epiphytic Roots Lack a Root Cap:
Since epiphytic roots are aerial and do not encounter abrasive soil particles, they do not require a protective root cap. Instead, they are typically covered by a specialized, sponge-like multi-layered epidermis called velamen, which helps absorb moisture and nutrients directly from the atmosphere.

Therefore, a root cap is not found in the root of epiphytic roots.