Thimble like structure of root is

The thimble-like structure in roots refers to the root cap, also known as the calyptra. This structure is vital for protecting the delicate growing tip of the root as it penetrates the soil.

Here is a detailed explanation of the options provided:

• Root hairs: These are slender, hair-like extensions of epidermal cells. They increase the surface area for water and nutrient absorption but are not thimble-like in shape.
• Lateral roots: These are larger structures that emerge from the pericycle. They help in anchoring the plant and increasing water and nutrient uptake but do not resemble a thimble.
• Root cap (Correct Answer): This cap-like structure is located at the tip of the root. It is made of specialized cells that protect the root's apical meristem as it grows and navigates through the soil. The root cap also secretes mucilage to ease soil penetration and houses the statocytes, which help in gravity perception.
• Apical meristem: This is a region of actively dividing cells located just behind the root cap. While crucial for root growth, it is not cap-like in appearance.

Thus, the thimble-like structure of the root is the root cap, which plays a key role in root growth and protection.