Describe the structure of root.

CBSE Class 11-science Answered

Describe the structure of root.

Asked by majhrout | 31 May, 2018, 10:52: AM

Expert Answer

The root is the non-green part of the plant which grows below the ground. It develops from the radicle of the seed.

The following regions are distinguished in a root from the apex upwards:

Root Cap
- It is a thimble- or cap-like structure which covers the tender apex of the root.
- It protects the apex and helps to penetrate deep into the soil.
- The root cap secretes mucilage which helps in the absorption of water and ions.
Region of Meristematic Activity
- It is a few millimeters above the root cap.
- The cells are small, thin-walled with dense protoplasm.
- Cells of this region divide rapidly and add new cells lengthwise.
Region of Elongation
- This zone is proximal to the region of meristematic activity.
- The cells do not divide but elongate and enlarge. Hence, this region is responsible for the growth in length of a root.
Region of Maturation
- This region is proximal to the zone of elongation.
- The cells of this region differentiate into permanent tissues depending on the function they have to perform.
- Some epidermal cells of this region form fine delicate thread-like root hair.
- Root hair help in the absorption of water and minerals.

Answered by Sheetal Kolte | 31 May, 2018, 11:37: AM

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