Question

The meristem which develops primary vascular tissue is?

Answer 1

Hint: Meristems are the specialized areas in the plant body that possess the Meristematic tissue. These are the areas of active cell division as the cells present in them keep on dividing to form other cells. The cells produced by the division of Meristematic cells soon lose the capacity to divide and such cells make the plant's body.

Complete answer:
Meristems are the specialized areas in the plant body that possess the Meristematic tissue. They are divided on the basis of:
1. origin or order of appearance in the life of a plant
2. Their position in the body of a plant.
From on the basis of origin in the life of a plant,
(a) Primary apical Meristem: The Meristematic cells that appear early in the life of a plant and contribute to the formation of the primary plant body are called primary Meristems. These cells are always in an active state of division. They form primary permanent tissues.

On the basis of position in the plant:
- They are apical Meristems, Intercalary Meristem and lateral Meristems.
- In vascular plants, apical meristem gives rise to protoderm, procambium and ground meristem. The procambium is called the vascular tissue that is xylem and phloem which helps in the conduction and transport of food, water and other nutrients.
- Under lateral Meristems - fascicular vascular cambium and interfascicular cambium - It increases the girth of the plant.
- Cork cambium, this lateral meristem forms the cork, a tough protective material during the secondary growth.

Thus primary apical meristem develops the primary vascular tissue.

Note: The Meristems that appear later than primary Meristems in the life of the plant and are responsible for producing the secondary tissues, particularly the woody areas, are called secondary Meristems. They are not present from the very beginning of the formation of an organ but develop at a later stage to give rise to other tissues.