Question

what is meant by meristematic tissue? how many layer does it have?

Answer 1

Meristematic tissue is like an unprogrammed computer--it is made of cells that haven't been assigned a role within the plant, or undifferentiated cells.
Primary meristematic tissue helps the plant increase in length or vertical growth, meaning it helps the plant grow up toward the sun and down into the soil. Secondary meristematic tissue helps the plant increase the girth or lateral growth of its stems, branches, and roots. Secondary meristematic growth is also responsible for producing the bark on woody trees. 
In monocots, or plants with one seed leaf, primary meristematic tissue is found in the intercalary nodes. The intercalary nodes are located between areas of mature growth, kind of like the joint region on a plant. And in dicots, or plants with two seed leaves, primary meristematic tissues are found in apical regions--the tips of roots, shoots, and leaf and flower buds.

Secondary meristematic tissues are found in all woody plants. 
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Answer 2

Meristematic Tissue is the dividing tissue which is present in the developing regions of the Plants, Based on the region where they are present the layers can be classifies into Apical Meristem, Intercalary Meristem and Lateral Meristem

# Apical Meristem

• It is present at the growing tips of the stem and roots and increases the length of the stem and root

# Intercalary Meristem

• It is present at the base of the leaves or internodes on twigs

# Lateral Meristem

• Present at the side of both the stem and the root.