Question

In a longitudinal section of a root, starting from the tip upward, the four zones occur in the following order:

• A. Root cap, cell division, cell maturation, cell enlargement
• B. Cell division, cell enlargement, cell maturation, root cap
• C. Cell division, cell maturation, cell enlargement, root cap
• D. Root cap, cell division, cell enlargement, cell maturation

Answer 1

The correct option is D Root cap, cell division, cell enlargement, cell maturation

the four zones that occur in a root, starting from the root tip are

• Root cap: The root cap is a section of tissue at the tip of a plant root. It protects the growing tip of the root.
• Cell division: An apical meristem lies behind the root cap and it produces the cells that give rise to the primary body of the plant.
• Area of elongation or enlargement: The cells in this zone stretch and lengthen as small vacuoles with in the cytoplasm fill with water. One or two large vacuoles occupy almost all of the cell volume in fully elongated cells. Cellular expansion in this zone is responsible for pushing the root cap and apical tip forward.
• Area of maturation: The elongating cells complete their differentiation into the tissue of the primary body in this zone. It is easily recognized because of the numerous root hairs that extend into the soil as outgrowths of single epidermal cells.