Question

Identify the labeled parts in the given image.


i. Root hairs
ii. Region of meristematic activity
iii. Region of elongation
iv. Region of maturation

• A. a-iii,b-ii,c-iv,d-i
• B. a-ii,b-iii,c-i,d-iv
• C. a-iv,b-iii,c-i,d-ii
• D. a-iii,b-iv,c-ii,d-i

Answer 1

The correct option is C a-iv,b-iii,c-i,d-ii

Regions of Root:

Root cap region: The apical part of the root is covered by a structure called the root cap which protects the apex of the root. It secretes mucilage which acts as a lubricant for the root to make its way through the soil. As the root extends further in the soil, the root cap wears out and renews constantly.

Region of meristematic activity or Region of cell division: A few millimeters above the root cap is the region of meristematic cells. The cells in this region are thin-walled with dense protoplasm. These cells divide actively. The meristem at the apex consists of - The outermost layer known as the dermatogen. Its cells mature into the epiblema and root cap. Inner to dermatogen lies the periblem. Its cells mature into the cortex. The central region is called the plerome whose cells mature into stele.

Region of elongation: Here the cells enlarge and elongate to make the root grow in length. The length is about 4-8 mm. It lies next to the meristematic region. The cells in this region are newly formed cells which lose the power of division, hence they elongate rapidly.

Region of maturation: In this region, the newly formed elongated cells differentiate into various tissues. Root hairs are formed in this region.