Question

Cytokinin is predominantly present in
A.Permanent tissue
B.Meristematic tissue
C.Endodermis
D.Cortex region

Answer 1

Cytokinin is a type of hormone found in plants in growing and dividing regions like root apices, developing shoot buds, young fruits, etc. Cytokinesis a name itself suggests that it is related to the division of cytoplasm. With auxin, a growth hormone cytokinins also play role in the division of the cytoplasm.

Complete answer: Cytokinins present in different parts, but we have to find a region where cytokinins present predominantly.
Permanent tissue: They are non-divided tissue that has lost their dividing capacity. The origin of permanent tissue is meristematic tissue. At maturity, meristematic tissue loses its ability to divide and become permanent tissue. Permanent tissue has a small amount of cytokinin.
Cortical region: In plants cortical region is a cortex. Cortex separates the epidermis and vascular tissue. The cortical region or cortex is made up of simple permanent tissue and permanent tissue contains cytokinin in a low amount.
Endodermis: Innermost single cell layer of cortex is known as endodermis. Endodermis cell has a deposited layer of suberin a waxy material that prevents the entry of water. The waxy layer of Siberian is called casparian strips. The endodermis is made up of parenchyma cells and parenchymal cells are a type of simple permanent tissue, so as mentioned above endodermis also contain cytokinin in small amounts.
Meristematic tissue: Meristematic tissue is a region of active cell division. This tissue present at the tip of roots and shoots. They contain cytokinin in large amounts for the division.
Cytokinin predominantly present in Meristematic tissue.
So the correct option is (B).

Additional Information:
The function of cytokinin hormone:
1.Responsible of growth of leaves and shoot.
2.Delay in senescence
3.Cell division

Note: Cytokinin was discovered by Miller et all. Cytokinin with auxin also responsible for cell division in a mass of undifferentiated cells.