Question

Cytokinin is a type of hormone whose main function is
A.Induction of cell division and delay in senescence
B.To take part in cell division
C.Refer to cell division
D.To cause dormancy

Answer 1

Hint: Cytokinin is a type of phytohormone found in plants in growing and dividing regions like root apices, developing shoot buds, young fruits etc.

Complete step by step answer:
Cytokinin as the name itself suggests that it is related to division of cytoplasm. With auxin, a growth hormone cytokinin also plays a role in division of cytoplasm. Cytokinins present in different types of tissue but predominantly present in the Meristematic tissue. Meristematic tissue is a region of active cell division. This tissue is present at the tip of roots and shoots. They contain cytokinin in large amounts for division. Cytokinin is a hormone that helps in growth of cells also. Permanent tissue also has cytokinin but in small amounts because in permanent tissue there is no cell division.
Cytokinin is a hormone whose main function is induction of cell division and delay in senescence.

So the correct option is (A).

Additional Information:
Function of cytokinin
1.Responsible for the growth of leaves and shoots.
2.Delay senescence.
3.Induce Cell division.
4.It helps in increasing the life of cut shoots, vegetables and fruits.
5.Counteracting apical dominance.
Mostly in root synthesis the adenine type of cytosine is found. Phenylurea types of cytokinin have not been found in plants. Chemically cytokinin are derivative or modified purines, derived from tRNA. Xylem transport cytokinin.

Note:
Cytokinin was discovered by F. Skoog and his co-worker. Cytokinin with auxin also responsible for cell division in a mass of undifferentiated cells. The first natural cytokinin was isolated from unripe maize grains or kernels known as zeatin.