Question

Natural cytokinins are synthesized in tissue that is
A. Senescent
B. Dividing rapidly
C. Storing food material
D. Differentiating

Answer 1

Hint: Cytokinin is a plant hormone that is involved in different physiological processes. It promotes cell division in plants. It is present in regions where cell division is continuous.

Complete answer: Cytokines is a growth-promoting hormone. Roots are considered as the major source of Cytokinin synthesis. From the roots, it passes in the upward direction through the xylem. Further, it is passed into the leaves and fruits where they are required for natural cell growth. It increases cell division by stimulating the process of mitosis. Increased mitosis results not only in the plant growth and the formation of shoots and buds but the development of seeds and fruits as well. During the cytokinins synthesis cell division occurs in the growing embryos, developing seeds and endosperms of seeds. Cytokinins are not only produced by all types of plants but it is also produced by prokaryotic and eukaryotic organisms such as bacteria, fungi and insects. Moreover, Cytokinins have been implicated in a number of aspects of plant growth and development. The ratio of cytokinin to auxin determines the type of organ regenerated. Cytokinin to auxin ratio usually produces many shoots and few roots.
Therefore, the correct answer is option B.

Note: Natural cytokinin is usually derived from adenine. Adenine is the parent compound of naturally occurring cytokinins, though it does not activate cytokinin response. They are involved primarily in cell growth and differentiation, but also affect apical dominance, axillary bud growth, and leaf senescence.