Question

Cytokinins are known to
A. Inhibit cytoplasmic movement
B. Help in the retention of chlorophyll
C. Influence water movement
D. Promote abscission layer formation

Answer 1

Hint: Cytokinins have a crucial role in growth and development of the plant. It plays a necessary role in the dominant ageing method. Senescence of leaves is delayed once kinin is sprayed to the leaves because it helps in retention of pigment. Hence, it keeps leaves inexperienced for an extended time.

Complete answer:
Cytokinin is sprayed to the leaves as it helps in retention of chlorophyll. Hence, it keeps leaves green for a longer time. The chlorophyll is the green coloured pigment present in leaves where photosynthesis occurs. Cytokinins play an important role in several plant processes, such as cell division, shoot and root growth. They're well-known to control axillary bud growth. Cytokinins were originally outlined as chemicals that induce cell proliferation and trigger callus differentiation to shoot once applied with auxins, however, currently it's well-known that cytokinins play a key role in several aspects of plant growth and development, together with embryogenesis, maintenance of root and shoot meristems. Cytokinins promote RNA synthesis and stimulate supermolecule and catalyst activities in tissues. Kinetin and benzyl-aminopurine square measure the foremost often used cytokinins in plant cell cultures. The Gibberellins are especially accustomed to induce flora formation from foreign embryos shaped in culture.
Hence, the correct answer is option B.

Additional information: Auxin helps cells to elongate, however, it does not work alone. Cytokinins promote cellular division (cytokinesis). They are produced in roots, embryos and fruits, or where there's actively growing tissue.

Note: Other plant growth regulators are auxins, gibberellins, abscisic acid and ethylene. Auxins exhibit stem elongation in plants, gibberellins regulate seed dormancy, germination, etc, abscisic acid plays an important role in the stomatal opening, and ethylene helps in ripening up fruits.