Question

Cytokinin involves
a. Kinetin, zeatin, BAP
b. $GA_3$, IBA, Kinetin
c. Zeatin, $GA_3$, BAP
d. IAA, Zeatin, kinetin

Answer 1

Cytokinins are a set of plant growth substances that encourage cell division, or cytokinesis, in plant roots and shoots. They are principally engaged in cell development and differentiation. It also involves apical supremacy, axillary bud growth, and leaf senescence.

Complete answer:
Kinetin is a kind of cytokinin, a class of plant hormone that encourages cell division. Kinetin averts green plant leaves from turning brown. There is some data that reveals kinetin might prevent age-related changes in human skin by defending the DNA in skin cells from harm and lowering skin water loss.

Zeatin, a cytokinin encourages the growth of lateral buds and when sprinkled on meristems supports cell division to form bushier plants. A synthetic cytokinin that is involved in the enlargement of plants and response development, setting blossoms, and stimulating fruit opulence by stimulating cell division is BAP.

Gibberellic acid aids in enhancing the growth and elongation of cells. Gibberellins have a number of effects on plant expansion. IAA is the chief auxin in plants, regulating development and growth processes such as cell division and elongation, tissue segregation, apical dominance, and responses to light, gravity, and pathogens. The plant hormone named IBA is linked to the auxin family and helps in initiating root formation; the in vitro process is known as micropropagation.

Hence, the correct answer is option (A).

Note: Cytokinins avert yellowing by stabilizing the content of protein and chlorophyll in the leaf and the structure of chloroplasts. For example - kinetin is utilized commercially in the storage of green vegetables to decrease yellowing. In horticultural tissue culture, high auxin and low cytokinin conditions give rise to root expansion. Low auxin and high cytokinin conditions support shoot development.