OBJECTIVE LIFE SCIENCE
DEVELOPMENTAL BIOLOGY
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Gibberelins
|
|
|
Auxins
|
|
|
Cytokins
|
|
|
Etiolations
|
Detailed explanation-1: -Mostly all the cells producing auxin are situated in the apical meristem in the stem. There, this hormone inhibits the growth of lateral buds, and this phenomenon is called ‘apical dominance’. Additional information: Auxins are also responsible for root growth, wilting of leaves, and fruit development.
Detailed explanation-2: -Generally, there are five types of plant hormones, namely, auxin, gibberellins (GAs), cytokinins, abscisic acid (ABA) and ethylene. In addition to these, there are more derivative compounds, both natural and synthetic, which also act as plant growth regulators.
Detailed explanation-3: -The plant hormone auxin is secreted in root apices via phospholipase D2 (PLD2) activity which produces specific population of phosphatidic acid that stimulates secretion of vesicles enriched with auxin.