PLANT PHYSIOLOGY
PLANT GROWTH
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Gibberellins delay senescence of leaves.
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Gibberellins prevent bolting and are inactivated.
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Auxins prevent leaf drop at early stages.
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Effect of auxins is removed and growth of lateral buds is enhanced.
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Detailed explanation-1: -This is because – Auxin shows apical dominance. Removal of auxin by removal of shoot tips prevents the apical dominance and promotes the growth of lateral buds which is a very useful in tea leaves production.
Detailed explanation-2: -It has been observed that if the shoot tip along with the apical bud sir moved from the plant, the release of auxin hormone reduces. This low concentration of auxin allows the lateral buds to grow and produce new shoots.
Detailed explanation-3: -Reason: Removal of shoot tips usually results in the growth of lateral buds. Q. I. Assertion: The presence of apical bud inhibits the growth of lateral bud, this is called apical dominance.
Detailed explanation-4: -The shoot tip has a special type of tissue called meristem. These tissues divide rapidly and keep growing. Even if the shoot tip is cut, the cells will divide again and grow back.
Detailed explanation-5: -Apical dominance is the term used to describe the control of the shoot tip over axillary bud outgrowth (e.g. Cline, 1997). It is best demonstrated via shoot tip removal (decapitation), which leads to apical dominance. Indeed, decapitation has been widely used to study bud outgrowth.