BIOMOLECULES AND ENZYMES

BIOLOGY

HORMONES

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

Deciduous trees, such as those that lose their leaves in autumn, are a result due to the subjection of which type of plant hormone?

A	Ethylene
B	Ethylene gas
C	Auxins
D	Gibberellins

Explanation:

Detailed explanation-1: -So, the correct answer is ‘Abscisic acid’.

Detailed explanation-2: -Ethylene has an important role in the regulation of leaf senescence. Ethylene is one of the most important hormones in the leaf senescence regulation (Table 1).

Detailed explanation-3: -Ethylene (plant hormone responsible for ripening and senescence), Abscisic acid-ABA (stress hormone), and Auxin (growth hormone) all play a symphony and cause ‘Abscission-falling/separation of leaf tissue’ from the plant.

Detailed explanation-4: -Auxin is a key regulator of plant growth and development, orchestrating cell division, elongation and differentiation, embryonic development, root and stem tropisms, apical dominance, and transition to flowering.

Detailed explanation-5: -Auxin is made in the tip region of the plant stem which is made up of meristematic tissue and this hormone promotes the growth of the plant.

There is 1 question to complete.