A hormone delaying senescence isa)Ethyleneb)Auxinc)Cytokinind)None of the aboveCorrect answer is option 'C'. Can you explain this answer?

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Giberrlin should be the answer,it also delay senescence

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Gibberellin should be ans a/c to NCERT
GIBBERELLIN delay senescence
CK delay leaf senescence...

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Answer should be B Gibberellin and  ABA are antagonist to each other for senescence..

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Leaf senescence was delayed by various gibberellins and cytokinins. The results demonstrated that some of the gibberellins (GA4 and GA7) are far more effective in delaying chlorophyll loss than GA3, which is commonly used as a postharvest treatment for Alstroemeria cut flowering stems.

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The literal meaning of senescence is ageing .
Abssicion is the last stage of senescence and we know that it is due to ABA
Cytokinin is the plant hormone that delay aging in plants by increasing the amount of new protein that is made and decreasing the amount of old protein that is demolished.

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I think it should be giberrellins

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Introduction:
Senescence is the process of aging in plants, where cells undergo irreversible changes leading to the deterioration of tissue and ultimately the death of the plant. Hormones play a crucial role in regulating senescence. One hormone known to delay senescence is cytokinin.

Explanation:
1. Senescence and its Regulation:
Senescence is a complex process that involves various physiological and biochemical changes in plants. It is regulated by different hormones, including ethylene, auxin, and cytokinin. Ethylene and auxin promote senescence, while cytokinin delays senescence.

2. Ethylene and Senescence:
Ethylene is a gaseous hormone that promotes senescence in plants. It is produced during various stages of plant development, including fruit ripening and leaf senescence. Ethylene promotes the breakdown of chlorophyll, leading to the yellowing of leaves and other senescence-related changes.

3. Auxin and Senescence:
Auxin is another hormone that promotes senescence in plants. It is involved in various growth and developmental processes, but it also plays a role in senescence. High levels of auxin can accelerate senescence, particularly in leaves.

4. Cytokinin and Senescence:
Cytokinin is a hormone that delays senescence in plants. It is known to maintain the greenness of leaves and promote cell division and growth. Cytokinin inhibits the breakdown of chlorophyll, thus preventing the yellowing of leaves and other senescence-related changes.

5. Mechanism of Cytokinin Action:
Cytokinins exert their anti-senescence effects by regulating gene expression and protein synthesis. They activate specific genes that are involved in delaying senescence and inhibit the expression of genes associated with senescence. Cytokinins also promote the production of antioxidants, which help protect cells from oxidative damage during senescence.

Conclusion:
In conclusion, cytokinin is a hormone that delays senescence in plants. Unlike ethylene and auxin, which promote senescence, cytokinin maintains the greenness of leaves and delays the breakdown of chlorophyll. It exerts its effects by regulating gene expression, protein synthesis, and antioxidant production. Understanding the role of hormones in senescence is important for manipulating plant aging and enhancing crop productivity.

Answer

C

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