Leaf fall occurs when the content of :-a)Auxin increasesb)Auxin decreasesc)Abscisic acid decreasesd)Gibberellic acid decreasesCorrect answer is option 'B'. Can you explain this answer?

Question

Answer

Due to a reduction in photosynthesis, this may trigger the abscission of leaves (separation of leaves) and this abscission layer is produced when auxin content falls below a minimum causing leaf or other plant part to fall off.CORRECT OPTION IS B.

Answer

Leaf fall occurs when auxin Harmon is decreases because auxin prevent leaf,bud abscisin.

Answer

As that the option B is correct because the absence of auxin inhibit fruit and leaf drop at early stages and they promote the cell division and they help for growth promoting...

Answer

Leaf fall occurs when the content of auxin decreases.

Leaf fall, also known as abscission, is a natural process that occurs in plants during certain seasons or in response to certain stimuli. It is the shedding of leaves or other plant parts from a plant. The process of leaf fall is regulated by various plant hormones, including auxin.

Role of Auxin in Leaf Fall:
- Auxin is a plant hormone that plays a crucial role in various aspects of plant growth and development, including leaf abscission.
- During the growing season, auxin is produced in the leaves and transported downward towards the base of the plant.
- High levels of auxin inhibit the process of leaf abscission, keeping the leaves attached to the plant.
- It promotes cell elongation and prevents the formation of an abscission zone, which is a layer of cells that eventually leads to leaf detachment.
- Auxin also stimulates the production of certain proteins that strengthen the cell walls, further preventing leaf abscission.

Leaf Fall and Decreased Auxin Levels:
- As the seasons change or in response to certain environmental stimuli such as drought or cold temperatures, plants undergo physiological changes that lead to leaf fall.
- One of the key factors involved in leaf abscission is the decrease in auxin levels.
- When auxin levels decrease, it triggers the formation of an abscission zone at the base of the leaf.
- This zone consists of specialized cells that undergo controlled cell separation, leading to leaf detachment.
- The decrease in auxin also results in the activation of genes involved in the synthesis of enzymes that break down cell walls, facilitating leaf abscission.

Other Hormones Involved:
- While auxin is a key regulator of leaf abscission, other hormones also play a role in this process.
- Abscisic acid (ABA) is another plant hormone that is involved in leaf abscission.
- A decrease in ABA levels can also contribute to leaf fall, but it is not the primary factor.
- Gibberellic acid (GA), on the other hand, promotes leaf expansion and growth and is not directly involved in leaf abscission.

In conclusion, leaf fall occurs when the content of auxin decreases. Decreased auxin levels trigger the formation of an abscission zone and activate genes involved in leaf detachment. While other hormones like ABA and GA may have some influence, auxin is the primary regulator of leaf abscission.

Answer

Leaf fall occurs when auxin decreases and abscisic acid increases.auxin prevent abscisin of leaf.

Answer

Due to a reduction in photosynthesis, this may trigger the abscission of leaves (separation of leaves) and this abscission layer is produced when auxin content falls below a minimum causing leaf or other plant part to fall off.

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