Which process is not directly affected by auxin? a. Apical dominance b. Leaf abscission c . Synt

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Which process is not directly affected by auxin? a. Apical...

Key Concepts

Leaf Abscission

Leaf abscission is the process by which plants shed their leaves, often in response to seasonal changes or stress. Auxin is involved in regulating the timing and formation of the abscission zone. Changes in auxin concentration can trigger the separation of the leaf from the plant, ensuring that older or damaged leaves are discarded.

Root Initiation

Root initiation involves the formation of new root tissues, a process that is heavily influenced by auxin levels. High concentrations of auxin in certain regions of the plant stimulate the cell division and differentiation necessary for the development of lateral or adventitious roots, which are essential for water and nutrient uptake.

Auxin

Auxin is a major plant hormone that regulates a wide range of growth and developmental processes. It influences cell elongation, apical dominance, root initiation, and contributes to the formation of gradients essential for directional growth responses. Its distribution within plant tissues is key to its function, affecting how cells expand, divide, and differentiate.

Apical Dominance

Apical dominance is a growth pattern in which the main, central stem of the plant is dominant over side stems. This phenomenon is regulated by auxin, which is synthesized at the shoot tip and transported downward, inhibiting the outgrowth of lateral buds and thus ensuring the prominence of the main stem.

Cell Elongation

Cell elongation is a process by which plant cells expand in size, contributing to the overall growth of the plant. Auxin plays a critical role in this process by loosening the cell wall, thereby allowing the cells to enlarge. This action facilitates various growth responses such as phototropism and gravitropism.

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