Question

how is growth and development controlled in plants​

Answer 1

Answer:

Plants, unlike animals, do not have specific organs (glands) that produce and secrete hormones. The three phytohormones, auxins, cytokinins and gibberellins, are considered to be the most positive regulators of growth and development, whereas, ABA and Ethylene are considered to be growth the inhibitors or suppressors.

Answer 2

Answer:

Several phytohormones control plant growth and development in response to external signals by regulating cell proliferation and expansion. Some of them control meristem function and organogenesis, which involve the regulation of cell division. Auxin is required for the culture of tobacco BY-2 cells.

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