Plant Hormones Flashcards

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1
Q

plant hormones ____ be active at their site of synthesis

A

can

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2
Q

Plant hormones

A

chemicals that are produced by the plant which act as signals that alter growth and/or development

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3
Q

what determines whether a hormone will affect that cell or tissue

A

the sensitivity of the target and concentration of hormones

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4
Q

5 classical plant hormones

A

auxins
cytokinins
gibberellins
ABA (abscisic acid
ethylene

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5
Q

what do auxins do

A

promote stem elongation, root growth, phototropism, and gravitropism (expansion of cells)

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6
Q

what do cytokinins do

A

growth regulators
important for cell division

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7
Q

what do gibberellins do

A

regulators of stem elongation

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8
Q

what do ABA (abscisic acid) do

A

the stress hormone
involved in seed development, maturation, dormancy, and plant stress

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9
Q

what does ethylene do?

A

fruit ripening and senescence

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10
Q

how was hormone function identified

A

by observing the role of the coleoptile tip on blue-light induced phototropism

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11
Q

what is cell expansion caused by

A

increases in turgor pressure/weakening of the cell wall

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12
Q

what are expansins

A

proteins that loosen the hydrogen bonds between cell wall polysaccharides

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13
Q

what hormone makes the plant bend

A

auxin

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