Response - Response to Stimuli: Plant Growth Factors Flashcards

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1
Q

What is a tropism?

A

The growth of a part of a plant in response to a directional stimulus.

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2
Q

What is IAA?

A

Indoleacetic Acid - an auxin which controls plant cell elongation.

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3
Q

Give an example of a plant growth factor.

A

IAA

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4
Q

Are plant growth factors produced in small or large quantities?

A

Small quantities.

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5
Q

What direction is IAA transported in?

A

Away from the the tip of the shoots or roots where it’s produced.

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6
Q

What does the acid growth hypothesis involve?

A

The active transport of hydrogen ions from the cytoplasm into spaces in the cell wall.

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7
Q

What can IAA do to young cell walls?

A

Increase their plasticity.

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8
Q

What does the acid growth hypothesis explain?

A

How IAA can increase the plasticity of young cell walls.

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9
Q

Give 2 types of tropisms that shoots show.

A

Positive phototropism

Negative geotropic

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10
Q

Give 3 types of tropism that roots show.

A

Negative phototropism
Positive geotropism
Positive hydrotropism

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11
Q

What does IAA do in roots?

A

Inhibits cell elongation.

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12
Q

What does IAA do in shoots?

A

Promotes cell elongation.

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13
Q

Describe how IAA causes shoots to be positively phototropic. (6 points)

A
Cells in tip produce IAA
IAA transported evenly down shoot
Light causes IAA to move to shaded side
IAA causes cells to elongate
Cells on shaded side elongate more
Shoot bends towards light
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14
Q

Describe how IAA causes roots to be positively geotropic. (6 points)

A
Cells in tip produce IAA
IAA transported to all sides of root
Gravity causes IAA to move to lower side
IAA inhibits cell elongation
Cells on lower side elongate less
Root bends towards gravity
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