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Plant Physiology > Plant Movements > Flashcards

Plant Movements Flashcards

1
Q

What are tropisms?

A

Directional movements which occur when a plant part grows in a particular direction thanks to cell elongation in plant tissue.

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2
Q

Do tropisms occur slowly or quickly?

A

Slowly, due to the nature of growth movement.

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3
Q

Why might plants grow in a particular direction?

A

Light, temperature, gravity, chemical or physical stimulation.

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4
Q

What is phototropism?

A

A tropism triggered by light.

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5
Q

How do phototropisms occur?

A

Photoreceptors in plant tips perceive blue light and send chemical messages that stimulate auxin production on the side of the plant that isn’t exposed to light.

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6
Q

What is signal transduction?

A

The sending of chemical messages.

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7
Q

How does auxin production cause a curve towards the light?

A

Auxins trigger cell elongation on the side of the shoot not exposed to light, creating a curve.

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8
Q

What is positive phototropism?

A

Growth towards the light.

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9
Q

What is negative phototropism?

A

Growth away from light.

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10
Q

What is thigmotropism?

A

Plant movements displayed in response to touching a solid object.

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11
Q

How fast is thigmotropism?

A

Rapid - enhanced by cells shortening and elongating on one side of a plant.

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12
Q

How does thigmotropism occur>

A

When epidermal cells respond to touch and pressure.

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13
Q

How do cells that touch the solid object respond?

A

They shorten, whilst those on the other side lengthen.

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14
Q

What is positive thigmotropism?

A

Growth of a curve towards an object.

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15
Q

What is negative thigmotropism?

A

Growth away from an object.

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16
Q

Give an example of negative thigmotropism.

A

Plant roots avoiding stones in soil during growth.

16
Q

Give an example of negative thigmotropism.

A

Plant roots avoiding stones in soil during growth.

17
Q

What is geotropism?

A

Tropisms in response to gravity.

18
Q

What is positive geotropism?

A

Growth downwards due to the gravitational pull.

19
Q

What is negative geotropism?

A

Growth away from the gravitational pull.

20
Q

How is it postulated that amyloplasts effect geotropism in plant shoots?

A

It’s postulated that amyloplasts feel thje gravitational pull and gather on one side of a shoot in response, creating pressure.

21
Q

What does this pressure cause?

A

Auxin production, creating upwardly curved growth.

22
Q

How does amyloplast accumulation differ in roots?

A

It inhibits cell elongation, creating a downwards curve.

Plant Physiology (11 decks)

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