Tropism Flashcards

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1
Q

What is tropism

A

Growth of a plant towards a directional stimulus
Plants do respond to stimuli

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2
Q

What are auxin

A

Plant hormones

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3
Q

Where is auxin produced

A

The the ends / tips of root & shoots

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4
Q

Where is auxin located

A

Dissolves in cell solution
Diffuses backwards and concentrates on the darker & lower side

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5
Q

Difference between auxin in roots and shoots

A

Roots: inhibit growth
Shoots: stimulates growth

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6
Q

What is phototropism
Is it positive or negative negative in shoots and roots
What happens when there’s a unidirectional light
What happens when the light intensit is equal in all directions

A

Growth towards light from 1 direction
Shoots: positive // roots: negative
Stimulate cells to elongate, bend towards the direction of light
Same auxin diffusion rate, equal growth

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7
Q
A

There’s a hormone produced at the tip of the shoot which stimulates bending

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8
Q
A

The hormone causes cells to elongate

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9
Q
A
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10
Q

What are mica sheets and agar block

A

Mica sheet: impermeable to chemicals
Agar blocks: permeable to chemicals

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11
Q

What is geotropism

A

Growth towards gravity

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12
Q

Why are shoots negatively geotropic

A

Grow towards light for photo
For glucose to respire

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13
Q

Why are roots positively geotropic

A

Grows towards soil to obtain water and mineral ions + anchor plant

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