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Biology 10 > Plant Control Systems > Flashcards

Plant Control Systems Flashcards

1
Q

environmental factor organism responds to

A

stimulus

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2
Q

reaction to stimulus

A

response

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3
Q

plant response to stimulus

A

tropism

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4
Q

types of tropism

A

phototropism
gravitropism
nastic

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5
Q

phototropism def

A

responding to light

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6
Q

gravitropism def

A

responding to gravity

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7
Q

nastic def

A

responding to touch

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8
Q

positive tropism

A

plant moves toward stimulus

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9
Q

positive phototropism? gravitropism?

A

PP - plant moves toward light

PG - plant moves down

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10
Q

negative tropism

A

plant moves away from stimulus

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11
Q

negative phototropism? gravitropism?

A

NP -plant moves away from light

NG - plant moves up

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12
Q

stems/phototropism

A

positively phototropic

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13
Q

roots/phototropism

A

negatively phototropic

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14
Q

stems/gravitropism

A

negatively gravitropic

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15
Q

roots/gravitropism

A

positively gravitropic

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16
Q

hydrotropism

A

growth of plant roots toward/away from moisture

17
Q

controlled by turgor pressure

A

nastic response

18
Q

why phototropism occurs

A 
stem bends toward light 
leaf gets more sunlight
increased photosynthesis 
more glucose produced
plant grows bigger faster
19
Q

why gravitropism occurs

A 
healthier plant (grows bigger faster)
water + nutrients found deep in soil
roots grow down
20
Q

how phototropism occurs

A

cells grow more elongated on shaded side

cells grow smaller on light side

21
Q

who’s involved in discovery of phototropism

A

Charles Darwin
Boysen-Johnsen
Went

22
Q

Charles Darwin

A

cut off top of stem

found top of stem controls phototropism

23
Q

Boysen-Johnsen

A

found signal produced by tips of seedlings could pass through gelatin but not mica
suggested some type of growth chemical

24
Q

Went

A

cut off top, put agar between top and stem
found top of stem uses chemical to control phototropism
discovered “Auxin”

25
Q

“Auxin”

A

growth hormone

used to make shaded side grow larger cells

26
Q

Auxin experiment?

A

light straight on top - Auxin diffuses down shoot stimulating growth
light to side - Auxin diffuses away from light causing that side to grow larger cells

27
Q

causes cells to grow larger

produced only on shaded side

A

Auxin

28
Q

roots reaction to water

A

positive hydrotropism (toward water)

Biology 10 (14 decks)

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