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Ap biology > Chapter 27: Control Of Growth And Response In Plants > Flashcards

Chapter 27: Control Of Growth And Response In Plants Flashcards

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AP® Biology flashcards Biology 101 flashcards
0
Q

stimulus from one direction

A

Result in uneven growth

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1
Q

Tropisms

A

Results in growth

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2
Q

Positive tropism

A

Toward stimulus

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3
Q

Negative tropism

A

Away from stimulus (sun)

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4
Q

Mechanism:

A

Reception- transduction - response

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5
Q

Phototropism

A

Light reaction by buds or stem

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6
Q

Pigment

A

Photoreceptor

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7
Q

Hormone auxin

A

Redistributed to shaded side of shoot, causes uneven growth

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8
Q

Geotropism (gravitropism)

A

Response to gravity

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9
Q

Shoots grow up

A

Negative geotropism

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10
Q

Roots grows down

A

Positive geotropism

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11
Q

Root cap contains

A

Statolith

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12
Q

Amyloplast settles to bottom of cell, then…

A

ER to realeae ca2+ —> auxin release and stimulates growth

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13
Q

Auxin:

A

Inhibits root cells -> growth top- downward movemet

Stimulates stem cells-> growth bottom- upward movement

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14
Q

Shoots that grow horizontal

A

Auxin moves to lower side causing elongation (stolons, strawberries)

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15
Q

Thigmotropism

A

Coiling or in response to touch- requires atp

16
Q

Thigmomorphogenesis

A

More wind stimulation- less growth

Caused by increase in ethylene-> inhibits growth

17
Q

Hydrotropism

A

Response to water by the roots. Roots grown down toward water source

18
Q

Thermotropism

A

Response by the shoot system to hear

19
Q

Excessive heat causes

A

The stomata to close

20
Q

Seismonastic movements or rapid leaf movements

A

Loss of turgor pressure at the petiole base of some plants from touch or wind. K+ pumped out along with water

21
Q

Mimosa plant

A

Touching leaves causes protons to leave and cause water to leave. (Seismonastic movements)

22
Q

Nyctinastic movements

A

In the evening leaflets fold together and the whole leaf droops downward until sunrise. Movements guided by circadian rhythm

23
Q

5 major plant hormones:

A
  1. Auxin
  2. Cytokins
  3. Ethylene
  4. Abscisic acid
  5. Gibberellins

1 minor plant hormone is oligosaccharins

Ap biology (3 decks)

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