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biology - 18 - response to stimuli > Control Of Plant Growth And Movement > Flashcards

Control Of Plant Growth And Movement Flashcards

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1
Q

What is Tropism

A

Growth o part of plant in response to a directional stimulus

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2
Q

Types of tropism

A

Phototropism
Gravitropism

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3
Q

What dos the stimulus govern

A

Direction of growth

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4
Q

What are the chemicals responsible for responses to external stimuli in plants

A

Plant growth factors

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5
Q

What are plant growth factors

A
  • regulate growth in response to directional stimuli
  • not made in specific organs
  • may affect cells that produce them
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6
Q

Name on growth factors

A

Indole acetic acid (IAA)

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7
Q

What group of group of growth hormones is IAA part of

A

Auxin

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8
Q

How does high IAA affect young shoot cells

A

High IAA concentration cell elongation

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9
Q

High IAA concentrations affect cells in young roots

A

High IAA concentration causes inhibition of cell elongation in young roots

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10
Q

What will happen if their is a high concentration of IAA

A

Kills plant and is toxic

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11
Q

What controls the distribution of of IAA

A

Tropisms

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12
Q

What occurs if IAA unevenly distributed

A

Uneven growth of the plants

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13
Q

Explain why shoots show positive phototropism

A
  • IAA diffuses to the shaded side of the shoot tip
  • as IAA diffuses down shoot
  • light causes lateral diffusion Of IAA from light to shaded side
  • more IAA on shaded side mean cells elongate faster than on light side
  • shoot tip bends towards the light = positive phototropism
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14
Q

What type of phototropism are shoots

A

Positive phototropism

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15
Q

What type of phototropism tropism are roots

A

Negative phototropism

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16
Q

Explain why roots show negative phototropism

A
  • accumulation of IAA on shaded side. Inhibits elongation
  • cells on light side of the root elongated faster than those of the shaded side
  • roots bends away from light
17
Q

What does IAA inhibit in roots

A

Growth

18
Q

Explain how roots show positive gravitropism

A
  • gravity causes IAA to accumulate on lower side of the root
  • IAA inhibits elongation of root cells
  • Cells on upper side of the root elongate faster
  • roots tip bends downwards
19
Q

Explain how shoots show negative gravitropism

A
  • more IAA on lower side of shoot
  • cells on lower side elongate faster than those on upper side
  • shoot tip grow upwards
  • opposite direction from force of gravity

biology - 18 - response to stimuli (7 decks)

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