Plant hormones Flashcards

1
Q

What is a tropism?

A

A tropism is the response of a plant to a

specific stimulus.

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2
Q

What is phototropism?

A

Phototropism is the response of a plant’s

shoot or root to light.

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3
Q

What is gravitropism?

A

Gravitropism is the response of a plant’s

shoot or root to gravity.

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4
Q

What is auxin?

A

Auxin is a hormone which controls the
growth of a plant’s shoots and roots. When
auxin is unevenly distributed in a growing
plant, the rate of growth will also be unequal.

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5
Q

How do plant shoots show positive

phototropism?

A

● One side of the shoot is in the light, causing auxin to move to the shaded side.

● At the shaded side, the cells are stimulated to grow - the shoot bends towards the light.

● As a result, photosynthesis can occur at a faster rate.

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6
Q

How do plant shoots show negative

gravitropism?

A

● In a horizontal shoot, auxin accumulates in the
lower side due to gravity.

● Cells on the lower side of shoot grow more, causing the shoot to bend away from the direction of gravity.

● As a result, more light is usually available for
photosynthesis.

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7
Q

How do plant roots show positive

gravitropism?

A

● In a horizontal root, auxin accumulates in the
lower side, causing cells to grow less.
● The root bends in the direction of gravity
● As a result, more water and nutrients are
available to the plant roots

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8
Q

What are gibberellins?

A

Gibberellins are a type of plant hormone

involved in seed germination.

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9
Q

What is ethene?

A

Ethene is a type of plant hormone

involved in cell division and ripening

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10
Q

What are the uses of auxins?

A

● Weedkillers - auxin causes cells to grow at a
rapid rate, causing plant death.
● Rooting powder - auxin causes new plant to
grow very quickly.
● Tissue culture - auxin promotes growth of
roots and shoots.

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11
Q

What are the uses of ethene?

A

● Control of food ripening in the food industry -
allows fruit to be ripened just before they are
sold.

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