Co-ordination and response in fLOWERING PLANTS Flashcards

Topic 2 J .2

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1
Q

plants need to be able to grow in response of certain stimuli, what is an example of this

A

in response to light, for photosynthesis

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2
Q

plants need to be able to grow in response of (2)

A

light and gravity

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3
Q

directional growth responses made by plants in response to light and gravity are known as ____

A

tropisms

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3
Q

tropisms are

A

directional growth responses made by plants in response to light and gravity

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4
Q

growth toward stimuli means the tropism is

A

positive

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4
Q

growth away from stimuli means the tropism is

A

negative

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5
Q

a response to light is called

A

a phototropism

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6
Q

a response to gravity is called

A

a geotropism

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7
Q

as shoots grow upwards, away from gravity and towards light,
is the phototropism positive or negative ?
AND
is the geotropism negative or positive

A

phototropism is positive

geotropism is negative

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8
Q

As roots grow downwards into the soil, away from light and towards gravity,
is phototropic response negative or positive ?
AND
is the geotropic response negative or positive

A

geotropic response is positive

phototropism is negative

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9
Q

plants produce plant growth regulators called

A

auxins

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10
Q

what do auxins do

A

coordinate and control directional growth responses such as phototropisms and geotropism

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11
Q

auxin is made where

A

in the tips of growing shoots

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12
Q

where do auxins travel to, and how do they get there

A

down to the region where cell division occurs by diffusion

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13
Q

which part of the shoot is able to grow by cell division and elongation

A

ONLY the region behind the tip of a shoot

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14
Q

auxin stimulates …

A

the cells in this region to elongate

15
Q

the more auxin there is …

A

the faster the cells will elongate and grow

16
Q

If light shines all around the tip, auxin is distributed

A

evenly throughout

17
Q

If light shines all around the tip, cells in the shoot grow at (rate)

A

the same rate

18
Q

When light shines on the shoot predominantly from one side, the auxin produced concentrates where

A

on the shaded side, making the cells on that side elongate and grow faster than the cells on the sunny side

19
Q

unequal growth on either side of the shoot due to unequal light coverage causes shoot to ____ and grow in the direction of _____

A

bend

light