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2.6 Hormones and the control of plant growth

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2.6 Hormones and the Control of Plant Growth
Some words may be used more than once; some may not be used at all.
Auxin
Minerals
Towards
Gravity
Growth
Different
Most
Least
Same
Light
Respond
Away
Lower
Unevenly
Gravitropism Photosynthesis Phototropism
Sensitive
Evenly
Water
How do plants respond to their environment?
Plants are …………………….to their environment and can ………………………..to it.
For plant roots to grow downwards they must grow towards ………………….. which directs it
towards the ……………….. and minerals that the roots need to absorb.
For plant shoots to grow upwards they must grow towards the …………………and against the force
of………………….. This allows them to absorb more light so they can ……………………… as much as
possible.
The response of a plant to light is called……………………..
The response of a plant to gravity is called………………………..
What causes the roots and shoots to grow in a particular direction, to bend?
If one side of a root or shoot grows quicker than the other, the shoot or root will bend
……………….from that area.
If this side
grows quicker
than the other….
It will end up
looking like this
The response of plants to light, gravity and water is controlled by a hormone called ……………..
The auxin affects the rate of ………………. when it becomes …………………..distributed throughout
the roots and shoots and this causes the bending described above when
How does auxin cause the growth of root and shoot to occur in different directions?
A normal young bean seedling is placed on its side in the dark. Auxin is equally spread throughout
the tissues.
Root
Auxin gathers on the
………………. side of the
root.
Shoot
Auxin gathers on the
………………side of the
shoot.
The root grows more
on the side with the
………….. auxin.
This causes the root
to grow downwards
towards the force of
gravity.
The shoot grows more
on the side with the
………….. auxin.
This causes the shoot to
grow upwards
towards the light.
How will you remember this information and not get it confused?
When they have grown up or down, the auxin distributes itself …………….. throughout the tissues so
growth is equal throughout the root or shoot and it grows straight.
2.6 Hormones and the Control of Plant Growth
Some words may be used more than once; some may not be used at all.
Auxin
Minerals
Towards
Gravity
Growth
Different
Most
Least
Same
Light
Respond
Away
Lower
Unevenly
Gravitropism Photosynthesis Phototropism
Sensitive
Evenly
Water
How do plants respond to their environment?
Plants are sensitive to their environment and can respond to it.
For plant roots to grow downwards they must grow towards gravity which directs it towards the
water and minerals that the roots need to absorb.
For plant shoots to grow upwards they must grow towards the light and against the force of
gravity. This allows them to absorb more light so they can photosynthesis as much as possible.
The response of a plant to light is called phototropism.
The response of a plant to gravity is called gravitropism.
What causes the roots and shoots to grow in a particular direction, to bend?
If one side of a root or shoot grows quicker than the other, the shoot or root will bend away
from that area.
If this side
grows quicker
than the other….
It will end up
looking like this
The response of plants to light, gravity and water is controlled by a hormone called auxin. The
auxin affects the rate of growth when it becomes unevenly distributed throughout the roots and
shoots and this causes the bending described above when
How does auxin cause the growth of root and shoot to occur in different directions?
A normal young bean seedling is placed on its side in the dark. Auxin is equally spread
throughout the tissues.
Root
Auxin gathers on the
bottom side of the
root.
Shoot
Auxin gathers on the
bottom side of the
shoot.
The root grows more
on the side with the
least auxin.
This causes the root
to grow downwards
towards the force of
gravity.
The shoot grows more
on the side with the
most auxin.
This causes the shoot
to grow upwards
towards the light.
How will you remember this information and not get it confused?
When they have grown up or down, the auxin distributes itself evenly throughout the tissues so
growth is equal throughout the root or shoot and it grows straight.
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