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Slide 2

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Explain how guard cells control the
amount of water vapour lost through the
leaf (3 marks)
Guard cells can change their shape to alter the size of
the stomatal pore
This can regulate the amount of water lost through the
leaf
Many plants close their stomata at night to reduce the
loss of water through transpiration…read more

Slide 3

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Explain how water is carried through the
leaves (2 marks)
There is a continuous column of water from the roots to
the leaves through the xylem
Water enters the leaf from the top of the xylem…read more

Slide 4

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On a windy day... (2 marks)
Water is blown away from stomata
This increases the diffusion gradient between the inside
and the outside of the stomatal pore which increases
the rate of transpiration.
This does not happen on still days.…read more

Slide 5

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On a hot day... (2 marks)
Water molecules move away rapidly from the stomata.
This increases the diffusion gradient between the inside
and the outside of the stomatal pore which increases
the rate of transpiration.
On colder days, molecules move more slowly, so the effect
is less.…read more

Slide 6

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On a dry day... (2 marks)
Water molecules move more easily away from the
stomata.
This increases the diffusion gradient between the inside
and the outside of the stomatal pore which increases
the rate of transpiration.
This does not occur on humid days, when water molecules
tend to stay near the stomatal pore, slowing down the rate
of transpiration.…read more

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