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Paper 1
Topic B2-Organisation
Transpiration and stomata
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Created by
Jayce Wynn
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Cards (20)
What is the main topic discussed in the study material?
Transpiration
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What are the four main factors that affect the transpiration rate?
Light Intensity
Temperature
Air Flow
Humidity
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How does light intensity affect the transpiration rate?
The
brighter
the light, the
greater
the transpiration rate.
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What happens to stomata as it gets darker?
Stomata begin to
close
as it gets
darker.
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Why do stomata close in the dark?
Photosynthesis
can't happen in the
dark
, so they don't need to be
open
to let
CO₂
in.
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How does temperature affect transpiration?
The
warmer
it is, the
faster
transpiration happens.
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Why does transpiration increase with temperature?
Water
particles have more
energy
to
evaporate
and
diffuse
out of the
stomata
when it's
warm.
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How does air flow affect transpiration rate?
The
better
the
air flow
around a
leaf
, the
greater
the
transpiration rate.
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What happens to water vapor if air flow around a leaf is poor?
The
water vapor surrounds
the
leaf
and doesn't move
away
, leading to a
high
concentration of
water particles
outside the
leaf.
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How does humidity affect transpiration?
The
drier
the
air
around a
leaf
, the
faster
transpiration happens.
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Why does transpiration happen faster in dry air?
There is a
greater
difference in
concentration
between the
inside
and
outside
of the leaf.
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How can you estimate the rate of transpiration in a plant?
Measure the
uptake
of
water
by the
plant.
Water uptake
is directly related to
water loss
by the
leaves
(
transpiration
).
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What apparatus is used to measure transpiration rate?
A
potometer
is used to measure the
rate
of
transpiration.
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What should be kept constant during the transpiration experiment?
The
temperature
and
humidity
conditions should be kept
constant.
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How are guard cells adapted to open and close stomata?
Kidney
shape allows for
opening
and
closing.
Fill with
water
to become
turgid
and
open
stomata.
Lose
water
to become
flaccid
and
close
stomata.
Thin
outer walls and
thickened
inner walls facilitate
movement.
Sensitive
to light, closing at
night
to save
water.
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Where are stomata usually found in greater numbers on a leaf?
On the
undersides
of
leaves.
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Why are there usually more stomata on the underside of leaves?
The
lower
surface is
shaded
and
cooler
, reducing
water loss.
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How can different leaves be compared for stomata distribution?
Peel
the epidermal tissue off some
leaves.
Mount
them on
microscope slides
for observation.
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Which plant is likely to have fewer stomata per cm² on the underside of its leaves: Aloe vera or primroses?
Aloe vera is likely to have
fewer
stomata due to its adaptation to
hot
,
dry
areas.
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Why might Aloe vera plants have fewer stomata compared to primroses?
Aloe vera plants are
adapted
to conserve
water
in
hot
,
dry
areas.
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