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AS level biology
Unit 2 Mrs Carne
Gas exchange in plants
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Cards (20)
What is the function of the cuticle in leaves?
Reduces
water
loss
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Why is the cuticle transparent?
To enable light to penetrate to
mesophyll
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What is the role of the upper and lower epidermis in leaves?
Protection
of
tissue
layers
inside
leaf
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Why are the epidermis layers transparent?
To enable
light
to
penetrate
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What is the primary function of the palisade mesophyll?
Maximize
absorption
of light
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Why does the palisade mesophyll have a large number of chloroplasts?
To increase
absorption
of light
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What is the function of the spongy mesophyll?
Gas exchange
within the leaf
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How do spongy mesophyll cells facilitate gas exchange?
By relying on
diffusion
through air spaces
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What is the role of air spaces in leaves?
Gas exchange
for
respiration
and
photosynthesis
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What happens to water vapor in the air spaces?
Evaporates
to maintain water transport
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What is the function of xylem in plants?
Transport of
water
and ions
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What does phloem transport in plants?
Carbon compounds
like
sucrose
and
amino acids
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What is the role of bundle sheath cells?
Support and protection to
vascular bundles
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How do stomatal pores function in leaves?
Site of
gas exchange
with the environment
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What happens to water vapor when stomata are open?
It
is
lost
from
the
stomata
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What is the function of guard cells?
Control the opening and closing of
stomata
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What is the primary function of chloroplasts?
Site of
photosynthesis
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How are chloroplasts involved in stomatal function?
Involved in the
mechanism
for
opening
and
closing
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How do dicot leaves maximize light absorption during the day?
Change
position
to
face
light
Upper
surface
at
right
angles
to
light
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How do chloroplasts adjust to maximize light absorption?
Change orientation in
cells
Allow more light to pass through
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