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Topic 4 Bioenergetics
4.1 Photosynthesis
4.1.1 Photosynthetic reaction
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What happens in photosynthesis?
1
Light energy
is
absorbed
2 By
chlorophyll
(
pigment
) in
chloroplasts
in
plant
/
algal cells
3 This
energy
is used to
convert carbon dioxide
and
water
into
glucose
(
sugar
) and
oxygen
(
by-product
)
What type of reaction is photosynthesis and why?
Endothermic
reaction -
energy transferred from environment to chloroplast by light
State the word equation
carbon
dioxide
+
water
→
glucose
+
oxygen
Why is this statement wrong?
“Photosynthesis releases energy.”
Photosynthesis absorbs light energy
and uses it to make
glucose.
Why is this statement wrong?
“Photosynthesis is the term given to
respiration in plants.”
Photosynthesis
and
respiration
are
two different processes.
Both happen in
plant cells.
Why is this statement wrong?
“Plants photosynthesise to make oxygen.”
Oxygen
is
made
in
photosynthesis
, but it is
only
a
by-product.
The
aim
of
photosynthesis
is to
make glucose.