Strand : Living World
Sub-strand 1.1: Cell theory and micro-organisms.
Unit 3: Cellular Processes.
Photosynthesis.
Success Criteria: I can
● Define photosynthesis.
● Identify the reactants and products of photosynthesis.
● Identify the parts of plants and their role in photosynthesis.
● Discuss the importance of photosynthesis.
What is photosynthesis?
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Photosynthesis only happens in plants.
It is the process by which green plants transform energy from
light into chemical energy which provides food for the plant.
Each part of the plant has a role to play.
Leaves:
● Have tiny openings called stomata
that allow carbon dioxide in and
oxygen out in a process called gas
exchange.
● Have cell organelles called
chloroplast. Chloroplast contains a
green pigment called chlorophyll
that captures sunlight.
Roots
Bulb and stem.
Store food until it is needed.
Absorb water
from the ground.
How Photosynthesis happens?
❖ Photosynthesis happens when the
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leaves take in carbon carbon
dioxide from the air around them
through their stomata and take in
water through their roots.
The chlorophyll pigment in the
chloroplasts absorbs light to
produce glucose and oxygen.
Glucose is a kind of sugar and an
important form of chemical energy,
which is produced and stored as
food.
Oxygen is released through the
stomata .
Plants use the food produced in
photosynthesis to make new
cells for its growth such as new
leaves,branches ,flowers,roots, longer and bigger stems and even
new plants.
Carbon dioxide and water react with sunlight in the presence of chlorophyll
producing glucose and oxygen.