Lesson 3
Learning Objective
1. Understand that photosynthesis is the fundamental
process by which plants manufacture carbohydrates
from raw materials
2. State the equations (in words or symbols) for
photosynthesis
3. Understand that chlorophyll traps light energy and
converts it into chemical energy for the formation of
carbohydrates and their subsequent storage
Outline

Photosynthesis
Photosynthesis
What is photosynthesis?
Photosynthesis is the process by which green
plants manufacture carbohydrates from raw material
(carbon dioxide, water, light, chlorophyll)
Photosynthesis
Word equation
Light energy
Carbon dioxide + Water
Glucose + Oxygen + Water
Chlorophyll
Chemical equation
Light energy
C6H12O6 + 6 O2 + 6H2O
6CO2 + 12H2O
Chlorophyll
Chlorophyll
•
•
•
Located in the chloroplast.
Gives the leaf its green colour.
Helps absorbs light energy and convert it into
chemical energy for photosynthesis.
Can photosynthesis takes place in
variegated leaf?
Discussion
Leaf is the plant's main photosynthetic organ. To
serve this function, a leaf must…..
•
allow diffusion of oxygen and carbon dioxide
into and out of it;
•
allow water to be transported into it; and
•
allow sunlight to reach the mesophyll tissues.
•
Brainstorm and list down how a leaf is adapted
for photosynthesis.
–
Think of the structure of the leaf
Leaf Adaptations for Photosynthesis
Learning Objective
1.
2.
3.
Understand that photosynthesis is the
fundamental process by which plants
manufacture carbohydrates from raw materials
State the equations (in words or symbols) for
photosynthesis
Understand that chlorophyll traps light energy
and converts it into chemical energy for the
formation of carbohydrates and their
subsequent storage