Photosynthesis

1. Photosynthesis
and The Carbon
Cycle
1.
Photosynthesi
s
By Aj. Ahmed

2. Agenda
Introduction
How Plants Make Food
Why Photosynthesis is
Important
Vocabulary
Summary
Assessment 2

3. Introduction
Photosynthesis is the process by which plants make their
own food by using sunlight and water from the soil.
The word photosynthesis can be divided into two words;
‘Photo’ means ‘Light’
‘Synthesis’ means ‘To Make’
So Photosynthesis means ‘Making with Light’
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4. How Plants Make Food

5. In photosynthesis, plants use;
• Water, which they get from the soil.
• Carbon dioxide, which they get from air.
• Energy, which they get from the sun.
5

6. The energy from the sunlight is captured by a green
pigment, called Chlorophyll, which is inside some of the cells
in the leaves of plants,
The plants use the energy to make water and carbon dioxide
combine together in a chemical reaction.
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7. Two new substances are made in the reaction.
These are;
Glucose
Oxygen
You can write the word equation for photosynthesis like this;
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8. Food is simple sunlight in
cold storage.
“ John Harvey Kellogg
”

9. 9

10. Reactants and Products of Photosynthesis
10
Reactants
Water
Sunlight
Carbon dioxide
Site of Reaction
The location of photosynthesis is
is the chloroplast in the leaves.
Products
Glucose
Oxygen

11. Why is Photosynthesis Important?

12. Photosynthesis is important because;
• It provides energy, in the form of chemical energy in
nutrients, for most other organisms.
• Plants make carbohydrates using sunlight.
• All other living organisms depends on plants directly or
indirectly.
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13. In photosynthesis, plants use;
• Most of the energy in the food chain comes from the basic
level of plants.
• Photosynthesis provides OXYGEN for the Earth’s atmosphere
which is necessary for the animals breathing on land so that
they can do respiration.
• Plants also use oxygen for respiration.
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14. Vocabulary
14
1. Photosynthesis
2. Chemical energy
3. Chloroplast
4. Chlorophyll
5. Reactants
6. Products

15. Summary
Photosynthesis is the process of making food by plants using
sunlight.
The reactants for reaction are carbon dioxide and water and products
glucose and oxygen.
This whole process take place during day time in the special
leaves called chloroplast.
Photosynthesis is a very crucial process not just providing energy but
oxygen when is necessary for survival of life on earth.
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16. Assessment
1. What are the reactants for the process of
photosynthesis?
2. What are the products for the process of
photosynthesis?
3. What is the site of reaction for the
process of photosynthesis?
4. If a lizards feeds on a grass hopper, and
grass hopper eat grass. Explain how the
lizard relies on photosynthesis to provide
it with energy?
5. Explain one other reason (apart from
food) why the lizards would not be able
to survive if there were no plants on
Earth?
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17. Thank you