1. Photosynthesis

2. Autotrophs
Plants and some other types of organisms that contain chlorophyll are able to use light energy from the sun to produce food. 2

3. Autotrophs include organisms that make their own food
Chloroplast
Autotrophs include organisms that make their own food
Autotrophs can use the sun’s energy directly
Euglena
Plant or animal?
Flagella 3

4. Heterotrophs
Heterotrophs are organisms that can NOT make their own food
Heterotrophs can NOT directly use the sun’s energy 4

5. Quick Review
Heterotrophs ? ?
Autotrophs

6. Photosynthesis
Involves the Use Of light Energy to convert Water (H20) and Carbon Dioxide (CO2) into Oxygen (O2) and High Energy Carbohydrates (sugars, e.g. Glucose) & Starches
STOMATA 6

7. equation for photosynthesis.
State the overall
equation for photosynthesis.

8. The Photosynthesis Equation
Carbon
Dioxide
Glucose
Oxygen
WATER 8 8

10. Plant Cells Structures Review

12. Chloroplasts Organelle found in the leaves of green plants
Two main functions:
Produce food (glucose) during photosynthesis, and to store food energy (starch)

13. Chloroplasts

15. Light
Dark

17. There are two main types of chlorophyll: chlorophyll a chlorophyll b
The main pigment in plants is chlorophyll which is found in the Chloroplasts.
- Chlorophyll: Pigment required to absorb the light needed for photosynthesis
There are two main types of chlorophyll:
chlorophyll a
chlorophyll b 17

18. What makes leafs turn color?
Chlorophyll is the green pigment in leaves that converts the energy from the sunlight to produce food.
When fall rolls around there is less sunlight and cooler temperatures.
Therefore, the leaves start to die and the chlorophyll breaks down exposing the other colors.

19. Green light is reflected by leaves, which is why plants look green.
Chlorophyll does not absorb light within the green region of the spectrum.
Green light is reflected by leaves, which is why plants look green.
Photosynthesis requires light and chlorophyll. In the graph above, notice how chlorophyll a absorbs light mostly in the blue-violet and red regions of the visible spectrum, whereas chlorophyll b absorbs light in the blue and red regions of the visible spectrum. 19

20. Review Questions

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1. Organisms that make their own food are called
autotrophs.
heterotrophs.
decomposers.
consumers.
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2. Most autotrophs obtain their energy from
chemicals in the environment.
sunlight.
carbon dioxide in the air.
other producers.
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3. Plants use the sugars produced in photosynthesis to make
oxygen.
starches.
carbon dioxide.
protein.
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4. The raw materials required for plants to carry out photosynthesis are
carbon dioxide and oxygen.
oxygen and sugars.
carbon dioxide and water.
oxygen and water.
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5. The principal pigment in plants is
chloroplast.
chlorophyll.
carotene.
carbohydrate.
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6. The colors of light that are absorbed by chlorophylls are
green and yellow.
green, blue, and violet.
blue, violet, and red.
red and yellow.
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6. The equation shows a summary of the chemical reactions of photosynthesis.
What is missing from the product side of the equation? 
a) 6 carbon atoms
b) 12 hydrogen atoms
c) 12 oxygen atoms
d) 2 water molecules
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28. 7. Which of the following are needed for photosynthesis to take place?
carbon dioxide, water, chloroplasts, light
enzymes, sugar, carbon dioxide, water
water, carbon dioxide, light, enzymes
oxygen, water, sugar, light