In experiments using eg Canadian pondweed, you can immerse the green weed in sodium hydrogencarbonate solution to supply the carbon dioxide (one variable) needed for photosynthesis. The other two photosynthesis rate variables are temperature and light intensity.

1. N A M E - K A P I L S H A R M A
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Experiments on factors
affecting rate of Photosynthesis

2. Rate of photosynthesis
 Describe how much sugar a plant can produce over
time.
• It describes how productive a plant is under various
conditions.

3. Light Intensity
 High intensity light causes the rate of photosynthesis
to increase.
 The rate will increase until it reaches its saturation
point.
 At the saturation point,the rate of photosynthesis
remains constant .

4. Photosynthesis Light Response Curve

5. Temperature
 As the temperature increases ,so does the rate of
photosynthesis.
 Enzymes function at an optimal temperature.
 If the temperature is too high or too low,then the
enzymes will not function properly.
 The rate of photosynthesis will slow down or
stop,entirely.

6. Effect of Temperature On Photosynthesis

7. Water
 Water is one of the raw materials of photosynthesis.
 A shortage of water can slow or even stop
photosynthesis.
 Water stress causes stomata to close,preventing CO2
from entering the leaf .

8. Photosynthetically Active Radiation

9. Corbon Dioxide (CO2) Concentration
 An increase in CO2 concentration causes the rate of
photosynthesis to increase.
 More CO2 available means more sugar being made
in the light independent reaction.

10. C3 Plants…….C4 Plants

11. THANKS FOR READING
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