Photosynthesis - practical

Question 1

What is photosynthesis equation?

Answer 1

6CO2 + 6H2O → C6H12O6 + 6O2

Question 2

What is photosynthesis word equation?

Answer 2

Carbon dioxide + water → glucose + oxygen

Question 3

What are the factors that affect the rate of reaction?

Answer 3

Temperature, light intensity, carbon dioxide levels, water, oxygen and chlorophyll

Question 4

Why is LED light used in this practical ?

Answer 4

These don’t release much heat

Question 5

What are the steps of the photosynthesis practical ?

Answer 5

1) Start by taking a boiling tube and place it 10cm away from LED light source
2) Now fill the boiling tube with sodium hydrogen carbonate solution - This releases CO2 which is needed for photosynthesis
3) Place pond weed into the boiling tube
4) Leave for 5 minutes to acclimatise to conditions in boiling tube - Bubbles of gas (oxygen) should be produced
5) Start stopwatch and count number of bubbles produced in 1 minute
6) Repeat 2 more times and calculate mean number of bubbles produced
7) Repeat all practical again but change distance of light source