Priestly did experiments to prove plants produced oxygen
Nota:
He placed a burning candle in a sealed container and observed that the flame went out after a short time and the candle couldn't be re-lit while in the container. He placed a living plant in the container, The flame went out after a short time, but after a few weeks the candle could be re-lit.
the oxygen produced
in photosynthesis
comes from water
the three
limiting factors
that control the
rate of
photosynthesis
Not enough
light slows
down the rate
of
photosynthesis
Nota:
Light provides the energy needed for photosynthesis. If the light level is raised, the rate of photosynthesis will increase nut only to a certain point. Beyond that, it won't make any difference because then it'll be either the temperature or the CO2 level which is now the limiting factor.
Too little
carbon dioxide slows it
down
Nota:
As with light intensity, the amount of co2 will only increase the rate of photosynthesis up to a point. After this it is no longer the limiting factor.
The temperature has to be just right
Nota:
As the temperature increases, so does the rate of photosynthesis. But if the temperature is too high, the plants enzymes will be denatured so the rate rapidly decreases. This happens at about 45 degrees Celsius. Usually though, if the temperature is the limiting factor it's because it's too low.