The Rate Of Photosynthesis Flashcards
What is photosynthesis affected by?
Intensity of light
Volume of CO2
Temperature
What is a limiting factor?
Something that stops it happening any faster
What affect does light have on photosynthesis?
Light provides the energy needed for photosynthesis
As light level is raised, rate of photosynthesis increases but only to a certain point then it won’t make a difference because something else will become the limiting factor
What affect does carbon dioxide have on photosynthesis?
The amount of CO2 will only increase the rate of photosynthesis to a point after this the graph flattens out showing CO2 is no longer the limiting factor
What is one way to control the amount of CO2?
Dissolve different amount of sodium hydrogencarbonate in water which gives off CO2
Why is temperature sometimes the limiting factor of photosynthesis?
If it’s too low then the enzymes needed for photosynthesis work slowly at a low temperature
If it’s too hot (45) enzymes needed for photosynthesis and other reactions may become denatured
What do greenhouses do?
Trap the suns heat to ensure temperature doesn’t become limiting
Often have artificial light for more photosynthesis time
Farmers can increase the level of carbon dioxide
What experiment can be done to work out ideal conditions for photosynthesis?
Using Canadian pondweed you can easily measure the amount of oxygen being produced in a given time to show rate of photosynthesis
(Count bubbles or measure gas in syringe)
How can you change light intensity in a lab?
My moving the lamp closer or further away from the plant
What is the best was to control temperatures?
Using a water bath
Give one other way in which temperature and carbon dioxide can be controlled in a greenhouse?
Temperature- using shades or ventilation.
Carbon dioxide- use a paraffin heater which makes carbon dioxide as a by product
