B1.4.3 - Factors Affecting Photosynthesis Flashcards
Which factors affect the rate of photosynthesis?
Light intensity
Carbon dioxide
Temperature
What are these factors called?
The limiting factors of photosynthesis
What happens if any of these factors is in short supply?
Photosynthesis is limited
How can you measure the rate of photosynthesis?
Measuring how much oxygen or glucose a plant makes in a given time
How else can you measure the rate of photosynthesis?
You can calculate the increase in biomass over time as glucose is used to produce new cells
How do you calculate the rate if photosynthesis?
Rate = 1/time
What is the equation for rate of reaction for anything?
1/t
How does light intensity affect the rate of photosynthesis?
The higher the light intensity, the faster the rate of photosynthesis. This happens until photosynthesis reaches its maximum rate. In very low light levels or if there is no light, photosynthesis stops.
How does carbon dioxide affect the rate of photosynthesis?
Carbon Dioxide is one of the reactants of photosynthesis. The greater the carbon dioxide concentration, the faster the rate of reaction.
How much of the atmosphere is CO2
0.04%
What is often the most limiting factor?
CO2
What do farmers often do in greenhouses?
They artificially increase the levels of CO2
How does temperature affect photosynthesis?
Photosynthesis is a series of enzyme-controlled reactions. Therefore, the higher the temperature the faster the reactions will occur. However, if the temperature is too high, the enzymes will denature.
