Factors Which Limit Photosynthesis Flashcards
Things like light intensity can affect the rate of photosynthesis- we call them ______ _____.
Limiting factors
Let’s say light intensity is limiting photosynthesis. The only way to increase the rate is to ______ the limiting factor, in this case light intensity.
Increase
True or false
Only 1 factor can limit the rate at any time. It depends on which one is in the shortest in supply.
True
What is the relationship between temperature and photosynthesis?
As temperatures increase so doe photosynthesis. Except temperatures above 40 degrees as enzymes in photosynthesis are being destroyed.
Every plant has an _____ temperature for growth.
Optimum
What is the relationship between carbon dioxide and plants?
The more carbon dioxide you give the plants the more photosynthesis they carry out.
The air contains about ____ carbon dioxide.
0.04%
What are the limiting factors for photosynthesis?(3)
- light intensity
- temperature
- carbon dioxide concentration
Factors that influence the rate of photosynthesis:(4)
- Light Intensity
- Temperature
- CO2 concentration
- Water availability
How does light intensity affect photosynthesis?
It causes the rate of photosynthesis to increase up to the optimal point. After reaching this optimal point, light intensity will have no effect on the rate of photosynthesis.
If light intensity becomes too bright then the ____ close, causing CO2 availability to become a _____ _____ and the process slows down.
Stomata
Limiting factor
What is the ideal temperature for photosynthesis?
20-30C
What happens if the temperature exceeds this range?
Lower: enzymes become inactive
Higher: enzymes denature
What effect does carbon dioxide have on the rate of photosynthesis?
Decrease in CO2 = decrease in rate of photosynthesis
Increase in CO2= increase in rate of photosynthesis
Why does a shortage of water effect the rate of photosynthesis?
A shortage of water will decrease turgor pressure causing the stomata to close, limiting gaseous exchange.
How do greenhouses increase the rate of photosynthesis?
Increase in temperature,light,carbon dioxide concentration and water
How do greenhouses increase temperature?
Using thermostat which controls ventilation and heating systems
How do greenhouses increase light?
Translucent materials and use light meters to measure light intensity
How do greenhouses increase carbon dioxide concentration?
Adding sodium bicarbonate to the soil and pumping CO2 into greenhouse from tanks.
How do greenhouses increase water?
Automated watering systems.
During daylight plants produce more _____ by photosynthesis than they use up. At night plants only produce _____ ______ by respiration.
Oxygen
Carbon dioxide
What is hydrogen carbonate indicator?
It used to measure carbon dioxide levels in aquatic systems.
The indicator is ____ in equilibrium with the atmospheric air. It becomes _____/____ with increased carbon dioxide levels. It changes to ____ when carbon dioxide is removed.
Red
Orange/Yellow
Purple
What does nitrogen help with in plants?
Growth of leaves and stems.
What does phosphorus help in plants?
Healthy roots
What does potassium help with in plants?
Healthy leaves and flowers
