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The rate of photosynthesis
- The limiting factor depends on the conditions
- 1. which is limiting at a particular time depends on the environment conditions:
- -at night the light is the limiting factor
- -in winter the temperature is the limiting factor
- -if its warm enough and bright enough the amount of carbon dioxide is usually
limiting
- -if its warm enough and bright enough the amount of carbon dioxide is usually
limiting
- -in winter the temperature is the limiting factor
- -at night the light is the limiting factor
- 1. which is limiting at a particular time depends on the environment conditions:
- An experiment can be done to work out the ideal conditions for photosynthesis in a particular plant
- for example you can use a canadian ponweed
- You would measure the amount of oxygen produced in a given time to show how fast photosynthesis is happening
- Oxygen is produced during photosynthesis
- Count the bubbles given off, or to be more accurate collect the oxygen in a gas syringe
- Count the bubbles given off, or to be more accurate collect the oxygen in a gas syringe
- Oxygen is produced during photosynthesis
- You would measure the amount of oxygen produced in a given time to show how fast photosynthesis is happening
- for example you can use a canadian ponweed
- There are three important graphs for rate of photosynthesis
- 1. Not enough light slows down the rate of photosynthesis
- Light= energy needed for photosynthesis. As the light levels
raise the rate of photosynthesis increases but only to a certain point
- Beyond that certain point the amount of light will not make a
difference because it would be the temperature or the CO2 levels which are the limiting factors
- In a lab you can move a lamp closer to the plant to increase the rate of photosynthesis
- If you plot the rate of photosynthesis against the ''distance from the beaker'' you would get a weird
shape graph. To get a a nice smooth curve you either need to measure the light intensity at the
beaker using a light meter or do some maths with the results
- If you plot the rate of photosynthesis against the ''distance from the beaker'' you would get a weird
shape graph. To get a a nice smooth curve you either need to measure the light intensity at the
beaker using a light meter or do some maths with the results
- In a lab you can move a lamp closer to the plant to increase the rate of photosynthesis
- Beyond that certain point the amount of light will not make a
difference because it would be the temperature or the CO2 levels which are the limiting factors
- Light= energy needed for photosynthesis. As the light levels
raise the rate of photosynthesis increases but only to a certain point
- 2.Too little carbon dioxide also slows down the rate of photosynthesis
- CO2 is one of the raw materials for photosynthesis
- CO2 will only increase the rate of photosynthesis to a certain point then it will not longer increase
photosynthesis
- As long as the light and CO2 are available then the limiting factor for photosynthesis is temperature
- There are different ways to control the amount of CO2
- one is to dissolve different amounts of sodium hydrogencarbonate in the water, which gives off CO2
- one is to dissolve different amounts of sodium hydrogencarbonate in the water, which gives off CO2
- There are different ways to control the amount of CO2
- As long as the light and CO2 are available then the limiting factor for photosynthesis is temperature
- CO2 will only increase the rate of photosynthesis to a certain point then it will not longer increase
photosynthesis
- CO2 is one of the raw materials for photosynthesis
- 1. Not enough light slows down the rate of photosynthesis
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