The Rate of Photosynthesis

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  • Created by: 12eyoung
  • Created on: 01-06-17 20:34
What effects the rate of photosynthesis?
The intensity or LIGHT, the volume of CO2 and TEMPERATURE (water can become a limiting factor if plant is short of water).
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What does the limiting factor depend on?
The environmental conditions
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What is a limiting factor?
Something that stops photosynthesis from happening any faster.
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What is the limiting factor at NIGHT
Light is the limiting factor
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What is the limiting factor in WINTER
Temperature
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CO2
If it is warm enough and bright enough, CO2 is usually limiting.
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What experiment can you do to see the ideal conditions for photosynthesis?
Count the number of bubbles given off in a given time to see how FAST photosynthesis is happening
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Not enough LIGHT slows down the rate of photosynthesis
1) Light provides the ENERGY needed for photosynthesis 2) As LIGHT LEVEL is raised, rate of photosynthesis INCREASES STEADILY - but only up to a certain point. --> Beyond that, it won't make any difference (temperature or CO2 level will be limiting)
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How can you change the light intensity?
Moving a lamp closer to or further away from plant.
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How to measure the light intensity?
using a LIGHT METER
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Too little CARBON DIOXIDE also slows it down
Will only increase photosynthesis to a point --> graph will FLATTEN OUT showing CO2 is no longer the limiting factor.
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How can you control the amount of CO2?
Dissolve different amounts of SODIUM HYDROGENCARBONATE in water
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TEMPERATURE
1) The temperature has to be just right --> if temperature is the limiting factor, it's because it is too LOW for enzymes to work properly --> photosynthesis works more SLOWLY at low temperatures.
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What happens if the plant gets too hot? (45C)
Enzymes will become damaged
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How can you control the temperature?
Putting the flask in to a WATER BATH
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CONTROL VARIABLES in photosynthesis experiments
1) Keep the light the same distance from plant (to control light intensity) 2) keep flask in a WATER BATH (to keep temperature CONSTANT).
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What is the most common way to artificially create the ideal environment?
Grow plants in a greenhouse
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What do greenhouses do?
1) help TRAP sun's heat 2) makes sure temperature doesn't becoming limiting.
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Greenhouses in winter, summer & when Sun goes down
Gardener can use a heater to keep temperature at ideal level 2) In summer, can use ventilation to cool down temp. 3) Supply artificial light when Sun goes down
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How can farmers increase the level of CO2?
use a paraffin heater
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Other cards in this set

Card 2

Front

What does the limiting factor depend on?

Back

The environmental conditions

Card 3

Front

What is a limiting factor?

Back

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Card 4

Front

What is the limiting factor at NIGHT

Back

Preview of the front of card 4

Card 5

Front

What is the limiting factor in WINTER

Back

Preview of the front of card 5
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