500
A scientist suggests the following method to test if C4 plants are better than C3 plants:
1. take 3 corn plants and 3 grasses of equivalent mass
2. plant them in similar soil inside a container in which CO2 levels can be altered and O2 levels measured.
3. provide each plant with sufficient water as determined by a previous base-line experiment
4. alter the CO2 levels over several values (Low, Normal, High) (each plant is left at the given value for several days) and measure O2 production.
5. use O2 production as a measure of the rate of photosynthesis
identify:
IDV, DV
one constant
one control
one big mistake :)
What is
IDV-CO2, DV-O2
one constant-water, mass, soil
one control-normal CO2 level
one big mistake -should be water stressing the plants, not altering CO2 :P