Photosynthesis- Limiting factors Flashcards
How can you measure the rate of photosynthesis?
-Using a capillary tube
-Using a gas syringe
How does a capilary tube measure the rate of photosynthsis?
-The oxygen is collected and measured in a capillary tube
-You can measure the’amount’ of oxygen produced in a certain time
-You can use the scale to measure the length of the oxygen buble produced
What is the equation for the rate of oxygen production?
Pi x radius squared x how long the oxygen bubble is
___________________________________________________
time
What are the units
mm cubed min to the power of -1
What is the function of the syringe?
To pull/move oxygen onto the scale + reset the apparatus
Why is using a gas syringe not as accurate?
Not an exact measure of the rate of photosynthesis because some of the oxygen produced in photosynthesis is used in respiration
Why will the slope increase on some graphs?
The limiting factor is whatever is on the X-axis
-If you increase whatever is on the x-axis the rate of photosynthesis increases
Why did the line on a graph flatten out?
-There is another limiting factor
Why does the rate of photosynthesis decrease after a certain point: Temperature
-Temperature increases so more kinetic energy
-More kinetic energy more collisions
-More collisons= more enzyme-substrate complexes form (form more quickly)
-When the temperature is too high the enzymes start to denature
Why does the rate of photosynthesis decrease after a certain point: Carbon dioxide concentration
-More kinetic energy so more collisions
-CO2 is used in the light-independent reaction as CO2 combines with RUBp to form GP
Why does the rate of photosynthesis decrease after a certain point: Light intensity
-Light is required for the light-dependent reaction
-Light energy is used to excite electrons in chlorophyll and photolysis
