Bioenergentics Flashcards
The word equation for photosynthesis is
Carbon dioxide + water (with light energy)= glucose + oxygen
The symbol equation to photosynthesis is
6CO2 + 6H2O → C6H12O6 + 6O2
Where does photosynthesis take place
In chloroplasts
What type of reaction is photosynthesis
Endothermic
Which molecule has the symbol C 6 H 12 O 6
Glucose
What are the limiting factors that affect the rate of photosynthesis
Light intensity, concentration of CO2 and temperature
What else is a limiting factor of photosynthesis
The amount of chlorophyll in the plant
What are the five ways plants use glucose?
For respiration
Making cellulose
Making amino acids
Stored as oils or fats
Stored as starch
The three important graphs for the rate of photosynthesis are
- Not enough light slows down the rate of photosynthesis
- Too little carbon dioxide also slows it down
- The temperature has to be just right
What happens when the light intensity increases steadily?
It will reach a point where the rate won’t increase because either the CO2 or the temperature levels are too low which is now the limiting factor same for CO2 aswell
What’s the usual reason why temperature is the limiting factor
This is because the temperature is too low and the enzymes needed to work more slowly at lower temperatures
What happens when the temperature is too hot?
The enzymes needed get damaged this usually happens at 45 degrees
Whats the practical that measures the affect of light intensity on the rate of photosynthesis
The Canadian pondweed experiment
What is the first step to the pondweed experiment
- Place a light at a certain distance away from the pond weed
What is the second step to the pondweed experiment
Leave the pondweed to photosynthesis for a set amount of time then collect the oxygen released in a capillary tube
