Topic 4 - Bioenergetics Flashcards
What is the equation for photosynthesis?
6CO2 + 6H2O ====> C6H12O6 + 6O2
carbon dioxide) (water) (glucose) (oxygen
What does photosynthesis use to make the products?
Energy
Where does photosynthesis take place?
In the chloroplast in a green plant cell
Why does photosynthesis need to take place where it does?
Because there is chlorophyll present which absorbs light energy needed for the reaction to happen
What type of reaction is photosynthesis?
Endothermic
Name 5 uses for glucose in a plant
1 - For respiration, glucose is converted into other useful substances which release energy
2 - making cellulose for cell walls
3 - combining with nitrate ions to make amino acids which in turn make proteins
4 - stored as fats for seeds
5 - stored as starch for later use when photosynthesis can’t take place and glucose isn’t available
What are the limiting factors of photosynthesis?
CO2, light, temperature and lack of/damaged chlorophyll
How do plants get the energy for photosynthesis?
sunlight is trapped by the chlorophyll
What is meant by an endothermic reaction?
a reaction where energy is transferred from the environment
What effect would magnesium deficiency in a plant have on the rate of photosynthesis?
rate of photosynthesis will decrease as it can cause the chloroplast not to make enough chlorophyll which means less sunlight is absorbed
What does a rate of photosynthesis/light intensity graph look like?
The rate has a steady increase as the light intensity increases and then platous as CO2 or temp becomes a limiting factor
What does a rate of photosynthesis/CO2 graph look like?
The rate has a steady increase as the level of CO2 rises and then plateaus as light or temp becomes the limiting factor
What does a rate of photosynthesis/temperature graph look like?
The rate steadily increases until about 45 degrees where the line decreases rapidly as the optimum temp has been surpassed and the enzymes become denatured
