Photosynthetic reaction & Rate of photosynthesis4.4.1.2 4.4.1.1 Flashcards
What is the word and symbol equations for photosynthesis?
Carbon dioxide + water —> glucose + oxygen
6CO2 + 6H2O —-> C6H12O6 + 6O2
Why do plants need glucose?
C-cellulose for cell walls
R-respiration to release energy
O-oils and fats for storage (insoluble)
P-protein (protein synthesis(made up of amino acids))
S-starch (glucose turns into starch to be stored)
Is photosynthesis exothermic or endothermic and why?
- Photosynthesis is endothermic.
- chloroplasts absorbs light energy
Why are insoluble substances used for storage?
- Does not diffuse away in solution from storage areas
- Does not affect water concentration within cells
How does light intensity affect the rate of photosynthesis (on a graph)?
When the gradient on increase on a graph it means that as light intensity increases, the rate of photosynthesis increases – light is the limiting factor.
When the line on the graph goes flat it means light intensity is no longer the limiting factor as increasing the light intensity has no effect.
What is the optimum temperature for enzymes?
40 degrees
How does temperature affect the rate of photosynthesis (on a graph)?
- As temperature increases so does kinetic energy and the number of successful collisions increasing the rate of reaction
- Optimum temperature, this is when enzyme activity is at its highest
- Enzymes denature (irreversible change to shape the active site)
Enzyme activity decreases.
How does the amount of chlorophyll affect the rate of photosynthesis?
- If a plant is affected by disease or deficiency then there may be less chlorophyll produced
- This will decrease the rate of photosynthesis as it cannot absorb as much light.
How do you calculate rate of reaction using a graph?
rate of reaction on a graph is equal to the gradient of that graph
