Photosynthesis Flashcards
What is the word equation for photosynthesis?
Carbon dioxide + Water ——> Oxygen + Glucose
What is the symbol equation?
6CO2 + 6H2O ——> 6O2 + C6H12O6
Why is photosynthesis important?
Provides energy
Plants are food for us
It removes CO2 and releases O2
What type of energy is used?
Light energy
What factors effect rate of photosynthesis?
Temperature
No. of chloroplasts
Concentration of CO2
Light intensity
Why can the rate of photosynthesis plateau?
Because another limiting factor is stopping it from increasing
What were the variables of the photosynthesis investigation?
Dependant- No. of bubbles
Independent- Distance of ruler
Control- temperature and pond weed
What happened every time we doubled the distance of the lamp?
We quartered the light intensity
What did we discover about the rate of photosynthesis in the investigation?
The rate of photosynthesis is inversely proportional to the distance of the lamp from the plant
What is the inverse square law?
1/x2
Why is glucose important?
For protein synthesis For growth and repair For respiration For insoluble starch For strengthening cell walls
Why is insoluble starch good?
Because it doesn’t effect the water potential
What do greenhouses have to speed up photosynthesis?
Clear glass
Artificial heat source
Additional CO2
What must happen for the greenhouse to be profitable?
The cost must not exceed additional income it generates
What is transpiration?
The loss of water (evaporation) from the stomata
What process does water and minerals move by?
Transpiration
How do water and minerals enter?
- Mesophyll cells lose water due to evaporation
- Cells now have lower water potential
- Water enters by osmosis
- Water is pulled up the stem via the xylem from the roots to the leaves
When do guard cells open and close?
When they are swollen they open and when they are shrunk they close
What can’t happen if the stomata is closed?
Water can’t evaporate