B1.4 Flashcards
What is the equation for photosynthesis?
Photosynthesis equation:
- Carbon dioxide + water –> glucose + oxygen
- CO2 + H2O –> C6H12O6 + O2
What type of reaction is photosynthesis?
Photosynthesis reaction
- Endothermic
What happens to the glucose produced in photosynthesis?
Glucose in photosynthesis:
- Cellulose for cell wall
- Respiration
- Oils (converted to lipids)
- Amino acids
What is stage 1 of photosynthesis?
Stage 1 of photosynthesis:
- Light dependent stage
- Sunlight hits surface of leaf
- Sunlight will infiltrate to water
- Sunlight will break water molecules into hydrogen and oxygen
What is stage 2 of photosynthesis?
Stage 2 photosynthesis:
- CO2 enters stomata
- Collects in airspaces
- Reacts with hydrogen and oxygen from water to form glucose and oxygen
How to prove light is needed for photosynthesis?
Light for photosynthesis:
- Cover leaf with black foil
- Place plant in light for several hours
- Test for starch
How to prove carbon dioxide needed for photosynthesis?
Carbon dioxide for photosynthesis:
- Place plant in bag
- Use soda lime to mop carbon dioxide
- Leave for several hours and test for starch
How does light intensity affect rate of photosynthesis?
Light intensity:
- Light intensity increases, meaning rate of photosynthesis increases until optimum reached
- After optimum, gradient remains constant
How does carbon dioxide affect rate of photosynthesis?
Carbon dioxide:
- Increase in carbon dioxide means rate or reaction increases
- Gradient slowly straightens
How does temperature affect rate of photosynthesis?
Temperature:
- Rate of photosynthesis low as low kinetic energy driving movement of enzyme
- After optimum, if temp increases, enzymes denature so rate of photosynthesis decreases
What is inverse square law?
Inverse square law:
- Doubling distance from light means light intensity falls by a factor of 4
What is the equation for inverse square law?
Equation for inverse square law:
- Relative light intensity =
1
/
distance from light source 2 (squared)
