level: 2.9 Photosynthesis
Questions and Answers List
level questions: 2.9 Photosynthesis
| Question | Answer |
|---|---|
| What is photosynthesis? | producing organic molecules from inorganic molecules (carbon dioxide and water) |
| which wavelengths do leaves absorb most? | red and blue |
| which wavelength do leaves reflect? | green |
| What are the different chlorophyll pigments? (4) | carotenoid chlorophyll A chlorophyll B xanthophyll |
| What are the 2 phases of chromatography? | mobile = dissolved in a fluid statoinary = passed through static material |
| How is RF measured? | distance travelled by component / distance travelled by solvent |
| What are the limiting factors for photosynthesis? how does it plateau and why? (3) | temperature = increases kinetic energy = more collisions if increases too much = enzymes denature light intensity: plateaus after a point because all chlorophyll are saturated and being used CO2 concentration: enzymes for carbon fixation are saturated |
| How has oxygenation of the earth affected oceans, atmosphere and rocks? (3) | oceans - uses up iron to produce FeO2 until oxygen starts building up in the air atmos - used to be anoxic rock: banded iron formation from Fe and oxygen |