Pass Check: Plants & Photosynthesis
Photosynthesis, leaf structure, limiting factors, transport and plant responses.
Photosynthesis
The process by which plants and algae use light energy to convert carbon dioxide and water into glucose and oxygen.
Limiting factor
A factor, such as light intensity, temperature or CO₂ concentration, that limits the rate of photosynthesis when in short supply.
Transpiration
The loss of water vapour from a plant's leaves, mainly through the stomata.
Stomata
Small pores, usually on the underside of leaves, that allow gas exchange and control water loss.
Quick check
Mixed quiz
1. What does xylem transport?
2. Where does photosynthesis mainly take place in a plant?
3. Explain why increasing carbon dioxide concentration increases the rate of photosynthesis, up to a point.
4. State how transpiration is defined.
5. Calculate the percentage increase in rate of photosynthesis if the rate rises from 8 to 20 units after adding extra CO2.
6. Explain why a graph of rate of photosynthesis against light intensity plateaus at high light intensities.
7. What is the main job of the roots?
8. State the role of xylem tissue in a plant.