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Carbon dioxide enrichment
Increasing CO₂ concentration around crops to boost photosynthesis
Heaters
Used in glasshouses to raise temperature for faster enzyme activity
Ventilation
Prevents overheating and maintains optimum temperature
Optimum temperature
Temperature at which photosynthesis and enzyme activity are fastest
Limiting factor
Factor that restricts the rate of photosynthesis when in short supply
Photosynthesis rate
Speed at which plants convert CO₂ and water into glucose
Faster growth
Result of increased photosynthesis from higher CO₂ and temperature
Why is CO₂ added to glasshouses?
To increase the rate of photosynthesis
What happens when CO₂ increases?
Plants photosynthesise faster and grow more quickly
Why is temperature increased?
To speed up enzyme reactions involved in photosynthesis
What happens if temperature is too high?
Enzymes denature and photosynthesis decreases
Why is ventilation needed?
To prevent overheating and maintain optimum conditions
Why do farmers control CO₂ and temperature?
To maximise crop yield
What is a limiting factor in photosynthesis?
A factor that restricts the rate when not at optimum
How do heaters help at night?
Maintain temperature when sunlight is absent
Why do commercial growers use both CO₂ and heat?
Together they maximise photosynthesis and growth