1What is needed for ideal photosynthesis?
Optimum conditions
2What does high light intensity of a specific wavelength provide?
Energy for the light-dependent reaction
3What wavelengths of light are absorbed by chlorophyll?
Red and blue light
4What happens when light intensity increases?
Rate of photosynthesis increases
5What happens if light intensity is too low?
Rate of photosynthesis slows
6What is the ideal temperature for photosynthesis?
Around 25°C
7What happens if temperature falls below 10°C?
Enzymes become inactive
8What happens if temperature exceeds 45°C?
Enzymes denature
9Why do stomata close at high temperatures?
To prevent water loss
10What is the ideal CO₂ concentration for photosynthesis?
Around 0.04%
11What happens if CO₂ concentration increases to 0.4%?
Rate of photosynthesis increases
12What happens if CO₂ exceeds 0.4%?
Stomata close
13What does water stress do to photosynthesis?
It reduces the rate
14What factors can limit photosynthesis?
Light, temperature, and CO₂ concentration
15What happens when limiting factors are at optimum levels?
Rate of photosynthesis maximizes
16What happens if one factor is suboptimal?
It limits the overall rate
17What is usually the limiting factor during daytime?
Light intensity
18What does the graph of light intensity show?
A plateau at high intensity
19What does the temperature graph show?
An optimum at 25°C
20What does the CO₂ concentration graph show?
A plateau at high CO₂ levels
21How can farmers use knowledge of limiting factors?
To increase plant growth
22How is light intensity controlled in greenhouses?
Using artificial lighting
23How is temperature controlled in greenhouses?
Using heaters or ventilation
24How is CO₂ concentration controlled in greenhouses?
Adding CO₂ to the air
25Why is managing limiting factors important?
To increase crop yield
26What does increased photosynthesis provide for plants?
More glucose for growth