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