Photosynthesis and limiting factors

What does the word 'limiting' mean?

• Setting a boundary or restriction
• Unrestricted access
• Decreasing the range
• Expanding the scope

A 'limiting factor' is something that....

• restricts growth, abundance, or distribution of an organism or population within an ecosystem
• is always beneficial for organisms
• has no impact on the environment
• enhances growth in an ecosystem

What is required for photosynthesis to occur?

• Sunlight, nitrogen, and water
• Sunlight, water, and carbon dioxide
• Wind, water, and oxygen
• Heat, oxygen, and carbon dioxide

Which of these is a limiting factor for photosynthesis?

• Carbon dioxide concentration
• Water

• Soil

• Type of plant pot

What does 'optimum' mean?

• An average performance
• The best condition or level for something.

• A mediocre result
• The worst possible outcome

Select the limiting factors for photosynthesis.

• Wind speed
• Soil pH
• Humidity
• Light intensity, carbon dioxide concentration, temperature

For CO₂ concentration, initially the rate of photosynthesis increases as the CO₂ concentration increases. However the rate of photosynthesis begins too .... .

• plateau
• decrease
• accelerate
• stabilize

For light intensity, the limiting factors are CO₂ concentration and ......

At the optimum temperature, the rate of ...... is at its highest.

The enzymes in the plant start to .... at temperatures higher than the optimum. This causes the rate of photosynthesis to ...

• Melt, increase
• Stabilize, remain constant
• Activate, fluctuate
• Denature, decrease