GCSE Biology - Factors Affecting the Rate of Photosynthesis #49

The video explains photosynthesis and its dependencies on light intensity, temperature, carbon dioxide, and chlorophyll. It discusses how these factors affect the rate of photosynthesis, using graphs to illustrate the concepts. The video also covers how farmers can create optimal conditions for photosynthesis in greenhouses, considering the costs and benefits.

Which of the following is NOT a factor affecting photosynthesis?

• Light intensity

• Soil type

• Temperature

• Carbon dioxide concentration

What happens to the rate of photosynthesis as light intensity increases?

• It decreases continuously

• It decreases and then increases

• It increases and then plateaus

• It remains constant

Why does the rate of photosynthesis plateau at high carbon dioxide levels?

• The plant stops absorbing carbon dioxide

• The plant runs out of water

• Another factor becomes limiting

• The chlorophyll levels decrease

How does temperature initially affect the rate of photosynthesis?

• It stops the process

• It increases the rate

• It has no effect

• It decreases the rate

At what temperature do enzymes involved in photosynthesis become fully denatured?

• 55°C

• 35°C

• 65°C

• 45°C

What is one method farmers use to increase carbon dioxide levels in greenhouses?

• Adding more water

• Pumping carbon dioxide

• Installing fans

• Using electric heaters

What is a potential downside of using greenhouses to optimize photosynthesis?

• Lower temperatures

• Reduced light availability

• Higher costs

• Increased pest infestation