What is Photosynthesis?

What differs between photosynthetic pigments?

The wavelengths of light that they absorb

What happens to the wavelengths of light not absorbed by photosynthetic pigments?

They are reflected

Which three factors can limit the rate of photosynthesis?

• Carbon dioxide concentration

• Light intensity

• Temperature

What will the graph of carbon dioxide concentration against rate of photosynthesis look like?

As carbon dioxide concentration increases, rate of photosynthesis increases until another factor becomes limiting and the graph plateaus

What will the graph of light intensity against rate of photosynthesis look like?

As light intensity increases, rate of photosynthesis increases until another factor becomes limiting and the graph plateaus

What will the graph of temperature against rate of photosynthesis look like?

As temperature increases, rate of photosynthesis increases and then decreases

How do farmers overcome light intensity as a limiting factor for the rate of photosynthesis?

By using artificial lighting

How do farmers overcome carbon dioxide concentration as a limiting factor for the rate of photosynthesis?

By reusing carbon dioxide waste

How do farmers overcome temperature as a limiting factor for the rate of photosynthesis?

By keeping greenhouses at specific temperatures