4.4.1 Photosynthesis

Question 1

What is the equation for photosynthesis

Answer 1

carbon dioxide + water – light –> glucose + oxygen

Question 2

True or False: Photosynthesis is an exothermic reaction

Answer 2

False. It is an endothermic reaction

Question 3

What are factors that can affect the rate of photosynthesis?

Answer 3

Carbon Dioxide concentration, Temperature, Light Intensity (amount of chlorophyll might not be in the GCSE course)

Question 4

How can each of the three limiting factors be improved by agricultural practices (in greenhouses)?

Answer 4

Carbon Dioxide: Burning of propane produces CO2 in greenhouses
Light: Sunlight gets in through glass, lights switched on at night
Temperature: Greenhouse traps heat energy from sunlight, heating and cooling systems keep greenhouses at optimum temperature, and air circulation system keeps heat evenly distributed