M/J 2018/P12/Q18
The equation for photosynthesis is shown.
6CO2 + 6H2O → 6O2 + C6H12O6
Which statement about photosynthesis is correct?
A It has a negative enthalpy change.
B It is catalyzed by the presence of yeast.
C The products of photosynthesis are oxygen and starch.
D It occurs in green leaves.
Answer: D
Explaination
Green leaves contain green color pigment called chlorophyll which is responsible for photosynthesis in the presence of sunlight. Green leaves take CO2 and H20 from the environment and convert them into simple glucose molecule C6H12O6 and oxygen. Starch is a polysaccharide carbohydrate not a glucose molecule. As photosynthesis is an endothermic reaction, it absorbs heat from sunlight and sign of enthalpy is +ve for endothermic reaction. Sunlight and chlorophyll act as a catalyst help the reaction to become faster.
