2.9 Photosynthesis Quick Quiz

Oxygen is produced during photosynthesis. What is the source of this oxygen inside the plant?

• Air Spaces in the leaf
• CO2
• Glucose
• WATER

Which variable has the least effect on enzyme activity?

• Temperature
• Light Intensity
• pH
• Substrate Concentration

What conclusion can be drawn from examining the action spectrum for a green plant shown below?

• Yellow light is the most effective at promoting photosynthesis.
• Every color of light is equally effective at promoting photosynthesis.
• Light of wavelength 550 nm is least effective at promoting photosynthesis
• Light in the green range is the most effective at promoting photosynthesis

What is the source of the oxygen released into the air as a product of photosynthesis?

• Chlorophyll
• CO2 only
• Water Only
• Both Water And CO2

The photosynthetic activity of desert plants is often reduced in the middle of the day. What is the most reasonable explanation for this fact?

• Enzymes are denatured by the high temperatures
• There is not sufficient water for photosystemI
• Most of the light is reflected by the thick cuticle
• The stomata close to preserve water and gas exchange decreases

 A plant is exposed to increasing light intensity from very dim to bright light, while the carbon dioxide concentration and temperature are kept at an optimum level. What will happen to the rate of oxygen production?

• It will increase exponentially
• It will remain constant
• It will decrease to a minimum
• It will increase to a maximum level