Explore Photosynthesis and the Calvin Cycle

Increasing temperature can speed up photosynthesis to a certain point.

• True

• False

Which of the following is a way to increase the rate of photosynthesis?

• Increase oxygen levels

• Decrease CO2 levels

• Increase light intensity

• Decrease water level

Increasing carbon dioxide can increase photosynthesis, but only to a maximum rate because

• There are not enough RuBP molecules

• Oxygen cannot leave fast enough

• Large amounts of CO2 cannot fit in the chloroplast

• Calvin cycle can only go as fast as the light reactions

Rate of photosynthesis ________ as light intensity _________

• increases, increases

• decreases, increases

• increases, decreases

What does NADPH do? 

• carries electrons to the Calvin cycle
• carries electrons to the ETC

Tiny pores on the underside of leaves

• Stroma

• Stomata

• Thylakoids

• Chloroplasts

Main products of the Calvin Cycle

• Oxygen, NADP+, ADP

• Glucose, CO2, ADP

• ADP, NADP+, Glucose

• ATP, NADPH, Oxygen

Which of the following is NOT a reactant of the dark reactions?

• NADPH
• ATP
• Oxygen
• Carbon dioxide

Temperatures that are too high can slow photosynthesis because

• stomata stay open

• enzymes are ruined

• there is not enough CO2

• there is too much water

Plants can close their stomata when the temperature is hot

• To prevent water loss

• To prevent loss of oxygen

• To prevent loss of carbon dioxide

• To bring in more carbon dioxide