Photosynthesis Mastery Quiz

What is the primary function of the light-dependent reactions in photosynthesis?

• To produce glucose

• To convert ADP into ATP and NADP+ into NADPH

• To fix carbon dioxide into organic molecules

• To break down water molecules

Answer explanation

The primary function of the light-dependent reactions in photosynthesis is to convert ADP into ATP and NADP+ into NADPH.

During the Calvin cycle, what molecule is used as the carbon source for synthesizing organic compounds?

• Oxygen

• Glucose

• Carbon dioxide

• ATP

Answer explanation

During the Calvin cycle, the molecule used as the carbon source for synthesizing organic compounds is carbon dioxide.

In which part of the chloroplast do the light-dependent reactions take place?

• Stroma

• Thylakoid membrane

• Outer membrane

• Granum

Answer explanation

The light-dependent reactions take place in the thylakoid membrane of the chloroplast, where the photosystems and electron transport chain are located.

Which of the following is NOT a photosynthetic pigment?

• Chlorophyll a

• Chlorophyll b

• Carotenoids

• Hemoglobin

Answer explanation

Hemoglobin is not a photosynthetic pigment, as it is a protein found in red blood cells, while the other options are all pigments involved in photosynthesis.

What is the overall equation for photosynthesis?

Answer explanation

The overall equation for photosynthesis is 6CO2 + 6H2O → C6H12O6 + 6O2, which is the first answer choice.

Which factor does NOT affect the rate of photosynthesis?

• Temperature

• Light intensity

• Oxygen concentration

• Carbon dioxide concentration

Answer explanation

Oxygen concentration does not affect the rate of photosynthesis, as it is a product of the process and not a factor that influences it.

What is the role of NADPH in the Calvin cycle?

• It acts as a primary electron donor.

• It provides energy in the form of ATP.

• It supplies high-energy electrons for carbon fixation.

• It captures light energy.

Answer explanation

NADPH supplies high-energy electrons for carbon fixation in the Calvin cycle.

Where in the chloroplast is the Calvin cycle located?

• Thylakoid membrane

• Stroma

• Outer membrane

• Granum

Answer explanation

The Calvin cycle is located in the stroma of the chloroplast.

What is the significance of water in photosynthesis?

• It is the primary source of carbon.

• It provides electrons to replace those lost by chlorophyll.

• It acts as the primary light-absorbing molecule.

• It is the end product of the Calvin cycle.

Answer explanation

Water provides electrons to replace those lost by chlorophyll, which is the significance of water in photosynthesis.

Which of the following is a product of the light-dependent reactions?

• Glucose

• Carbon dioxide

• Oxygen

• G3P (Glyceraldehyde-3-phosphate)

Answer explanation

Oxygen is a product of the light-dependent reactions in photosynthesis.