Photosynthesis AAC

Multiple Choice

What is the main function of the reaction center in a photosystem?

• To absorb photons and transfer energy to the primary electron acceptor

• To split water molecules

• To synthesize ATP

• To transport protons across the membrane

Multiple Select

Which of the following are direct products of the photolysis of water in the thylakoid membrane?

• Electrons

• Oxygen

• NADPH

• ATP

Open Ended

Describe the process by which excited electrons from the reaction center are transferred through the thylakoid membrane.

Multiple Choice

What role does the proton pump play in the electron transport chain of the thylakoid membrane?

• It actively transports H+ ions into the thylakoid space

• It synthesizes ATP directly

• It absorbs photons

• It splits water molecules

Open Ended

Explain how pigments in photosystem I contribute to the electron transport chain.

Multiple Choice

What is the main function of NADP+ in the light reactions of photosynthesis?

• To carry energized electrons and a hydrogen ion

• To split water molecules

• To absorb light energy directly

• To synthesize ATP

Open Ended

Explain how the flow of H+ ions across the thylakoid membrane leads to the production of ATP.

Multiple Choice

Which enzyme is responsible for the formation of ATP from ADP and phosphate during the light reactions?

• ATP synthase

• NADP+ reductase

• Photosystem II

• Rubisco

Multiple Select

Which of the following are products of the light reactions of photosynthesis?

• ATP

• NADPH

• Oxygen

• Glucose

Multiple Choice

In the mechanical analogy for the light reactions, what does the 'mill' represent?

• ATP synthase

• Photosystem II

• NADPH

• Photon

Multiple Select

Which of the following are products of the light-dependent reactions used in the Calvin cycle?

• ATP

• NADPH

• CO2

• O2

Fill in the Blank

The enzyme responsible for fixing carbon dioxide in the Calvin cycle is ___.

Multiple Choice

Which molecule provides the carbon atoms that are fixed during the Calvin cycle?

• CO2

• O2

• H2O

• ATP

Multiple Choice

What is the first stable product formed when CO2 enters the Calvin cycle?

• PGA

• PGAL

• RuBP

• G3P

Open Ended

Explain the role of ATP and NADPH in the Calvin cycle.

Open Ended

Describe how the Calvin cycle leads to the formation of glucose in plants.

Multiple Choice

Which molecule is recycled to restart the Calvin Cycle, and what energy molecule is used in this process?

• RuBP; ATP

• PGA; NADPH

• PGAL; ADP

• CO2; NADH

Open Ended

Summarize the main steps of the Calvin Cycle as shown in the diagram.

Multiple Choice

Which of the following factors can limit the rate of photosynthesis if not present in sufficient amounts?

• Water

• Oxygen

• Glucose

• Nitrogen

Multiple Select

Select all environmental factors that influence the rate of photosynthesis as described in the images.

• Light intensity

• Carbon dioxide concentration

• Temperature

• Soil pH

Fill in the Blank

In photorespiration, ___ replaces CO2 in the reaction with RuBP, leading to a less productive outcome.

Open Ended

Explain the difference between C3 plants and plants that use alternative pathways for carbon fixation.

Open Ended

How does the structure of the thylakoid membrane contribute to the process of photosynthesis?

Multiple Choice

What is the main function of Photosystem II in the thylakoid membrane during the light-dependent phase of photosynthesis?

• To absorb light and initiate the process of photosynthesis

• To produce glucose directly

• To transport oxygen out of the cell

• To break down ATP

Fill in the Blank

Fill in the blank: CAM plants fix CO2 into organic compounds at ___ and release it during the day for the Calvin cycle.

Open Ended

Compare the adaptations of C4 plants and CAM plants for minimizing water loss. How do their mechanisms differ in terms of stomatal behavior and carbon fixation?