Photosynthesis Light Reactions AP Biology

What is the role of chlorophyll in capturing light energy during photosynthesis?

• Chlorophyll stores light energy

• Chlorophyll produces light energy

• Chlorophyll absorbs light energy

• Chlorophyll reflects light energy

Answer explanation

Chlorophyll absorbs light energy, allowing plants to convert it into chemical energy through photosynthesis.

Tags

NGSS.HS-LS1-5

How is ATP used in the process of photosynthesis?

• ATP is used to provide energy for the synthesis of glucose.

• ATP is used to store excess energy in the process of photosynthesis.

• ATP is not involved in the process of photosynthesis.

• ATP is used to convert glucose into energy.

Answer explanation

ATP is used to provide energy for glucose synthesis in photosynthesis.

Tags

NGSS.HS-LS1-5

The goal of photosynthesis is to:

• Convert light energy into glucose energy

• Use light energy to make oxygen gas

• Convert sugar energy into ATP

• Convert sugar energy into oxygen gas

Answer explanation

Photosynthesis converts light energy into glucose energy.

Tags

NGSS.HS-LS1-5

If the proton (H+) pump in the thylakoid was not working, which molecule could not be made during the light reaction?

• NADPH

• ATP

• Water

• Oxygen gas

Answer explanation

If the proton pump in the thylakoid is not functioning, ATP cannot be produced during the light reaction.

Which of the following is the correct equation for photosynthesis?

• 6CO₂ + 6H₂O --> 6O₂ + C₆H₁₂O₆

• 6CO₂ + C₆H₁₂O₆ + 6H₂O --> O₂

• 6O₂ + 6H₂O --> 6CO₂ + C₆H₁₂O₆

• C₆H₁₂O₆ + 6O₂ --> 6H₂O + 6CO₂

Answer explanation

The correct equation for photosynthesis is 6CO2 + 6H2O --> 6O2 + C6H12O6. This equation represents the process by which plants convert carbon dioxide and water into oxygen and glucose through the use of sunlight.

Tags

NGSS.HS-LS1-5

NGSS.HS-LS2-5

Which of the following statements best represents the relationships between the light reactions and the Calvin cycle?

• The light reactions provide ATP and NADPH to the Calvin cycle, and the Calvin cycle returns ADP, Pi, and NADP+ to the light reactions.

• The light reactions provide ATP and NADPH to the carbon fixation step of the Calvin cycle, and the Calvin cycle provides water and electrons to the light reactions.

• The light reactions supply the Calvin cycle with CO2 to produce sugars, and the Calvin cycle supplies the light reactions with sugars to produce ATP.

• The light reactions provide the Calvin cycle with oxygen for carbon fixation, and the Calvin cycle provides the light reactions with sugars to produce ATP.

Answer explanation

The light reactions provide ATP and NADPH to the Calvin cycle, and the Calvin cycle returns ADP, Pi, and NADP+ to the light reactions.

Tags

NGSS.HS-LS1-5

Electrons become energized during photosynthesis when:

• They are absorbed by water

• They undergo carbon fixation

• They are struck with light energy

• They are incorporated into oxygen

Answer explanation

During photosynthesis, electrons become energized when they are struck with light energy.

Tags

NGSS.HS-LS1-5

A stack of thylakoids is called ________.

• Granum

• Stomata

• Stroma

• Chloroplast

Answer explanation

A stack of thylakoids is called Granum. Thylakoids are membrane-bound compartments in chloroplasts where photosynthesis takes place.

Which of the following molecules is not needed for the Calvin Cycle?

• CO₂

• ATP

• NADPH

• H₂O

Answer explanation

H2O is not needed for the Calvin Cycle because it is not directly involved in the carbon fixation process.

Tags

NGSS.HS-LS1-5

NGSS.HS-LS2-5

Green plants reflect which color of light?

• Red

• Green

• All

• Red and Violet

Answer explanation

Green plants reflect green light.

Tags

NGSS.HS-LS1-5