04.3 Text A

What is the primary function of thylakoids in chloroplasts during photosynthesis?

• To store glucose
• To maintain charge separation across membranes
• To produce carbon dioxide
• To break down ATP

Which photosystem initiates the light-dependent reactions?

• Photosystem III
• Photosystem I
• Photosystem II
• Both photosystems simultaneously

Tags

NGSS.HS-LS1-5

What happens to water molecules during the light-dependent reactions?

• They combine with carbon dioxide
• They remain unchanged
• They are converted to glucose
• They split into electrons, H+ ions, and oxygen

What is the source of replacement electrons for chlorophyll?

• Carbon dioxide
• NADP+
• ATP
• Water molecules

Where are the photosystems located?

• In the stroma
• In the thylakoid membrane
• In the cell wall
• In the cytoplasm

Tags

NGSS.HS-LS1-5

What is produced as a byproduct when water molecules are split?

• Carbon dioxide
• Glucose
• Oxygen gas
• NADPH

Tags

NGSS.HS-LS1-5

What happens to electrons in Photosystem I?

• They gain energy from light
• They are destroyed
• They become part of water molecules
• They lose all their energy

Tags

NGSS.HS-LS1-5

What is the final electron acceptor in the light-dependent reactions?

• Water
• NADP+
• Oxygen
• Glucose

How does the electron transport chain contribute to ATP production?

• By directly producing ATP
• By pumping H+ ions across the membrane
• By breaking down glucose
• By releasing carbon dioxide

Tags

NGSS.HS-LS1-7

What type of molecules are photosystems primarily composed of?

• Lipids and water
• Nucleic acids
• Chlorophyll and proteins
• Carbohydrates