Photosynthesis: Light-Dependent Reactions

The video tutorial by Miss Estri covers the light-dependent reactions of photosynthesis, which occur in the chloroplasts. It explains the processes of photoionization and photolysis, leading to the production of ATP and reduced NADP. The tutorial details how light energy excites electrons in chlorophyll, resulting in ATP synthesis through chemiosmosis and the reduction of NADP to NADPH. The video concludes with a summary of these processes and their significance in photosynthesis.

Where do the light-dependent reactions of photosynthesis take place?

• In the cytoplasm

• In the mitochondria

• On the thylakoid membrane

• In the stroma of the chloroplast

What happens to chlorophyll during photoionization?

• It gains a proton

• It loses an electron

• It releases oxygen

• It absorbs water

What is the main purpose of photolysis of water in photosynthesis?

• To absorb light energy

• To generate oxygen, electrons, and protons

• To release carbon dioxide

• To produce glucose

Which molecule is reduced during the light-dependent reactions?

• ATP

• Oxygen

• NADP

• Glucose

What is the role of the electron transport chain in photosynthesis?

• To excite electrons

• To release oxygen

• To break down glucose

• To transport protons across the membrane

How is ATP synthesized during the light-dependent reactions?

• By breaking down glucose

• Through the Calvin cycle

• Through the action of ATP synthase

• By absorbing light energy

What creates the electrochemical gradient in the chloroplast?

• Movement of electrons

• Absorption of carbon dioxide

• Accumulation of protons in the thylakoid lumen

• Release of oxygen

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

• Water

• NADP

• Oxygen

• Chlorophyll

What is the significance of reduced NADP in photosynthesis?

• It stores energy for the Calvin cycle

• It breaks down glucose

• It absorbs light energy

• It releases oxygen

What is the main product of the light-dependent reactions that is used in the Calvin cycle?

• Glucose

• Carbon dioxide

• ATP and reduced NADP

• Oxygen