Photosynthesis: Light Reactions and the Calvin Cycle

The video explains photosynthesis, a process by which plants convert sunlight, water, and carbon dioxide into energy. It covers the two main stages: light reactions and the Calvin cycle. Light reactions occur in chloroplasts, producing ATP and NADPH, while the Calvin cycle synthesizes organic molecules. The video also highlights the role of chlorophyll in absorbing sunlight and the importance of photosynthesis in the food chain.

What is the primary source of energy for plants?

• Sunlight

• Carbon Dioxide

• Water

• Soil

What are the two main stages of photosynthesis?

• Calvin cycle and Glycolysis

• Electron transport chain and Calvin cycle

• Light reactions and Krebs cycle

• Light reactions and Calvin cycle

Where do the light reactions of photosynthesis occur?

• In the stroma

• In the mitochondria

• In the cytoplasm

• In the thylakoid membranes

What is the role of chlorophyll in photosynthesis?

• It absorbs sunlight

• It stores energy

• It transports water

• It releases oxygen

What molecule is produced as a byproduct of the light reactions?

• NADP+

• Oxygen

• Glucose

• Carbon Dioxide

Which enzyme is responsible for carbon fixation in the Calvin cycle?

• NADP+ reductase

• Phosphofructokinase

• RuBisCO

• ATP synthase

What is the main product of the Calvin cycle?

• G3P

• NADPH

• Oxygen

• ATP