Photosynthesis Light and Dark Reactions

Delia explains the processes of light and dark reactions in photosynthesis. The light reaction occurs in the grana, where chlorophyll captures light energy to split water molecules, forming ATP and releasing oxygen. The dark reaction, or Calvin cycle, occurs in the stroma, using hydrogen atoms to convert carbon dioxide into glucose and water, with glucose stored as starch. The video concludes with a call to action for viewers to engage with the content.

Where does the light reaction in photosynthesis occur?

• Nucleus

• Cytoplasm

• Grana

• Stroma

What is the primary role of chlorophyll during the light reaction?

• To absorb water

• To produce glucose

• To capture light energy

• To release oxygen

What molecule is formed using the energy from excited electrons in the light reaction?

• Glucose

• Oxygen

• NADPH

• ATP

What happens to the hydroxyl ions during the light reaction?

• They produce ATP

• They combine to form water

• They release oxygen

• They form glucose

What is released into the atmosphere as a result of the light reaction?

• Nitrogen

• Carbon dioxide

• Hydrogen

• Oxygen

Where does the dark reaction, or Calvin cycle, occur?

• Nucleus

• Mitochondria

• Stroma

• Grana

What is the main purpose of the dark reaction in photosynthesis?

• To produce oxygen

• To convert carbon dioxide into glucose

• To capture light energy

• To split water molecules

What is the role of hydrogen atoms in the dark reaction?

• To form ATP

• To capture light energy

• To reduce carbon dioxide

• To release oxygen

What is the temporary storage form of glucose in the chloroplast?

• Fructose

• Cellulose

• Starch

• Sucrose

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