Photosynthesis: Crash Course Biology

The video explains photosynthesis, highlighting its importance in converting sunlight, carbon dioxide, and water into glucose and oxygen. It covers the two main reactions: light-dependent and light-independent (Calvin cycle). The structure of plant cells, particularly chloroplasts, is discussed, followed by a detailed look at the light-dependent reactions, including the electron transport chain and the role of photosystems. The Calvin cycle is explained, focusing on carbon fixation and the role of rubisco. The video emphasizes the complexity and significance of these processes in sustaining life on Earth.

What are the basic requirements for photosynthesis to occur?

• Carbon dioxide, oxygen, and glucose

• Oxygen, glucose, and sunlight

• Water, carbon dioxide, and sunlight

• Water, oxygen, and glucose

Which plant structure is responsible for absorbing water and transporting it to the leaves?

• Stomata

• Xylem

• Phloem

• Chloroplast

What is the primary pigment involved in absorbing sunlight for photosynthesis?

• Anthocyanin

• Carotene

• Xanthophyll

• Chlorophyll

What is the role of photosystem II in the light-dependent reactions?

• It produces glucose

• It splits water molecules

• It absorbs carbon dioxide

• It releases oxygen

What is the main purpose of the electron transport chain in photosynthesis?

• To produce glucose

• To generate ATP and NADPH

• To release oxygen

• To absorb sunlight

What is the Calvin cycle also known as?

• Dark reactions

• Water cycle

• Light-dependent reactions

• Oxygen cycle

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

• Rubisco

• ATP synthase

• Cytochrome c

• NADP+ reductase

What is the ultimate product of photosynthesis that plants can convert into various carbohydrates?

• ATP

• NADPH

• G3P (Glyceraldehyde 3-phosphate)

• Glucose

How many G3P molecules are needed to regenerate three RUBP molecules in the Calvin cycle?

• Three

• Five

• Six

• Four

What is the significance of photosynthesis in the context of life on Earth?

• It absorbs all carbon dioxide

• It produces oxygen and organic compounds

• It only benefits plants

• It generates all the energy on Earth