Photosynthesis and the Calvin Cycle

The video explains photosynthesis, highlighting its importance in producing oxygen and carbohydrates. It covers the two main parts: light reactions and the Calvin cycle. Light reactions involve capturing light energy, while the Calvin cycle focuses on carbon fixation. The video also details chlorophyll's role, chloroplast structure, and the electron transport chain. It concludes with the significance of photosynthesis in sustaining life on Earth.

What percentage of the oxygen we breathe is produced by rainforests?

• 40%

• 30%

• 20%

• 10%

Which organisms are primarily responsible for photosynthesis in the oceans?

• Fish

• Coral

• Seaweed

• Phytoplankton

What does the 'photo' part of photosynthesis refer to?

• Absorption of water

• Production of carbohydrates

• Capture of light energy

• Release of oxygen

Which pigment is primarily responsible for capturing light in plants?

• Anthocyanin

• Xanthophyll

• Carotene

• Chlorophyll

What is the main purpose of the electron transport chain in light reactions?

• To pump protons and create a gradient

• To capture light energy

• To split water molecules

• To produce glucose

What is the role of rubisco in the Calvin cycle?

• To transport electrons

• To capture light energy

• To fix carbon dioxide into organic molecules

• To split water molecules

What is the initial product of the Calvin cycle?

• Glucose

• G3P (Glyceraldehyde 3-phosphate)

• NADPH

• ATP

How many ATP molecules are required to release one G3P from the Calvin cycle?

• 12

• 9

• 6

• 3

What are the main outputs of the light reactions?

• Oxygen, ATP, and NADPH

• ATP and glucose

• Glucose and oxygen

• Carbon dioxide and water

What is the significance of photosynthesis for life on Earth?

• It provides energy for plants only

• It helps in the decomposition of organic matter

• It produces oxygen and organic compounds necessary for life

• It is responsible for the water cycle