The video explores the carbon cycle, focusing on photosynthesis and respiration. It explains how carbon dioxide is absorbed by plants and converted into oxygen and carbohydrates through photosynthesis. Animals obtain carbon by consuming plants or other animals. Respiration is the process of releasing energy by rejoining oxygen with carbohydrates, forming carbon dioxide and water. The video also discusses the role of enzymes and catalysts in these processes and compares respiration to combustion.

What percentage of carbon dioxide is currently in the air?

• 0.28%

• 1%

• 0.4%

• 5%

Tags

NGSS.HS-ESS2-6

What was the carbon dioxide level in the air hundreds of years ago?

• 1%

• 0.28%

• 0.4%

• 5%

What is the primary process by which plants capture carbon?

• Respiration

• Combustion

• Photosynthesis

• Fermentation

Tags

NGSS.HS-LS1-5

NGSS.HS-LS2-5

What role do animals play in the carbon cycle?

• They produce carbon dioxide through photosynthesis

• They capture carbon by eating plants or other animals

• They release oxygen into the environment

• They convert sunlight into energy

Tags

NGSS.HS-LS2-3

NGSS.HS-LS2-6

Why is chlorophyll important for photosynthesis?

• It absorbs sunlight

• It converts energy into sugar

• It produces carbon dioxide

• It helps in capturing oxygen

Tags

NGSS.HS-LS1-5

NGSS.HS-LS2-5

What is the main purpose of chlorophyll in photosynthesis?

• To capture carbon dioxide

• To absorb sunlight

• To absorb water

• To reflect green light

Tags

NGSS.HS-LS1-5

Which organisms were mentioned as the early evolvers of photosynthesis?

• Fungi

• Mammals

• Cyano bacteria

• Insects

What is the significance of enzymes in respiration?

• They reflect green light

• They split water molecules

• They help in breaking down carbohydrates

• They produce carbon dioxide

Tags

NGSS.HS-LS1-7

How do roots and seeds obtain energy?

• By absorbing sunlight directly

• From stored sugars

• Through photosynthesis

• From soil minerals

Tags

NGSS.HS-LS1-7

What is the main difference between respiration and combustion?

• Combustion occurs at normal temperatures

• Respiration uses enzymes

• Combustion releases oxygen

• Respiration requires sunlight

Tags

NGSS.HS-LS1-7