Our planet breath

What surprising fact about plants is revealed in the concept of planetary breathing?

• Plants grow by absorbing water only.

• Plants grow by consuming other organisms.

• Plants build their mass atom by atom from the air.

• Plants grow by absorbing nutrients from the soil.

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Which raw material is essential for photosynthesis to occur?

• Nitrogen

• Carbon dioxide

• Oxygen

• Sulfur

What is the waste product of photosynthesis that is vital for animals?

• Nitrogen

• Water

• Carbon dioxide

• Oxygen

What major change occurred in Earth's atmosphere around 2.5 billion years ago?

• The air became rich in nitrogen.

• Photosynthesis began producing oxygen as waste.

• Respiration evolved before photosynthesis.

• Carbon dioxide levels dropped significantly.

What does the annual up-and-down wiggle in atmospheric CO2 data represent?

• The migration of animals.

• The Earth's rotation.

• The seasonal growth and dormancy of plants.

• The movement of tectonic plates.