A paradigm of fragile Earth in Priestley's bell jar

What is the primary element produced by plants during photosynthesis that is essential for human survival?

• Carbon Dioxide (CO2)

• Oxygen (O2)

• Nitrogen (N2)

• Hydrogen (H2)

Which scientist is credited with discovering the relationship between plant and animal life through experiments involving a mouse and a mint plant?

• Antoine Lavoisier

• Jan Ingenhousz

• Joseph Priestley

• Charles Darwin

What is the role of chlorophyll in the process of photosynthesis?

• It absorbs carbon dioxide from the atmosphere.

• It strips electrons from water molecules using sunlight.

• It releases nitrogen into the atmosphere.

• It converts oxygen into carbon compounds.

Approximately how many years ago did chlorophyll photosynthesis begin to significantly alter the Earth's atmosphere?

• 1,000 million years ago

• 2,400 million years ago

• 500 million years ago

• 3,000 million years ago

What was the atmospheric condition during the early era of chlorophyll photosynthesis?

• High in oxygen, low in carbon dioxide

• Low in oxygen, high in carbon dioxide

• High in nitrogen, low in carbon dioxide

• Low in nitrogen, high in oxygen

Which scientist demonstrated that the process by which plants produce oxygen is dependent upon light?

• Joseph Priestley

• Jan Ingenhousz

• Antoine Lavoisier

• Gregor Mendel

What would happen to a human in a sealed environment without plants, according to the hypothesis mentioned in the text?

• They would thrive due to high oxygen levels.

• They would suffer from severe hypoxaemia.

• They would experience no change in health.

• They would have an increased lifespan.

What is the byproduct of photosynthesis that is crucial for animal life?

• Glucose

• Oxygen (O2)

• Carbon Dioxide (CO2)

• Water (H2O)

What is the main source of energy that drives the process of photosynthesis?

• Chemical reactions

• Sunlight

• Wind energy

• Geothermal heat

What is the fundamental role of photosynthesis in the ecosystem, as highlighted in the conclusion?

• To produce carbon dioxide for plants

• To maintain oxygen levels in the atmosphere

• To generate heat for the Earth

• To create nitrogen for the soil