B7b/C9 Fit

• Biology
• Upper Secondary (Key Stage 4)
• GCSE

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What is the equation for photosynthesis?

Glucose

Oxygen

Carbon dioxide

water

What was the source of oxygen in the Earth's early atmosphere?

1. Volcanic activity
2. Photosynthetic bacteria
3. Meteor impacts
4. Photosynthetic organisms

Which gas was most abundant in the Earth's early atmosphere?

1. Water vapor
2. Carbon dioxide
3. Oxygen
4. Nitrogen

What gases were present in the Earth's early atmosphere?

1. Nitrogen
2. Water vapor
3. Oxygen
4. Carbon dioxide

What role did volcanoes play in the early atmosphere?

1. They released gases that contributed to the formation of the early atmosphere
2. They formed the Earth's oceans
3. They created the first plants and animals
4. They caused the extinction of dinosaurs

Define global warming?

Put the stages of global warming in order

Step 1

Step 2

Step 3

Step 4

Radiation from the sun enters the earths atmosphere

the earth absorbs short wave radiation and warms up. The earth radiates infra red radiation

Some of the infrared radiation is absorbed by greenhouse gases in the atmosphere and reflected back

The atmosphere warms up