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Human influences on the environment

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Question 29

Plants and animals carry out respiration to release energy.

a.

Give the balanced chemical symbol equation for aerobic respiration.

[1]
b.

The table below shows estimated global carbon dioxide (CO2\text{CO}_2CO2​) emissions from fossil fuel combustion between 2000 and 2020.

YearMass of CO2\text{CO}_2CO2​ released (millions of tonnes)
200025000
200528000
201031000
201534000
202036000

Calculate the percentage increase in the mass of CO2\text{CO}_2CO2​ released globally between 2000 and 2020.

[2]
c.

Give three negative environmental effects of increased levels of carbon dioxide in the atmosphere.

[3]
d.

Explain how reducing deforestation can help limit the increase of atmospheric carbon dioxide.

[2]

Human influences on the environment Questions

  1. IGCSE
  2. /Biology
  3. /Human influences on the environment