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CIE iGCSE Co-Ordinated Science B19.1 Habitat destruction Exam Style Questions Paper 1

CIE iGCSE Co-Ordinated Science Paper 1 - All Chapters

Question

What are undesirable effects of deforestation?

A. habitat creation and decreased carbon dioxide in the atmosphere
B. habitat creation and increased carbon dioxide in the atmosphere
C. habitat destruction and decreased carbon dioxide in the atmosphere
D. habitat destruction and increased carbon dioxide in the atmosphere

▶️ Answer/Explanation
Deforestation involves the removal of trees, which destroys habitats for many species. Trees also absorb carbon dioxide during photosynthesis, so removing them reduces carbon dioxide uptake, leading to increased atmospheric CO₂ levels. This contributes to climate change.
✅ Answer: (D)

Question

Forests are cut down and burnt in deforestation programmes.

As a result of this, which gas in the atmosphere increases in concentration?

A. carbon dioxide
B. hydrogen
C. nitrogen
D. oxygen

▶️ Answer/Explanation
Burning trees during deforestation releases the carbon stored in the wood as carbon dioxide gas through combustion.
Fewer trees also means less carbon dioxide is removed from the air by photosynthesis, adding to the increase.
Together, these effects raise the concentration of carbon dioxide in the atmosphere.
✅ Answer: (A)

Question

Which row describes the effects of deforestation?

▶️ Answer/Explanation
Deforestation removes trees that would otherwise absorb carbon dioxide, so atmospheric carbon dioxide levels increase.
Removing tree cover also removes roots that bind soil and intercept rainfall, so the risk of flooding increases.
Row D correctly shows both an increase in carbon dioxide and an increase in flooding risk.
✅ Answer: (D)

Question

Which row about the effects of deforestation is correct?

▶️ Answer/Explanation
Removing trees reduces interception of rainfall and water uptake by roots, increasing surface run-off and the risk of flooding.
Fewer trees means less carbon dioxide is removed from the atmosphere by photosynthesis, so the amount of atmospheric carbon dioxide increases.
✅ Answer: (D)

Question

What is an undesirable effect of deforestation?

A. It increases the oxygen concentration of the atmosphere.
B. It leads to erosion and loss of soil.
C. It makes land available for agriculture.
D. It pollutes the air with methane.

▶️ Answer/Explanation
Tree roots normally bind and stabilise soil, and their canopy reduces the impact of rain.
Removing trees exposes soil to wind and rain, leading to erosion and loss of fertile topsoil.
✅ Answer: (B)
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