Which statements about deforestation are correct?
- Deforestation causes an increase in atmospheric carbon dioxide.
- Deforestation causes an increase in biodiversity.
- Deforestation causes an increase in the loss of soil.
A) 1 and 2 only
B) 1 and 3 only
C) 2 and 3 only
D) 3 only
▶️ Answer/Explanation
Ans: B
Statement 1 is correct because trees absorb CO₂ during photosynthesis. Their removal increases atmospheric CO₂ levels.
Statement 2 is incorrect as deforestation reduces biodiversity by destroying habitats.
Statement 3 is correct because tree roots stabilize soil; their loss leads to erosion.
Since only 1 and 3 are correct, the answer is B.
Which change occurs when areas of forest are cleared for farming?
A) decreased release of carbon dioxide into the atmosphere
B) increased biodiversity
C) increased loss of soil
D) increased release of oxygen into the atmosphere
▶️ Answer/Explanation
Ans: C
When forests are cleared for farming, tree roots that previously held soil in place are removed, leading to increased soil erosion (C). This exposes topsoil to wind and water, causing significant loss.
Other options are incorrect: deforestation increases CO₂ release (A), reduces biodiversity (B), and decreases oxygen production (D) as fewer trees remain for photosynthesis. Thus, C is the only accurate consequence.