OCR General Certificate of Secondary Education (GCSE) Biology Practice Exam

Which of the following actions is NOT a method to stop overgrazing?

1. Moving herds periodically

2. Cutting down trees in fragile areas

3. Dug small pits into fields during dry season

4. Preserving natural vegetation

The correct answer is: Cutting down trees in fragile areas

The correct choice highlights that cutting down trees in fragile areas is not a method to stop overgrazing, but rather can contribute to the problem. Overgrazing occurs when too many animals graze on a piece of land, leading to degraded vegetation and soil. To manage grazing effectively, practices that encourage the regrowth of grass and protect the land are essential. Moving herds periodically is a method known as rotational grazing, which allows pastures to recover by preventing continuous grazing in one area, thereby promoting healthy grass growth. Dug small pits into fields during the dry season can help trap and retain moisture, encouraging better growth of vegetation which can mitigate the effects of overgrazing. Preserving natural vegetation enhances biodiversity and provides a sustainable habitat for wildlife, preventing degradation associated with overgrazing. In contrast, cutting down trees, especially in fragile ecosystems, can exacerbate soil erosion, reduce shade and moisture retention, and ultimately lead to increased vulnerability to overgrazing. Therefore, recognizing the importance of maintaining trees and natural vegetation is vital in strategies aimed at preventing overgrazing.