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

What method can be used to prevent overgrazing?

1. Planting more trees in the area

2. Digging small pits during the rainy season

3. Moving herds from place to place

4. Reducing livestock numbers

The correct answer is: Moving herds from place to place

The most effective method to prevent overgrazing is moving herds from place to place, a practice known as rotational grazing. This approach allows vegetation in grazed areas to recover and regenerate while the livestock are moved to different areas with ample forage. By regularly rotating grazing areas, plants have the chance to regrow, which maintains or even improves pasture health and prevents soil degradation. This method not only safeguards the existing vegetation but also encourages biodiversity. While planting more trees can enhance the overall ecosystem and digging small pits may aid in water conservation or soil health, these methods do not directly and effectively address the issue of overgrazing. Reducing livestock numbers could help alleviate pressure on pastureland, but it might not be a feasible long-term solution for farmers looking to maintain a productive herd. Thus, the practice of moving herds is a proactive strategy that ensures sustainable land use and prevents overgrazing more efficiently.