Conservation of wildlife is necessary mainly because

Analyze the question: The question asks for the main reason wildlife conservation is necessary. Look for the option that covers the central purpose of conservation, not a side benefit.

Explain the concept: Conservation is the planned protection and management of natural resources, including wild plants and animals, so that they are not lost or wasted. The most important goal of wildlife conservation is to protect species from extinction and so preserve biodiversity (the variety of living things) for present and future generations.

Step-by-step solution:

• A. Wild species cannot resist disease better than their domesticated species. This is a weak and inaccurate statement. Wild species often have stronger genetic resistance to disease, and that is one reason their gene pool is valuable. It is not a reason for conservation.
• B. Many predator wild animals help in the control of pests. This is true for some animals, but it is only a specific benefit. It does not apply to all wildlife, so it is not the main reason.
• C. It prevents extinction of species. This is the core purpose of conservation. Threats like poaching, deforestation, bush burning and habitat loss can wipe out species permanently. Conservation (game reserves, national parks, anti-poaching laws, and protected areas such as Yankari Game Reserve and Cross River National Park) exists to stop this.
• D. Many people derive pleasure from observing wild animals. Recreation and tourism are secondary benefits, not the main reason.

Answer: C

Exam tip: When a question asks for the "main" or "major" reason for conservation, choose the option about preventing extinction or maintaining biodiversity. Options describing a single benefit, such as pest control or recreation, are usually distractors.