Wild beasts of Africa migrate in response to

Options

A. Excessive heat
B. Cold freezing temperature
C. Rainfall
D. Overpopulaion.

Answer

**Step-by-Step Text Solution:**

1. **Understanding the Question**: The question asks about the primary factor that triggers the migration of wild beasts in Africa.

2. **Identifying the Options**: The options provided are:
- Excessive heat
- Cold
- Freezing temperature
- Rainfall
- Overpopulation

3. **Analyzing the Migration of Wild Beasts**: Wild beasts, particularly wildebeests, migrate in large numbers across Africa. This migration is a seasonal event that involves approximately 1.5 million animals.

4. **Key Factors Influencing Migration**: The migration is primarily influenced by:
- **Seasonal rains**: The availability of rainfall directly affects the growth of grass, which is the primary food source for these animals.
- **Availability of grazing**: As the rains come, grass becomes abundant, prompting the animals to move to areas where food is plentiful.

5. **Geographical Context**: The migration occurs in regions such as Tanzania's Serengeti and Kenya's Masai Mara, where the ecosystem supports this movement.

6. **Physical Barriers**: There are physical barriers like hills and rivers that can alter the migration path, but they do not initiate the migration itself.

7. **Eliminating Incorrect Options**:
- Excessive heat and cold/freezing temperatures are not the primary reasons for migration.
- Overpopulation does not directly cause the migration; rather, it is the search for food and water that drives the movement.

8. **Conclusion**: The correct answer is that wild beasts of Africa migrate in response to **rainfall**, which leads to the availability of grazing.

**Final Answer**: Rainfall.

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