Which of the following factors will NOT affect supply of maize in Nigeria?

1. Analyze the question The question asks which factor will NOT affect the supply of maize. So we need the option that is not a determinant of maize supply.

2. Explain the concept Supply of a good depends on:

• Price of the good itself (the law of supply: higher price, greater quantity supplied)
• Technology (better technology lowers costs and raises output)
• Government policy and services (subsidies, taxes, extension services)
• Weather and climate (especially important for agricultural products)
• Prices of related goods (substitutes in production)
• Cost of production, number of producers

3. Step-by-step evaluation

• A. Extension services to farmers: These give farmers advice on better methods, seeds, and fertilizer, which raises output. It affects supply.
• B. Improved technology: Lowers costs and raises productivity. It affects supply.
• C. Price of maize: This changes the quantity supplied. It affects supply.
• D. Quantity of wheat produced: This is the quantity of another crop, not its price. Wheat is hardly grown in Nigeria, so it is not a meaningful competing crop for maize farmland. The amount of wheat produced is a result, not a driver of maize supply decisions. It is the least relevant factor.
• E. Weather and climatic condition: Rainfall and drought strongly affect harvests. It affects supply.

4. Answer The factor that will NOT affect the supply of maize is D. Quantity of wheat produced.

(A caution: if the option had said the price of a competing crop like yams or millet, it could affect supply through competitive supply. But the quantity of wheat, which is not grown widely in Nigeria, has no real effect.)

5. Exam tip For "which will NOT affect supply" questions, cross out all the standard determinants first: price, technology, cost of production, weather, government policy, and the number of sellers. The one left over is the answer. Also remember that related goods affect supply through their prices, not simply the quantity produced.