WAEC Past Questions and Answers - Page 3257

The problem of What to Produce involves selection of goods and services to be produced and the quantity to be produced of each selected commodity. Every economy has limited resources and thus, cannot produce all the goods.

The food substance that would produce the highest amount of energy is fat.
Fat is the most energy-dense macronutrient, providing 9 calories per gram. On the other hand, both carbohydrates (including glucose) and proteins provide 4 calories per gram. While amino acids are the building blocks of proteins, they are not a direct source of energy like fat and carbohydrates.

Deforestation: Deforestation is the opposite of afforestation. It involves the clearing or removal of forests or trees from an area. Deforestation leads to the loss of valuable natural resources like timber, biodiversity, soil fertility, and water regulation. It disrupts ecosystems, accelerates soil erosion, and releases stored carbon dioxide, contributing to climate change. Deforestation is detrimental to the conservation of natural resources and has serious environmental consequences.

Post-harvest losses are losses that occur during  transportation, storage, and processing of farm produce. They include on-farm losses, such as when grain is threshed, winnowed, and dried, as well as losses along the chain during. It can be controlled and reduced when good storage facilities are put in place to store harvested produce. 

Organisms that feed on dead, decaying tissues of other organisms are known as "saprophytes." Saprophytes, also known as saprotrophs or decomposers, are organisms that obtain their nutrition by feeding on dead, decaying organic matter (detritus) from other organisms.