At the end of photosynthesis, the green leaf is tested for starch and not glucose, because

Nigerias population is unevenly distributed. Dense concentrations exist in: Lagos (commercial hub), Kano (northern trade center), the southeast (Igbo heartland), and river valleys with fertile soil.

Factors affecting distribution: rainfall and water availability, fertile land, historical trade routes, employment opportunities, and infrastructure. Urban areas grow rapidly due to rural-urban migration.

Sparse populations occur in: the middle belt (tsetse fly zone historically), mountainous areas, and the arid far north. Nigeria is Africas most populous country with over 200 million people.