Most students know that the sun is at the base of the food chain.
They've learned that sunlight makes plants grow, that animals eat plants, that predators prey on these animals and so forth. However, few people stop to think about how the food chain changes with the seasons. For example, during spring in the Northern Hemisphere, sunlight and photosynthesis increase, temperatures rise, and food production increases. This lesson will help your students see the central role that sunlight plays in living systems. Review the concept of a food chain.