Ultraviolet Lesson 5 discusses photosynthesis and the benefits and risks of sunlight. It explains how plants use carbon dioxide, water, and electromagnetic radiation (light) to produce oxygen and glucose. It also discusses strategies for increasing sun safety and how the ozone layer protects the earth. The document provides discussion questions about photosynthesis, getting sunburnt in space, and the color of plants. It tasks working with a partner to answer one of the questions.