1. What is Photosynthesis ? Explain the process of photosynthesis . Photosynthesis is a biological process utilized by all green plants to synthesize their own nutrients. The process of photosynthesis requires solar energy, water and carbon dioxide. The by-product of this process is oxygen. EXPLAIN definition: 1. to make something clear or easy to understand by giving reasons for it or details about it: 2. things you say to explain or give a good reason… Describe and explain are two words that often get mixed up, but they serve different purposes. To describe something means to provide details about what it looks, feels, sounds like, or behaves. It’s like painting a picture with words so someone can imagine it clearly. On the other hand, when you explain something, you’re giving reasons why it happens or giving instructions on how to do something. Explanation involves making things clearer or easier to understand by providing more ... Any decent teacher should be able to explain the difference between transitive and intransitive verbs. Pay attention to what she's saying because she won't explain it a second time.