State whether the following statements are true of false: Statement 1: Plants help to purify air by taking in carbon dioxide. Statement 2: Carbon dioxide is used in photosynthesis during daytime.
Select True or False in the following statements regarding photosynthesis and respiration.
1. Photosynthesis occurs only in the presence of chlorophyll. 2. Photosynthesis occurs at all time. 3. Respiration uses carbon dioxide and water. 4. In respiration carbon dioxide is released as end product.