Directions: Below in each question, some sentences are given, find the sentence which is not really contributing to the main theme and OUT of the passage or find the odd sentence and rearrange the remaining sentences to make a coherent paragraph.

1. Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy that can later be released to fuel the organisms' activities.
2. This chemical energy is stored in carbohydrate molecules, such as sugars, which are synthesized from carbon dioxide and water – hence the name photosynthesis.
3. In most cases, oxygen is also released as a waste product.
4. Such organisms are called photoautotrophs. 
5. Most plants, most algae, and cyanobacteria perform photosynthesis.