While glucose is technically a sugar and therefore soluble in water, it is often stored in plants as a solid polymer called starch. Starch is made up of many glucose molecules linked together, forming a large and complex molecule that is insoluble in water.

Here's a breakdown:

* Photosynthesis: Plants use sunlight, water, and carbon dioxide to create glucose (C6H12O6) and oxygen (O2).

* Glucose: A simple sugar, used by plants for energy and growth.

* Starch: A complex carbohydrate made up of many glucose molecules linked together. Plants store starch as a solid for later use as energy.