The main difference between a carbohydrate and a lipid is that carbohydrates are water soluble and lipids are not water soluble.
Lipids have more energy storage capacity than carbohydrates, which is why the body stores energy it doesn't use as fat (lipids)
fats (in plants carbohydrates are stored as cellulose and lipids as oils) Lipids have less effect on osmotic pressure within a cell than complex carbohydrates.
Cellulose is a carbohydrate, as is starch. It is a type of structural polysaccharide, whereas starch is a type of storage polysaccharide.