The statement "Both of them give colour with iodine" is not correct.

Starch and cellulose are both polysaccharides and are indeed of plant origin. They are complex carbohydrates and are composed of repeating units of glucose molecules, making them polymers. However, they differ in their structural arrangement and functions.

Starch is the primary energy storage molecule in plants. It consists of two main components: amylose and amylopectin. Starch molecules have a helical structure and can be broken down by enzymes to release glucose for energy.

Cellulose, on the other hand, is a major component of the cell walls in plants. It provides structural support and rigidity to plant cells. Cellulose molecules form long, straight chains that are interconnected through hydrogen bonds, forming a strong and stable structure.

While both starch and cellulose are composed of glucose molecules, their arrangement and linkages differ. This structural difference influences their properties and functions in plants.

Regarding the statement in question, while iodine does react with starch to produce a characteristic blue-black color, it does not react with cellulose in the same way. Cellulose does not give a color with iodine. Therefore, the statement "Both of them give colour with iodine" is not correct.