The polysaccharide (polysaccharide - see under saccharides
) with the Latin name Amylum is formed in the form of white to yellowish grains in green plants during photosynthesis
from carbon dioxide and water and serves as a storage material in roots, tubers, marrow and seeds. The starch grains are built up during the day by the sunlight. At night they are processed to obtain the sugar required for respiration
. The grapes contain relatively little starch, which is why they do not ripen after the harvest. Starch is particularly abundant in cereal grains, potatoes and bananas. It is one of the most important human foods (bread and flour) and can also be fermented to alcohol.