What is the difference between starch and glycogen ?

Starch and glycogen are made from alpha-glucose. This is an isomer of glucose in which the hydroxyl (-OH) group attached to carbon number1 is below the plane of the ring.

When animals covert glucose into glycogen, the glycogen is primarily stored in the liver and muscle.

Starch-which are been present & found in Plants  

Glycogen-which are been present & found in animals

Glycogen Also known as animal starch is a source of energy that can be found in animals only.Glycogen consist of a single molecule and it's structure is branched purely. The animal liver and muscles are responsible in the creation of glycogen. The glycogen act as an emergency reserves when a human body suddenly need a an ample amount of energy STARCH Starch on the other hand can solely be found in green plants and staple food such as oats, barley and potatoes. Glycogen has a single molecule while starch has double molecules. In term of structure glycogen are branched out purely while starch consist of branch and chain component

There are two forms of starch, amylose and amylopectin. Amylose is a straight chain polymer of glucose with all of the units linked by alpha (1-->4) glycosidic bonds. Amylopectin has a similar structure except that it has alpha (1-->6) branch points every24 to30 glucose residues. Glycogen is very similar to amylopectin except that glycogen has more extensive branching. It has alpha (1-->6) branch points every8 to14 glucose residues. Edit: Correct, starch is found in plants and glycogen in animals. BUT, glycogen is found in all animal cells, not just muscle cells. Glycogen is present in the highest amounts in both muscle and liver cells, where it appears as large granules.

1) Starch is found in plants while glycogen is found in animals.

 

2) Starch consists of20% amylose (unbranched),80% amylopectin (branched), while glycogen is completely branched.

 

3) Glycogen is much more extensively branched than starch, with a branch point every8-12 residues, while in starch it's about every30 residues.