In which form excess of glucose stored in plants and animals and where it is stored?

In plants, excess of glucose is stored in the form of starch. It is stored in roots, leaves, tubers, bulbs, etc.

In animals, the excess of glucose is stored in the form of glycogen. It is stored in various organs of the body mainly in liver and muscles.

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 Plants store their excess glucose as starch which is hundreds of glucose molecules joined together in a chain ie starch is a polymer of glucose. In fact starch consists of amylose and amylopectin

animals

Glucose can be stored as glycogen (energy reserve) through the process called glycogenesis by the enzyme glycogen synthase. The conversion of glucose to glycogen enables the body to 'park' or store extra carbohydrate calories, for future use. 
Glycogen are stored in:
*Liver (comprising about 10 percent of the liver). Liver-glycogen is more readily available for energy and blood glucose maintenance
*Muscles containing a relatively small amount. Muscle-glycogen is used primarily for muscle-energy. 
*Brain where small amounts of glycogen are found in the glial cells.

Liver and muscles are the primary storage area of glycogen.

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The excess glucose is stored as starch in plants. In heterotrophic the excess glucose is stores as glycogen.

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