_ is stored in animal ceIIs:

Explanation

Starch: Starch is not stored in animal cells. It is a complex polysaccharide and the primary energy storage carbohydrate in plants. Plants produce and store starch in various parts like tubers, seeds, and fruits. Animals cannot directly store or utilize starch as an energy reserve. Cellulose: Cellulose is also not stored in animal cells. It is another complex polysaccharide and the major structural component of the cell walls in plants. Cellulose provides rigidity and strength to plant cells but is not used as an energy storage molecule in animals. Sucrose: Sucrose is a disaccharide composed of one glucose molecule and one fructose molecule linked together. While sucrose is found in certain plants, it is not the primary energy storage carbohydrate in animal cells. Glycogen: The correct option is glycogen. Glycogen is a highly branched polysaccharide composed of glucose units and serves as the primary energy storage molecule in animals, including humans. It is the animal equivalent of starch in plants. Glycogen is stored in the liver and muscles, where it acts as a readily available source of glucose during periods of increased energy demand. When energy is needed, glycogen is broken down into glucose units, which are further utilized through cellular respiration to produce energy.In summary, option d) Glycogen is the correct option. Glycogen is stored in animal cells and acts as a readily accessible source of glucose for energy production. The other options (a) Starch, (b) Cellulose, and (c) Sucrose are not stored in animal cells; they have different functions in plants and are not used as energy reserves in animals.