Which biomolecule serves as the main form of stored energy in the bodies of animals?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. Glycogen.
In animals, glycogen serves as the primary stored energy biomolecule. It is a highly branched polysaccharide made of glucose units and is mainly stored in the liver and muscles. When the body needs quick energy, hormones like glucagon and adrenaline break glycogen down into glucose. This rapid mobilization makes glycogen ideal for short-term energy needs. In fact, the human liver can store nearly 100–120 grams of glycogen, helping maintain blood sugar levels during fasting.
Why other options are incorrect:
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Cellulose: Structural carbohydrate in plants; animals cannot digest it.
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Starch: Main storage carbohydrate in plants, not animals.
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Chitin: Forms exoskeletons of insects and crustaceans; not an energy reserve.
Thus, glycogen is the main energy storage molecule in animals.