Read the passage given below and answer the question:
Polysaccharides may be very large molecules. Starch, glycogen, cellulose, and chitin are examples of polysaccharides.
Starch is the stored form of sugars in plants and is made up of amylose and amylopectin (both polymers of glucose). Amylose is soluble in water and can be hydrolyzed into glucose units breaking glycocidic bonds, by the enzymes a- amylase and B-amylase. It is straight chain polymer. Amylopectin is a branched chain polymer of several D-glucose molecules. 80% of amylopectin is present in starch. Plants are able to synthesize glucose, and the excess glucose is stored as starch in different plant parts, including roots and seeds. The starch that is consumed by animals is broken down into smaller molecules, such as glucose. The cells can then absorb the glucose.
Glycogen is the storage form of glucose in humans and other vertebrates, and is made up of monomers of glucose. It is structurally quite similar to amylopectin. Glycogen is the animal equivalent of starch. It is stored in liver and skeletal muscles.
Cellulose is one of the most abundant natural biopolymers. The cell walls of plants are mostly made of cellulose, which provides structural support to the cell. Wood and paper are mostly cellulosic in nature.
Like amylose, cellulose is a linear polymer of glucose. Cellulose is made up of glucose monomers that are linked by bonds between particular carbon atoms in the glucose molecule.Every other glucose monomer in cellulose is flipped over and packed tightly as extended long chains. This gives cellulose its rigidity and high tensile strength-which is so important to plant cells. Cellulose passing through our digestive system is called dietary fiber.
(Source: `"https://chem.libretexts.org"`)
Which biopolymer breaks down to release glucose , whenever glucose levels drop in Our body:

Options

A. starch
B. cellulose
C. chitin
D. glycogen

Answer

To answer the question, "Which biopolymer breaks down to release glucose whenever glucose levels drop in our body?" we can follow these steps:

### Step 1: Identify the biopolymers mentioned
The passage mentions four biopolymers:
1. Starch
2. Glycogen
3. Cellulose
4. Chitin

### Step 2: Understand the function of each biopolymer
- **Starch**: This is the storage form of glucose in plants. It is not directly involved in glucose release in animals.
- **Glycogen**: This is the storage form of glucose in humans and other vertebrates. It is stored in the liver and muscles and can be broken down to release glucose when needed.
- **Cellulose**: This is a structural component of plant cell walls and is not digested by humans, hence it does not release glucose.
- **Chitin**: This is found in the exoskeletons of arthropods and is not a source of glucose for humans.

### Step 3: Determine the correct answer
From the analysis, glycogen is the only biopolymer that is stored in the body and can be broken down to release glucose when glucose levels drop. Therefore, the correct answer is:

**Glycogen (Option D)**

### Step 4: Conclusion
Whenever glucose levels in the body decrease, glycogen is converted back into glucose to maintain energy levels.

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