In unit area which stored polysachharide porvides maximum energy?

Options

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

Answer

To determine which stored polysaccharide provides the maximum energy in a unit area, we need to analyze the options given: starch, lipids, glycogen, and cellulose.

### Step-by-Step Solution:

1. **Understanding Polysaccharides**:
- Polysaccharides are long chains of monosaccharides (sugar units) linked together. They serve various functions, including energy storage.

2. **Analyzing the Options**:
- **Starch**: This is the primary energy storage polysaccharide in plants. It is made up of amylose and amylopectin, which are both polymers of glucose.
- **Glycogen**: This is the primary energy storage polysaccharide in animals and fungi. It is highly branched and consists of glucose units.
- **Cellulose**: This is a structural polysaccharide found in the cell walls of plants. It is not used for energy storage.
- **Lipids**: Although not a polysaccharide, lipids are another form of energy storage, but they are not classified under polysaccharides.

3. **Energy Storage Capacity**:
- Glycogen is a multi-branched structure, allowing for rapid mobilization of glucose when energy is needed. Each branch provides multiple ends for enzymatic action, leading to quicker energy release.
- Starch, while also a storage polysaccharide, is less branched than glycogen, which means it releases energy more slowly.
- Cellulose is not an energy source and is used for structural purposes.
- Lipids, while they provide more energy per gram than carbohydrates, are not polysaccharides.

4. **Conclusion**:
- Among the options, glycogen provides the maximum energy in a unit area because of its branched structure, which allows for efficient energy release.

### Final Answer:
The stored polysaccharide that provides maximum energy in unit area is **glycogen**.

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