the most aboundant organic compound in biophere is

Options

A. (a) Lignin
B. (b) Celluose
C. (c) Pectin
D. (d) Hemi-cellulose

Answer

**Step-by-Step Solution:**

1. **Understanding the Question:**
The question asks for the most abundant organic compound in the biosphere. The biosphere refers to all living organisms and their environments on Earth.

2. **Identifying the Options:**
The options provided are different polysaccharides made up of glucose units. Common examples include cellulose, starch, and glycogen.

3. **Analyzing the Compounds:**
- **Cellulose:** A polysaccharide that is a major component of plant cell walls. Its chemical formula is C6H10O5, and it is composed of unbranched chains of glucose molecules.
- **Starch:** A storage polysaccharide in plants, made up of glucose units, but it is not as abundant as cellulose in the biosphere.
- **Glycogen:** A storage form of glucose in animals, also less abundant compared to cellulose.

4. **Determining the Most Abundant Compound:**
Cellulose is the primary constituent of the cell walls of all plants, making it universally present in the plant kingdom. Other polysaccharides like starch and glycogen are present in specific organisms or serve as storage forms, thus they are not as widely distributed as cellulose.

5. **Conclusion:**
Since cellulose is a fundamental component of plant cell walls and is found in all plants, it is the most abundant organic compound in the biosphere.

**Final Answer:**
The most abundant organic compound in the biosphere is **cellulose**.

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