Biological organisation starts with

Options

A. Atomic level
B. Submicroscopic molecular level
C. Cellular level
D. Organismic level

Answer

### Step-by-Step Solution:

1. **Understanding Biological Organization**: Biological organization refers to the hierarchical structure of living organisms, which starts from the smallest unit and progresses to larger and more complex structures.

2. **Identifying the Starting Point**: The question asks where biological organization begins. The options provided are:
- Atomic level
- Submicroscopic molecular level
- Cellular level
- Organismic level

3. **Analyzing the Options**:
- **Atomic Level**: This refers to the smallest units of matter, which are atoms. While atoms are essential for forming molecules, they are not the starting point of biological organization.
- **Submicroscopic Molecular Level**: This level includes biomolecules such as carbohydrates, proteins, lipids, and nucleic acids. These molecules are crucial for the formation of cells and are considered the building blocks of life.
- **Cellular Level**: This level refers to cells, which are the basic units of life. However, cells are formed from biomolecules, so this level cannot be the starting point.
- **Organismic Level**: This level refers to the entire organism, which is the most complex level of biological organization.

4. **Conclusion**: Since biological organization begins with the formation of biomolecules, which are at the submicroscopic molecular level, the correct answer is the **submicroscopic molecular level**.

### Final Answer:
Biological organization starts with the **submicroscopic molecular level**.

---