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, starting from the smallest units to the most complex forms.

2. **Identifying Levels of Organization**: The levels of biological organization include:
- Atomic level
- Submicroscopic molecular level
- Cellular level
- Tissue level
- Organ level
- Organ system level
- Organism level

3. **Starting Point of Biological Organization**: To determine where biological organization starts, we need to analyze the smallest unit involved in biological processes.

4. **Atomic Level vs. Molecular Level**: While the atomic level is fundamental, it is not the first level of biological organization. The atomic level consists of atoms, which combine to form molecules.

5. **Submicroscopic Molecular Level**: The submicroscopic molecular level includes macromolecules such as carbohydrates, lipids, proteins, and nucleic acids. These molecules are essential for cellular functions and are present within cells.

6. **Cellular Level**: After the molecular level, the next level is the cellular level, where these molecules come together to form cells, which are the basic units of life.

7. **Conclusion**: Therefore, the biological organization starts with the **submicroscopic molecular level**, which is the first level of organization before moving on to the cellular level.

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

---