Which of the following shows extrinsic growth?

Options

A. Snow mountain
B. Bacteria
C. Euglena
D. Spirogyra

Explanation

To determine which of the following options shows extrinsic growth, we need to understand the concept of extrinsic growth and how it differs from intrinsic growth.

### Step-by-Step Solution:

1. **Define Extrinsic Growth**:
- Extrinsic growth refers to growth that occurs externally, meaning it involves the accumulation of material from outside the organism or object. This type of growth is typically reversible and is characteristic of non-living objects.

2. **Identify the Options**:
- The options given are:
- A) Snow Mountain
- B) Bacteria
- C) Euglena
- D) Spirogyra

3. **Analyze Each Option**:
- **A) Snow Mountain**:
- This is a non-living object. Snow can accumulate and form a snow mountain due to external factors (like snow falling). This demonstrates extrinsic growth.
- **B) Bacteria**:
- Bacteria are living organisms that grow through intrinsic growth, which involves cell division and internal processes. Therefore, this option does not show extrinsic growth.
- **C) Euglena**:
- Euglena is a living organism (a type of protist) that also grows intrinsically. Thus, this option does not show extrinsic growth.
- **D) Spirogyra**:
- Spirogyra is a filamentous green algae, which is also a living organism. It grows through intrinsic processes, so this option does not show extrinsic growth.

4. **Conclusion**:
- The only option that shows extrinsic growth is **A) Snow Mountain**. This is because it is a non-living object that grows through the accumulation of external materials.

### Final Answer:
**A) Snow Mountain**