Which of the following function is not performed by undergournd stem?

Options

A. Reproduction
B. Assimilation
C. Perennation
D. Storage

Answer

To determine which function is not performed by underground stems, we need to analyze the functions typically associated with them. Here’s a step-by-step breakdown:

### Step 1: Understand what underground stems are
- **Definition**: Underground stems are modified structures of plants that grow below the soil surface. Common examples include rhizomes, tubers, and bulbs.

### Step 2: Identify the functions of underground stems
- **Reproduction**: Underground stems can reproduce asexually. For example, bulbs (like onions) and rhizomes (like ginger) can give rise to new plants.
- **Storage**: Underground stems often store nutrients and energy in the form of starch. For instance, tubers like potatoes store food.
- **Perennation**: This refers to the ability of a plant to survive from one growing season to the next, which underground stems facilitate by storing energy and allowing regrowth.
- **Assimilation**: This process involves the conversion of nutrients into usable forms for the plant, primarily occurring in the leaves and not typically associated with underground stems.

### Step 3: Analyze the options given
1. **Reproduction** - Performed by underground stems.
2. **Assimilation** - Not performed by underground stems.
3. **Perennation** - Performed by underground stems.
4. **Storage** - Performed by underground stems.

### Step 4: Conclusion
Based on the analysis, the function that is **not performed by underground stems** is **assimilation**. Therefore, the correct answer is:

**Answer: Assimilation**

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