The underground modification of stem occurs for which one of the following function ?

Options

A. respiration
B. perennation
C. vegetative reproduction
D. anchorage

Answer

To solve the question regarding the function of underground modifications of stems, we can follow these steps:

### Step 1: Understand the Concept of Underground Modifications of Stems
Underground modifications of stems are specialized structures that grow beneath the soil surface. Common examples include rhizomes, bulbs, corms, and tubers. These structures serve various functions essential for the plant's survival and growth.

**Hint:** Think about what adaptations plants have developed to thrive underground.

### Step 2: Identify the Functions of Underground Stems
The primary functions of underground stems include:
1. **Storage**: They store food and nutrients, which can be used by the plant during periods of growth or dormancy.
2. **Reproduction**: They can aid in vegetative reproduction, allowing the plant to propagate and spread.
3. **Perennation**: This refers to the ability of the plant to survive unfavorable conditions (like winter or drought) by remaining dormant underground.

**Hint:** Consider how these functions help plants survive in different environments.

### Step 3: Analyze the Given Options
Now, let's evaluate the options provided in the question:
1. **Respiration**: This is not a primary function of underground stems.
2. **Perennation**: This is a correct function associated with underground stems, as they help plants survive adverse conditions.
3. **Reproduction**: While underground stems can aid in reproduction, it is not their primary function.
4. **Storage**: While they do store nutrients, the question specifically asks for a function that is more aligned with their role in survival.

**Hint:** Focus on the most significant role that aligns with the survival of the plant through adverse conditions.

### Step 4: Conclusion
Based on the analysis, the correct answer to the question is that the underground modification of stem occurs primarily for the function of **perennation**.

**Final Answer:** Perennation