In monocotyledonous plants e.g., wheat, the primary root is short lived and is replaced by a large number of roots, these roots orginate from the base of the stem and consitute the-

Options

A. Prop roots
B. Pneumatophores
C. Napiform
D. Fibrous roots

Answer

To solve the question regarding the type of root system in monocotyledonous plants like wheat, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Plant Type**: Recognize that the question is about monocotyledonous plants, which includes species like wheat. Monocots typically have a different root structure compared to dicots.

**Hint**: Remember that monocots and dicots have distinct characteristics, especially in their root systems.

2. **Identify the Primary Root**: In monocots, the primary root is usually short-lived. This means that it does not persist for long and is replaced by other types of roots.

**Hint**: Think about what happens to the primary root in monocots compared to dicots.

3. **Roots Originating from the Stem**: The question specifies that the roots originate from the base of the stem. This is a key characteristic of the root system in monocots.

**Hint**: Consider how roots can develop from different parts of the plant, especially in monocots.

4. **Differentiate Root Types**: The roots that arise from the base of the stem in monocots are not the same as the taproot system found in dicots. Instead, they form a network of roots.

**Hint**: Recall the terminology used for different root systems, especially the fibrous root system.

5. **Identify the Correct Answer**: Given that the roots in question are numerous and arise from the base of the stem, they constitute a fibrous root system.

**Final Answer**: The correct answer is D. Fibrous root.

### Summary of the Solution:
In monocotyledonous plants like wheat, the primary root is short-lived and is replaced by a large number of roots that originate from the base of the stem, constituting a fibrous root system.