Select the incorrect statements form the following

Options

A. Velamen roots of Vanda are not assimilatory
B. All haustorial roots are adventitious
C. All tuberous roots are underground
D. Nodulated roots are formed only by Rhizobium

Answer

To solve the question of selecting the incorrect statements regarding root systems and their functions, we will analyze each statement carefully. Here’s a step-by-step breakdown:

### Step 1: Understand the Root System
The root system of a plant is primarily responsible for anchoring the plant in the soil and absorbing water and minerals. However, roots can also undergo modifications to perform additional functions.

**Hint:** Remember the primary functions of roots: anchorage and absorption.

### Step 2: Analyze Each Statement
We will evaluate each statement provided in the question to determine its correctness.

1. **Statement 1:** "The Willamine roots of Wanda are not assimilatory."
- **Analysis:** Wanda is a parasitic plant that relies on other plants for water and nutrients. Its roots are specialized and do not perform photosynthesis, which makes this statement correct.

**Hint:** Consider whether the roots of a parasitic plant can perform photosynthesis.

2. **Statement 2:** "All haustorial roots are advantageous."
- **Analysis:** Haustorial roots are found in parasitic plants and help in absorbing water and nutrients from a host. This statement is also correct.

**Hint:** Think about the role of haustorial roots in parasitic plants.

3. **Statement 3:** "All tuberous roots are underground."
- **Analysis:** Tuberous roots are modified for storage and are typically found underground. This statement is correct as well.

**Hint:** Recall the characteristics of tuberous roots and where they are usually located.

4. **Statement 4:** "Only Rhizobium can form nodulated roots."
- **Analysis:** While Rhizobium is known for forming nodules on leguminous plants for nitrogen fixation, it is not the only organism capable of this. Other prokaryotic organisms can also form nodulated roots. Therefore, this statement is incorrect.

**Hint:** Consider other organisms that might also form nodules for nitrogen fixation.

### Step 3: Identify the Incorrect Statement
From our analysis, the incorrect statement is:
- **"Only Rhizobium can form nodulated roots."** This is incorrect because multiple prokaryotic organisms can also form nodulated roots.

### Conclusion
The incorrect statement is option D.

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