A lichen able to fix nitrogen also is called

Options

A. azotodesmic lichen
B. corticolus lichen
C. lignocolus lichen
D. saxicolous lichen

Answer

To solve the question "A lichen able to fix nitrogen also is called," we will follow these steps:

### Step 1: Understand the Nature of Lichens
Lichens are a symbiotic association between a fungus and an algae (or cyanobacteria). The algae perform photosynthesis, providing food for the lichen.

**Hint:** Remember that lichens consist of two main partners: a fungus and a photosynthetic organism.

### Step 2: Identify the Function of Nitrogen-Fixing Lichens
Some lichens have the ability to fix atmospheric nitrogen, converting it into nitrates, which can be utilized by plants. This process is crucial for enriching soil fertility.

**Hint:** Think about the role of nitrogen in ecosystems and how certain organisms can convert it into a usable form for plants.

### Step 3: Analyze the Options Provided
The options given are:
- A) Azotodesmic lichen
- B) Corticulous lichen
- C) Lignoculous lichen
- D) Sexiculous lichen

Among these, we need to identify which term specifically refers to lichens that can fix nitrogen.

**Hint:** Look for the prefix "azo-" in the options, which is commonly associated with nitrogen.

### Step 4: Identify the Correct Answer
The correct answer is **A) Azotodesmic lichen**. This term specifically refers to lichens that are capable of fixing atmospheric nitrogen.

**Hint:** Recall that "azoto" relates to nitrogen, helping you connect the term to its function.

### Final Answer
Thus, a lichen able to fix nitrogen is called **Azotodesmic lichen** (Option A).