Which one of the following is wrong for fungi

Options

A. They are eukaryotic
B. All fungi possess a purely cellulosic cell wall
C. They are heterotrophic
D. They are both unicellular and multicellular

Answer

To determine which statement about fungi is incorrect, we need to analyze the characteristics of fungi based on their classification and structure. Here’s a step-by-step breakdown of the solution:

### Step 1: Understand the Classification of Fungi
Fungi are classified into several groups, including:
- Phycomycetes (algal fungi)
- Ascomycetes
- Basidiomycetes
- Deuteromycetes

### Step 2: Identify the Cell Wall Composition
- Phycomycetes have a cell wall made of cellulose.
- Ascomycetes, Basidiomycetes, and Deuteromycetes have cell walls made of chitin (also referred to as fungal cellulose).

### Step 3: Analyze the Nutrition Mode
Fungi are primarily heterotrophic, meaning they obtain their nutrients from other organic sources. They can be:
- Parasitic (feeding on a host)
- Symbiotic (forming beneficial relationships, e.g., mycorrhizae)
- Saprophytic (decomposing dead organic matter)

### Step 4: Examine the Cellular Structure
Fungi can be unicellular or multicellular. Yeast is an example of a unicellular fungus, while many others are multicellular.

### Step 5: Evaluate the Statements
Now, let's evaluate the statements provided:
1. Fungi are eukaryotic. **(True)**
2. All fungi possess a purely cellulosic cell wall. **(False)** - This is the incorrect statement because only phycomycetes have a cell wall made of cellulose; the others have chitin.
3. Fungi are heterotrophic in nutrition. **(True)**
4. Fungi can be unicellular and multicellular. **(True)**

### Conclusion
The statement that "All fungi possess a purely cellulosic cell wall" is incorrect. Therefore, the answer is option 2.

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