`{:(,,"Column I","Column II"),(,I,"Saccharomyces","A. Bacteria"),(,II,"Trichoderma","B. Cyanobacteria"),(,III,"Lactobacillus","C . Fungi"),(,IV, "Nostoc","D. Yeast"):}`
Which of the combinations is correct?

Options

A. I-D, II-C, III-A, IV-B
B. I-C, II-D, III-A, IV-B
C. I-A, II-B, III-C, IV-D
D. I-D, II-B, III-A, IV-C

Answer

To determine the correct combinations of organisms in Column I with their respective classifications in Column II, we will analyze each organism one by one.

### Step-by-Step Solution:

1. **Identify Saccharomyces**:
- Saccharomyces is commonly known as yeast, specifically baker's yeast. It is primarily used in baking and brewing processes.
- **Correct Match**: Saccharomyces - D. Yeast

2. **Identify Trichoderma**:
- Trichoderma is a genus of fungi known for its role in soil treatment and increasing soil fertility. It is not a bacterium.
- **Correct Match**: Trichoderma - C. Fungi

3. **Identify Lactobacillus**:
- Lactobacillus is a type of bacteria that is crucial in the fermentation process, particularly in converting milk into yogurt or curd.
- **Correct Match**: Lactobacillus - A. Bacteria

4. **Identify Nostoc**:
- Nostoc is a genus of cyanobacteria (often referred to as blue-green algae) that is involved in nitrogen fixation and can form symbiotic relationships with plants.
- **Correct Match**: Nostoc - B. Cyanobacteria

### Summary of Matches:
- I. Saccharomyces - D. Yeast
- II. Trichoderma - C. Fungi
- III. Lactobacillus - A. Bacteria
- IV. Nostoc - B. Cyanobacteria

### Final Answer:
The correct combinations are:
- I - D
- II - C
- III - A
- IV - B

Thus, the correct answer is option 1.

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