Which of the following algae is used to prepare culture medium to grow microbe ?

Options

A. Gelidium
B. Laminaria
C. Chlorella
D. Both (A) and (B)

Answer

To solve the question "Which of the following algae is used to prepare culture medium to grow microbe?", we will analyze the options provided and determine which one is correct based on their uses.

### Step 1: Identify the options
The options given are:
1. Gelidium
2. Laminaria
3. Chlorella
4. Both A and B

### Step 2: Understand the uses of each algae
- **Gelidium**: This algae is known for its ability to produce agar-agar, a gelatinous substance that is widely used in laboratories to prepare culture media for growing microbes. Agar-agar serves as a solidifying agent in microbiological media.

- **Laminaria**: This algae is primarily used for its medicinal properties, such as aiding in weight loss and acting as a bulk laxative for constipation. It is not typically used for preparing culture media for microbes.

- **Chlorella**: This is a type of green algae that is often used as a dietary supplement due to its nutritional value. It has various health benefits, including potential cancer prevention and immune system stimulation, but it is not used for preparing culture media.

### Step 3: Analyze the options
From the analysis:
- Gelidium is the only algae among the options that is specifically used to prepare culture media for growing microbes.
- Laminaria and Chlorella have medicinal uses but are not used for this purpose.

### Step 4: Conclusion
The correct answer to the question is **Gelidium**.

### Final Answer:
**Gelidium** is the algae used to prepare culture medium to grow microbes.

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