Agar is obtained from

Options

A. Polysiphonia and Porphyra
B. Chlamydomonas and Spirogyra
C. Gelidium and Gracilaria
D. Chara and Chlamydomonas

Answer

To find out where agar is obtained from, we can follow these steps:

### Step-by-Step Solution:

1. **Understand what Agar is**: Agar, also known as agar-agar, is a jelly-like substance used in various culinary and scientific applications.

**Hint**: Remember that agar is often used in food and microbiological media.

2. **Identify the source of Agar**: Agar is primarily derived from certain species of red algae, which belong to the phylum Rhodophyta.

**Hint**: Think about the types of algae and their classifications.

3. **List the species that produce Agar**: The two main species of red algae from which agar is obtained are Gelidium and Gracilaria.

**Hint**: Focus on the specific names of the algae that are known to produce agar.

4. **Evaluate the options given**: The question provides several options:
- Polysiphonia and Porphyra
- Chlamydomonas and Spirogyra
- Gelidium and Gracilaria
- Cara and Chlamydomonas

**Hint**: Compare the options with the known sources of agar.

5. **Select the correct answer**: Among the options, Gelidium and Gracilaria are the correct sources of agar.

**Hint**: Look for the option that includes both Gelidium and Gracilaria.

### Final Answer:
Agar is obtained from **Gelidium and Gracilaria**, which are members of the red algae (Rhodophyta).