Agar-agar is obtained from Gelidium and Gracilaria. It is used to grow microbes and in preparations of ice-creams and jellies. These are the members of:

Options

A. Green Algae
B. Red Algae
C. Brown Algae
D. Blue green Algae

Answer

To answer the question regarding the source of agar-agar and its classification, we can follow these steps:

### Step 1: Identify the source of agar-agar
Agar-agar is obtained from two specific genera: Gelidium and Gracilaria.

### Step 2: Understand the uses of agar-agar
Agar-agar is widely used in microbiology for growing microbes and in the food industry for making ice creams and jellies.

### Step 3: Classify Gelidium and Gracilaria
Both Gelidium and Gracilaria are types of algae. Algae are categorized into different classes based on their characteristics.

### Step 4: Determine the class of these algae
Among the classes of algae, we have:
- Green Algae (Chlorophyceae)
- Red Algae (Rhodophyceae)
- Brown Algae (Phaeophyceae)
- Blue-Green Algae (Cyanobacteria)

Gelidium and Gracilaria belong to the Red Algae class (Rhodophyceae).

### Step 5: Conclusion
Thus, the correct classification for Gelidium and Gracilaria, the sources of agar-agar, is that they are members of Red Algae.

### Final Answer:
Agar-agar is obtained from Gelidium and Gracilaria, which are members of Red Algae.

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