Mannitol is the stored food in :-

Options

A. Gracillaria
B. Chara
C. Porphyra
D. Fucus

Answer

To determine where mannitol is stored as food, we can follow these steps:

### Step 1: Understand the context of mannitol
Mannitol is a type of sugar alcohol that can serve as a storage carbohydrate in certain organisms. It is essential to identify which organisms store mannitol as a food source.

### Step 2: Identify the organisms mentioned
The organisms mentioned in the video transcript are:
- Glacieraria
- Chara
- Porphyra
- Fucus

### Step 3: Analyze the storage forms of food in each organism
- **Glacieraria**: Stores food in the form of mannitol.
- **Chara**: Stores food primarily as starch and oil, so it does not store mannitol.
- **Porphyra**: Stores food as Floridian starch and Galactan polymers, not mannitol.
- **Fucus**: Stores food in the form of mannitol, along with Laminarin and oil.

### Step 4: Conclude the correct answer
From the analysis, we find that mannitol is stored as food in **Fucus**. Therefore, the answer to the question is:

**Answer: Fucus**

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