Which one of the following statements is wrong ?

Options

A. Chorella and Spirulina are used as space food
B. Mannitol is stored food in Rhodophyceae
C. Algin and carragen are products of algae.
D. Agar -agar is obtained form Gelidium and Gracilaria

Answer

To determine which statement is wrong among the given options, we can analyze each statement one by one.

### Step-by-Step Solution:

1. **Evaluate the First Statement:**
- **Statement:** Chlorella and Spirulina are used as space food.
- **Analysis:** This statement is true. Chlorella and Spirulina are types of algae that are rich in nutrients and are indeed used as food sources in space missions due to their high protein content and nutritional value.

2. **Evaluate the Second Statement:**
- **Statement:** Mannitol is stored food in Rhodophyce.
- **Analysis:** This statement is incorrect. Rhodophyce, or red algae, primarily store food in the form of starch, not mannitol. Mannitol is associated with other types of algae, but not specifically with Rhodophyce.

3. **Evaluate the Third Statement:**
- **Statement:** Algin and carrageen are products of algae.
- **Analysis:** This statement is true. Algin and carrageenan are polysaccharides derived from algae and are commonly used as food additives, thickeners, and stabilizers.

4. **Evaluate the Fourth Statement:**
- **Statement:** Agar agar is obtained from Gelidium and Gracilaria.
- **Analysis:** This statement is true. Agar agar is indeed obtained from the cell walls of certain red algae, specifically Gelidium and Gracilaria, and is widely used as a solidifying agent in microbiological media.

### Conclusion:
- The only incorrect statement among the options provided is the second statement: "mannitol is stored food in Rhodophyce."

### Final Answer:
The wrong statement is: **"mannitol is stored food in Rhodophyce."**

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