Which one of the following statements is wrong ?

Options

A. Agar-agar is obtained from Gelidium and Gracilaria
B. Laminaria and Sargassaum are used as food
C. Algae increase the level of dissolved oxygen in the immediate environment
D. Algin is obtained from red algae, and carrageen from brown algae.

Answer

To determine which statement is wrong, let's analyze each of the provided statements one by one:

1. **Agar-agar is obtained from Gelidium and Gracilaria.**
- Agar-agar is indeed a gelatinous substance derived from certain types of red algae, specifically Gelidium and Gracilaria. This statement is correct.

2. **Laminaria and Sargassum are used as food.**
- Laminaria (a type of brown algae) and Sargassum (also a brown algae) are indeed consumed as food in various cultures. This statement is also correct.

3. **Algae increases the level of dissolved oxygen in the immediate environment.**
- Algae, through the process of photosynthesis, do produce oxygen, which increases the level of dissolved oxygen in their surroundings. This statement is correct.

4. **Algin is obtained from Red Algae and Carrageen from Brown Algae.**
- This statement is incorrect. Algin is actually obtained from brown algae, while carrageenan is derived from red algae. Therefore, this statement contains inaccuracies regarding the sources of algin and carrageenan.

**Conclusion:**
The wrong statement among the options provided is the fourth one: "Algin is obtained from Red Algae and Carrageen from Brown Algae."