The Question is from neet-botany plant-kingdom , and it was created by the author D VINOD

Question

Which one of the following statements is wrong?

D VINOD · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
	**Primary Concept**:  Algal Products and their Sources
	**Related Topics**:  Algal classification, economic importance of algae, phycocolloids
	**Prerequisites**: Basic knowledge of different types of algae (brown, red, etc.) and their products.
## SOLUTION PATHWAY
**Given Information**:
	The question asks to identify the incorrect statement among given options related to algae.
	We need to examine each statement for accuracy.
**Method & Steps**:
	1. Evaluate statement A: Laminaria and Sargassum are indeed brown algae used as food in many cultures, especially in East Asia.
		Reasoning: Based on common knowledge regarding the uses of brown algae.
		Formula/Rule: N/A
	2. Evaluate statement B: Algae perform photosynthesis, releasing oxygen as a byproduct, hence increasing the dissolved oxygen in their aquatic environment.
		Reasoning: Based on the process of photosynthesis.
		Key Point: Photosynthesis produces oxygen.
	3. Evaluate statement C: Algin is obtained from brown algae, and carrageenan is obtained from red algae. This statement reverses the correct sources.
		Reasoning: Knowledge of the sources of specific phycocolloids.
		Key Point: This is the incorrect statement, as algin is from brown algae and carrageenan from red algae.
	4. Evaluate statement D: Agar-agar is obtained from red algae species such as Gelidium and Gracilaria.
		Reasoning: Based on the known sources of agar-agar.
		Result: The incorrect statement is C.
		Verification: All other options are correct based on common knowledge.
 ## OPTION ANALYSIS
[A] :x: Laminaria and Sargassum are indeed used as food, so this statement is correct.
[B] :x: Algae produce oxygen through photosynthesis, so this statement is correct.
[C] ✓: This statement is incorrect. Algin is obtained from brown algae, and carrageenan from red algae.
[D] :x: Agar-agar is indeed obtained from Gelidium and Gracilaria, so this statement is correct.
 ## LEARNING AIDS
	**Common Mistakes**:
		1.[Error 1]: Confusing the sources of algin and carrageenan. [How to avoid]: Remember that algin comes from brown algae and carrageenan from red algae.
		2.[Error 2]: Not knowing which algae are used as food. [How to avoid]: Study the economic importance of various algae species.
	**Quick Tips**:
		1.[Helpful shortcut]: Think of 'B' for Brown algae and 'A' for algin. Also 'R' for Red algae and 'C' for carrageenan. 
		2.[Memory aid]: Use mnemonics to remember the sources of phycocolloids.

D VINOD · Answer

Laminaria and Sargassum are used as food.

D VINOD · Answer

Algae increase the level of dissolved oxygen in the immediate environment.

D VINOD · Answer

The correct Option is "Algin is obtained from red algae, and carrageenan from brown algae."

D VINOD · Answer

Agar-agar is obtained from Gelidium and Gracilaria.

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