Which of the following is incorrect about glycogen ?

Options

A. It is a stored form of glucose in animals.
B. In glycogen , the right end is reducing and the left end is non - reducing .
C. It is a branched polymer of glucose.
D. It is a stored form of glucose in plants

Answer

To determine which statement about glycogen is incorrect, let's analyze each option step by step:

### Step 1: Analyze the first option
**Statement:** "It is a stored form of glucose in animals."
- **Explanation:** Glycogen is indeed the primary storage form of glucose in animals. It is stored mainly in the liver and muscles.
- **Conclusion:** This statement is **correct**.

### Step 2: Analyze the second option
**Statement:** "In glycogen, the right end is reducing and the left end is non-reducing."
- **Explanation:** Glycogen has a branched structure. The reducing end is the end of the molecule that can act as a reducing agent, while the non-reducing end cannot. In glycogen, the right end (the end with a free anomeric carbon) is indeed the reducing end, and the left end is the non-reducing end.
- **Conclusion:** This statement is **correct**.

### Step 3: Analyze the third option
**Statement:** "It is a branched polymer of glucose."
- **Explanation:** Glycogen is a polymer made up of glucose units, and it is characterized by its branched structure due to the presence of α(1→6) glycosidic bonds in addition to the linear α(1→4) glycosidic bonds.
- **Conclusion:** This statement is **correct**.

### Step 4: Analyze the fourth option
**Statement:** "It is a stored form of glucose in plants."
- **Explanation:** This statement is incorrect. The stored form of glucose in plants is starch, not glycogen. Starch is also a polymer of glucose but differs in structure and function from glycogen.
- **Conclusion:** This statement is **incorrect**.

### Final Conclusion
The incorrect statement about glycogen is: **"It is a stored form of glucose in plants."**

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