Pick out lectin from those given below:

Options

A. Gum
B. Diterpene
C. Concanavillin
D. Curcumin

Answer

To identify the lectin from the given options (gum, diterpenes, concanavalin, and curcumin), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definition of Lectins**:
- Lectins are a type of protein that can bind to carbohydrates. They are classified as secondary metabolites, which are not essential for plant growth but play crucial roles in plant survival and interaction with the environment.

2. **Analyze the Given Options**:
- **Gum**: This is a polymeric substance, primarily composed of polysaccharides. It does not fit the definition of lectins.
- **Diterpenes**: These are a class of terpenoids, which are also not classified as lectins.
- **Concanavalin**: This is a well-known lectin derived from the jack bean (Canavalia ensiformis). It specifically binds to certain carbohydrates, fitting the definition of a lectin.
- **Curcumin**: This is a bioactive compound found in turmeric, known for its medicinal properties, but it is not a lectin.

3. **Identify the Correct Answer**:
- Among the options provided, concanavalin is the only one that is classified as a lectin.

### Final Answer:
The correct answer is **Concanavalin** (Option 3).

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