Indigestible plant matter that dissolves in water is called

Options

A. Pectin
B. Gum
C. Hemicellulose
D. Soluble fibre.

Answer

To solve the question "Indigestible plant matter that dissolves in water is called," we can follow these steps:

### Step 1: Understand the Question
The question is asking for a specific type of plant matter that is indigestible and can dissolve in water.

### Step 2: Identify Types of Plant Matter
We know that plant matter can be classified into different types, particularly fibers. There are two main categories of dietary fiber: soluble and insoluble fibers.

### Step 3: Define Soluble and Insoluble Fibers
- **Soluble fibers**: These fibers dissolve in water and can form a gel-like substance. They are not digestible by human enzymes but can be fermented by bacteria in the gut.
- **Insoluble fibers**: These fibers do not dissolve in water and are resistant to digestive enzymes.

### Step 4: Analyze the Options
The options provided are:
1. Pectin
2. Gum
3. Hemicellulose
4. Soluble fiber

From the definitions:
- Pectin is a type of soluble fiber that dissolves in water.
- Gum is also a soluble fiber that dissolves in water.
- Hemicellulose can be both soluble and insoluble, but it is often classified as insoluble.
- Soluble fiber is a general term that refers to all fibers that dissolve in water.

### Step 5: Determine the Correct Answer
Since the question specifically asks for "indigestible plant matter that dissolves in water," the most accurate answer is **soluble fiber** as it encompasses all types of soluble fibers, including pectin and gum.

### Final Answer
The correct answer is **soluble fiber**.

---