Simple tissue is defined as

Options

A. Group of similar cells which are common in origin.
B. Different types of cells performing same functions
C. Different types of cells performing same functions
D. Organised group of cells performing many functions.

Answer

### Step-by-Step Text Solution:

1. **Understanding Tissues**: Begin by defining what tissues are. Tissues are groups of cells that work together to perform specific functions in an organism.

2. **Types of Tissues**: Recognize that there are different types of tissues. The question specifically asks about simple tissues.

3. **Definition of Simple Tissue**: Simple tissue is defined as a type of tissue that consists of only one type of cell. This means that all the cells in this tissue are similar in structure and function.

4. **Characteristics of Simple Tissue**:
- **Homogeneity**: All cells are of the same kind.
- **Common Origin**: The cells in simple tissue have a common origin, meaning they arise from the same type of precursor cells.
- **Functionality**: The cells perform similar functions.

5. **Examples in Animals and Plants**: In animals, simple tissues are referred to as epithelium, while in plants, they are known as epidermis.

6. **Types of Simple Tissues**: There are three main types of simple tissues in plants: parenchyma, collenchyma, and sclerenchyma.

7. **Conclusion**: Based on the definition and characteristics discussed, the correct answer to the question "Simple tissue is defined as" is "group of similar cells which are common in origin."