Tissue means

Options

A. Similar cells having common origin
B. Similar cells having common origin and functions
C. Cells having same metabolic activities
D. Similar cells with same metabolic activity.

Answer

### Step-by-Step Text Solution:

1. **Understanding the Term 'Tissue':**
- The term "tissue" is derived from the French verb meaning "to weave." This indicates that tissues are formed by a collection of cells that work together.

2. **Definition of Tissue:**
- A tissue is defined as a group of cells that share a common origin and perform a specific function. These cells are similar in shape and function.

3. **Characteristics of Tissues:**
- Tissues consist of similar cells that have the same metabolic activity and work together to carry out particular tasks in an organism.

4. **Presence in Organisms:**
- Tissues are not found in unicellular organisms; they are characteristic of multicellular organisms, where they form the building blocks of organs.

5. **Types of Tissues in Animals:**
- In animals, there are four main types of tissues:
- Connective Tissue
- Muscular Tissue
- Nervous Tissue
- Epithelial Tissue

6. **Types of Tissues in Plants:**
- In plants, the main types of tissues include:
- Vascular Tissue
- Epidermal Tissue
- Ground Tissue

7. **Study of Tissues:**
- The study of tissues is known as histology.

8. **Conclusion:**
- Based on the definition and characteristics discussed, the most accurate answer to the question "Tissue means" is: "similar cells having common origin and functions."

### Final Answer:
- Tissue means a group of similar cells having a common origin and functions.