Convenient groups which we use to study the organisms in classification are called :-

Options

A. Order
B. Class
C. Division
D. Taxa

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the term used to describe the convenient groups that are utilized in the classification of organisms.

2. **Identifying the Options**: The options provided are:
- A) Order
- B) Class
- C) Division
- D) Taxa

3. **Definition of Taxa**: In biological classification, the term "taxa" (plural of taxon) refers to the groups or categories into which organisms are classified. Each group represents a rank in the hierarchy of classification.

4. **Hierarchy of Classification**: The classification system is hierarchical, and the major ranks include:
- Kingdom
- Phylum (or Division in plants)
- Class
- Order
- Family
- Genus
- Species

5. **Conclusion**: Since the question specifically asks for the term that encompasses all these groups, the correct answer is "Taxa".

6. **Final Answer**: The convenient groups used to study organisms in classification are called **Taxa**.

---