What is the correct order in decreasing size in taxonomic hierarchy ?

Options

A. Kingdom , phylum, class , order , family, genus and species
B. Kingdom , phylum, class , order , family, species and genus.
C. Kingdom , phylum, class ,species, order, family and genus.
D. Kingdom, species , phylum, class , order, family and genus .

Answer

To determine the correct order in decreasing size in the taxonomic hierarchy, we need to understand the levels of classification in biology. Here’s a step-by-step breakdown:

### Step 1: Identify the highest taxonomic category
The highest taxonomic category is the **Kingdom**. This is the broadest classification that groups together all forms of life that share fundamental characteristics.

**Hint:** Remember that the Kingdom is the largest grouping in the taxonomic hierarchy.

### Step 2: Identify the next level
The next level below Kingdom is **Phylum**. Each kingdom is divided into several phyla (plural of phylum), which group organisms based on major body plans and structural features.

**Hint:** Think of phylum as a way to categorize organisms based on their basic structural similarities.

### Step 3: Identify the next level
Following Phylum, we have **Class**. Each phylum is further divided into classes, which group organisms that share even more specific characteristics.

**Hint:** Classes are more specific than phyla and often reflect evolutionary relationships.

### Step 4: Identify the next level
After Class, the next level is **Order**. Each class is divided into orders, which consist of families of organisms that are closely related.

**Hint:** Orders can be thought of as a way to further refine the classification of organisms within a class.

### Step 5: Identify the next level
Next in the hierarchy is **Family**. Each order is divided into families, which group organisms that are even more closely related.

**Hint:** Families contain genera (plural of genus) that share common traits.

### Step 6: Identify the next level
Following Family, we have **Genus**. Each family contains one or more genera, which group together species that are very closely related.

**Hint:** The genus is a way to group species that are similar and share a common ancestor.

### Step 7: Identify the lowest level
Finally, the lowest level in the taxonomic hierarchy is **Species**. This is the most specific classification and refers to a group of individuals that can interbreed and produce fertile offspring.

**Hint:** Species is the most specific category and represents individual organisms that are alike.

### Conclusion
Putting it all together, the correct order in decreasing size in taxonomic hierarchy is:
1. Kingdom
2. Phylum
3. Class
4. Order
5. Family
6. Genus
7. Species

Thus, the final answer is: **Kingdom > Phylum > Class > Order > Family > Genus > Species**.