Select the hierarchy (descending) of the taxonomic ranks using the codes given below :
(A) Order (B) Genus (C) Class (D) Species (E) Family
Codes :

Question

Select the hierarchy (descending) of the taxonomic ranks using the codes given below : 
(A) Order (B) Genus (C) Class (D) Species (E) Family 
Codes :

Accepted Answer

The task is to determine the correct hierarchy (descending order) of taxonomic ranks using the given codes. The correct answer is Option 1: CAEBD. Let's break down why this is the correct order and why the other options are incorrect.

### Explanation for Option 1 (Correct Answer: CAEBD)

1. **Class (C)**: In the taxonomic hierarchy, the class is a higher rank than order, family, genus, and species. It is one of the major taxonomic ranks and includes multiple orders.
   
2. **Order (A)**: Following class, the next rank is order. An order contains one or more families. It is more specific than class but still broader than family, genus, and species.

3. **Family (E)**: After order, the next rank is family. A family groups together several genera (plural of genus) that share certain similarities.

4. **Genus (B)**: The genus is a rank below family. It includes species that are closely related and very similar.

5. **Species (D)**: This is the most specific rank in the hierarchy. A species is a group of individuals that can interbreed and produce fertile offspring.

Thus, the correct descending order is Class, Order, Family, Genus, Species, which corresponds to the code CAEBD.

### Explanation for Why Other Options Are Incorrect

- **Option 2 (ACEDB)**: This option incorrectly places Order (A) before Class (C), which is not correct as class is a higher rank than order. Additionally, it places Family (E) before Genus (B), which is correct, but the initial error makes the entire sequence incorrect.

- **Option 3 (CEABD)**: This option correctly starts with Class (C) and Order (A), but it incorrectly places Genus (B) before Family (E). In the taxonomic hierarchy, family is a broader category than genus, making this sequence incorrect.

- **Option 4 (BDEAC)**: This option starts with Genus (B) and Species (D), which are lower ranks, and incorrectly places them before higher ranks like Class (C), Order (A), and Family (E). This sequence is entirely incorrect as it does not follow the descending order from broader to more specific categories.

In conclusion, Option 1 (CAEBD) is the only sequence that correctly follows the descending order of taxonomic ranks from Class to Species.