Choose the wrongly matched pair ragarding the position of reproductive structures in earthworm

Options

A. Testes - 10th and 11th segments
B. Spermathecae - 6th to 9th segments
C. Male genital pore - 9th segment
D. Female genital pore - 14th segment

Answer

To solve the question regarding the wrongly matched pair concerning the position of reproductive structures in earthworms, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Earthworm Structure**:
- Earthworms belong to the phylum Annelida and exhibit metamerism, meaning their body is segmented. Each segment may contain repeated organs.

2. **Identify the Reproductive Structures**:
- The main reproductive structures in earthworms include testes, spermathecae, male genital pore, and female genital pore.

3. **Locate the Testes**:
- The testes are found in the **10th and 11th segments** of the earthworm.

4. **Locate the Spermathecae**:
- The spermathecae are located from the **5th to the 9th segments**. There are four pairs of spermathecal apertures on the ventrolateral sides.

5. **Locate the Male Genital Pore**:
- The male genital pore is located in the **18th segment**, not the 9th segment as sometimes incorrectly stated.

6. **Locate the Female Genital Pore**:
- The female genital pore is a single pore located in the **14th segment**, positioned in the mid-ventral line.

7. **Identify the Incorrect Match**:
- The question asks for the wrongly matched pair. Since the male genital pore is stated to be in the 9th segment (which is incorrect), this is the answer to the question.

### Final Answer:
The wrongly matched pair regarding the position of reproductive structures in earthworms is that the **male genital pore is located in the 9th segment** (it should be in the 18th segment).

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