Malpighian tubules are present at the junction of

Options

A. Foregut and midgut
B. Midgut and hindgut
C. Crop and gizzard
D. lleum and colon

Explanation

### Step-by-Step Solution:

1. **Understanding Malpighian Tubules**:
- Malpighian tubules are excretory organs found in certain organisms, specifically in the class Insecta, which belongs to the phylum Arthropoda.

2. **Identifying the Organism**:
- An example of an organism that possesses Malpighian tubules is the cockroach, which is a member of the class Insecta.

3. **Locating the Alimentary Canal**:
- The alimentary canal of the cockroach consists of three main parts: the foregut, midgut, and hindgut.
- The foregut includes structures like the pharynx, crop, and gizzard.
- The midgut is also known as the mesenteron.
- The hindgut consists of the ileum, colon, and rectum.

4. **Determining the Junction**:
- The question asks where the Malpighian tubules are located. According to the information, Malpighian tubules are situated at the junction of the midgut and hindgut.

5. **Evaluating the Options**:
- Option 1: Junction of foregut and midgut - Incorrect, as the hepatic sac (gastric saccae) is present here.
- Option 2: Junction of midgut and hindgut - Correct, as this is where Malpighian tubules are located.
- Option 3: Junction of crop and gizzard - Incorrect, as there are no Malpighian tubules here.
- Option 4: Junction of ileum and colon - Incorrect, as there are no Malpighian tubules here.

6. **Final Answer**:
- The correct answer is that Malpighian tubules are present at the junction of the midgut and hindgut.