In cockroach, identify the parts of the foregut in correct sequence :-

Options

A. `Mouth rarr Oesophagus rarr Pharynx rarr Crop rarr Gizzard`
B. `Mouth rarr Crop rarr Pharynx rarr Oesophagus rarr Gizzard`
C. `Mouth rarr Gizzard rarr Crop rarr Pharynx rarr Oesophagus`
D. `Mouth rarr Pharynx rarr Oesophagus rarr Crop rarr Gizzard`

Answer

To identify the parts of the foregut in a cockroach in the correct sequence, we can break down the process step by step:

1. **Mouth**: The digestive process begins at the mouth, where food enters the digestive system.

2. **Pharynx**: After the mouth, food passes into the pharynx. The pharynx is located at the lower portion of the mouth and serves as a passageway for food.

3. **Esophagus**: Following the pharynx, the food travels down the esophagus. The esophagus is a long tube that connects the pharynx to the crop.

4. **Crop**: The next part is the crop, which is a bulge that serves as a storage area for food. Here, food can be stored temporarily before it moves on to the next stage of digestion.

5. **Gizzard**: Finally, the food reaches the gizzard. The gizzard is a muscular organ that grinds the food, aiding in the mechanical digestion process.

Putting it all together, the correct sequence of the parts of the foregut in a cockroach is:
- Mouth
- Pharynx
- Esophagus
- Crop
- Gizzard

Thus, the correct answer is option number 4.