Arrange the parts of alimentary canal in an order
A) Rectum `"     "` B) Intestine
C) Stomach `"    "` D) Gizzard 
E) Oesophagus `"     "` F) Buccal cavity
G) Pharynx `"     "` H) mouth
I) Anus 

Options

A. E-F-G-I-H-D-A-B-C
B. H-E-I-F-B-A-D-C-G
C. A-C-B-D-F-G-H-I-E
D. H-F-G-E-D-C-B-A-I

Answer

To arrange the parts of the alimentary canal in the correct order, we will follow the sequence of the digestive system as it occurs in an earthworm. Here’s the step-by-step breakdown:

1. **Mouth (H)**: The alimentary canal begins at the mouth, where food intake occurs.
2. **Buccal Cavity (F)**: After the mouth, food enters the buccal cavity, where it is further processed.
3. **Pharynx (G)**: The food then moves into the pharynx, which helps in swallowing.
4. **Oesophagus (E)**: Following the pharynx, the food passes into the oesophagus, which connects to the gizzard.
5. **Gizzard (D)**: The gizzard grinds the food, aiding in its digestion.
6. **Stomach (C)**: After the gizzard, the food enters the stomach, where it is mixed with digestive juices.
7. **Intestine (B)**: The partially digested food then moves into the intestine for further digestion and nutrient absorption.
8. **Rectum (A)**: The waste material is then stored in the rectum before excretion.
9. **Anus (I)**: Finally, the waste is expelled from the body through the anus.

Thus, the correct order of the parts of the alimentary canal is:
**H, F, G, E, D, C, B, A, I**