Question

In Pheretima, gizzard lies in this segment(s):

• A. 1 - 3
• B. 4
• C. 5 - 7
• D. 8

Hint:

Sequence: B-P-O-G-S-I (Buccal, Pharynx, Oesophagus, Gizzard, Stomach, Intestine). Gizzard grinds (8th).

Answer 1

The Correct Option is D

Step 1: Recall Earthworm (\textit{Pheretima posthuma}) Digestive System:
The alimentary canal is a straight tube with the following segmentation:
Mouth: 1st segment.
Buccal Chamber: 1st - 3rd segments.
Pharynx: 4th segment.
Oesophagus: 5th - 7th segments.
Gizzard: 8th segment (muscular organ for grinding soil).
Stomach: 9th - 14th segments.
Intestine: 15th segment to the last.

Step 2: Identify the Answer:
The gizzard is located in the 8th segment.