Sequence of passage of undigested waste from large intestine to exterior is 

Options

A. Rectum-anus-cloacal aperture - cloacal sac - exterior
B. Rectum - anus - cloacal sac - cloacal aperture - exterior
C. Cloacal sac - rectum - anus - cloacal aperture - exterior
D. Rectum - cloacal sac - cloacal aperture - anus - exterior

Answer

To determine the sequence of passage of undigested waste from the large intestine to the exterior, we need to follow the anatomical pathway that waste takes in the digestive system. Here’s the step-by-step breakdown:

1. **Large Intestine**: The undigested waste is stored in the large intestine after the digestion process is completed in the earlier parts of the digestive tract.

2. **Rectum**: The first structure that the undigested waste passes through is the rectum. The rectum serves as a temporary storage site for feces before they are expelled from the body.

3. **Anus**: After the rectum, the waste moves to the anus. The anus is the opening at the end of the digestive tract through which the feces are expelled from the body.

4. **Cloacal Sac**: In certain animals, such as frogs, after the anus, the waste may move into the cloacal sac. The cloacal sac is a part of the cloaca, which is a common cavity for the excretion of both waste and reproductive products.

5. **Cloacal Aperture**: The waste then passes through the cloacal aperture, which is the external opening of the cloaca.

6. **Exterior**: Finally, the undigested waste is expelled to the exterior of the body.

Thus, the correct sequence of passage of undigested waste from the large intestine to the exterior is:
**Rectum → Anus → Cloacal Sac → Cloacal Aperture → Exterior.**