Question

Select the correct sequence of organs in the alimentary canal of cockroach starting from mouth:

• A. $\text{Pharynx}\to \text{Oesophagus}\to \text{Gizzard}\to \text{Ileum}\to \text{Crop}\to \text{Colon}\to \text{Rectum}$
• B. $\text{Pharynx}\to \text{Oesophagus}\to \text{Ileum}\to \text{Crop}\to \text{Gizzard}\to \text{Colon}\to \text{Rectum}$
• C. $\text{Pharynx}\to \text{Oesophagus}\to \text{Crop}\to \text{Gizzard}\to \text{Ileum}\to \text{Colon}\to \text{Rectum}$
• D. $\text{Pharynx}\to \text{Oesophagus}\to \text{Gizzard}\to \text{Crop}\to \text{Ileum}\to \text{Colon}\to \text{Rectum}$

Answer 1

The correct option is C $\text{Pharynx}\to \text{Oesophagus}\to \text{Crop}\to \text{Gizzard}\to \text{Ileum}\to \text{Colon}\to \text{Rectum}$

The mouth opens into a short tubular pharynx, leading to a narrow tubular passage called oesophagus. This in turn opens into a sac like structure called crop used for storing of food. The crop is followed by gizzard or proventriculus. This again opens to ileum, colon and rectum. The rectum opens out through anus. So, the correct sequence of organs in the alimentary canal of cockroach starting from mouth is:
Pharynx $\to$ Oesophagus $\to$ Crop $\to$ Gizzard $\to$ Ileum $\to$ Colon $\to$ Rectum.