Question

Alimentary canal is not found in
A. Arachnida
B. Apoda
C. Gastropoda
D. Cestoda

Answer 1

Hint: A muscular pipe that runs from the mouth to the anus is the alimentary canal, the mouth through which food enters; and the anus through which unabsorbed material exits the body.

Complete Answer:
- The alimentary channel varies widely in the organism, but is seen only in the organism that is bilaterally symmetrical.
- Various portions of the alimentary canal contain cells that secrete digestive enzymes, allowing food to be broken down. Other specialised cells make it possible for materials to be absorbed into the body. In human and other highly complex organisms, the alimentary canal is organised into specialised tissues and organs.
- Types of animals, such as birds, have a completely different set of organs in the alimentary canal and have structures not seen in humans. For example, birds also have a gizzard, which is a muscle organ used to grind food before it reaches the stomach.
- Mammals do not need this organ because they have the ability to chew their food.Glands that secrete digestive compounds, poisonous fangs and teeth, and specially adapted intestines that help animals absorb food are other adaptations to the food canal.
- Under the flatworm community of species, Cestoda falls. There is no mouth or buccal cavity for this community of species.
- They have tubes where the nutrients from the host 's alimentary canal are ingested. Now the arthropods are Decapoda and Arachnida.
- They have an alimentary canal consisting of the 'oesophagus and stomach'. There are several arthropods with underdeveloped food ducts. Apoda, on the other hand , comes under the chordates and has a highly developed alimentary canal.

The correct answer is option(D) Cestoda.

Note: There are trillions of microbes in the gastrointestinal tract, with some 4,000 different strains of bacteria playing various functions in maintaining immune health and metabolism.