Question

In earthworm, the effective organ for food digestion is

• A. Pharynx
• B. Intestine
• C. Stomach
  
• D. Both B and C

Answer 1

The correct option is A Pharynx

• Earthworm belongs to phylum Annelida which has a tubular body plan.
• It has a pear-shaped muscular pharynx that extends up to the fourth segment.
• The pharyngeal mass or bulb produces mucus and proteolytic enzymes, that are lodged into the salivary chamber before use and the ventral conducting chamber of the pharynx serves as the passage for the ingested food.
• The pharynx acts as a pump in feeding.
• When the mouth is pressed against the bits or humus or mud, then the pharynx undergoes a series of contractions resulting in the food sucking into the buccal chamber and then pumping the same backward into the esophagus.

So, the correct answer is option A.