Question

The tube in a tube plan is not present in the
A) Taenia
B) Pheretima
C) Leech
D) Ascaris

Answer 1

The tube in a tube plan is not present in the
➡️ leech

Answer 2

Ans.

A tube-within-a tube or a tube body plan is a type of body plans in animals, which shows presence of two body openings (one for food and one for waste removal) and a specialized digestive system. The tube in a tube body plan is referred to a fluid-filled cavity, present between the digestive tract and outer body of the organism.

It is present in organisms of phylum Nematoda, such as tube worms (Taenia), Ascaris, and C. elegans. Leech does not show tube body plan. Thus, the correct answer is 'option C). Leech.'