Question

A suctorial mouth is present in
A. Leech
B. Ascaris
C. Tapeworm
D. Earthworm

Answer 1

Hint: Suctorial mouth is a type which is associated with the adaptation of an organism to sucking of substances from other organisms for their survival.

Complete answer:
Let us analyse the options to find the correct answer.
Option A: Leech is an organism that sucks the blood of other organisms for their survival. In order to carry out suction they have the presence of a suctorial mouth which aids the process of suction. Therefore, this is the correct option.

Option B: Ascaris are roundworm and they obtain their nutrition from partially digested food of the host intestine. Therefore, this is the incorrect option.

Option C: Tapeworm are long segmented parasites that live in the host intestine and attach to the inner lining of the intestine. They absorb the partially digested food from the host intestine through their skin. Therefore, this is the incorrect option.

Option D: Earthworms have a saprozoic mode of nutrition as they eat the soil which has a high content of organic matter formed from decaying leaves. Therefore, this is the incorrect option.

Thus, the correct option is A) Leech.

Additional information:
- Leeches are ectoparasites and have a sanguivorous habitat of obtaining food and nutrition.
- Their suctorial mouth is a Y-shaped saw that makes a painless incision in the host’s body from which blood is completely sucked out.

Note: Tapeworms have suckers and hookers that allow them to stick their heads to the host intestine for absorption of food through their skin. Tapeworms belong to the class Cestoda under the phylum Platyhelminthes.