Question

To which of the following phylum, class trematoda belongs?
A. Platyhelminthes
B. Arthropoda
C. Mollusca
D. Annelida

Answer 1

Hint: Trematoda is a subphylum of the Platyhelminthes phylum. It consists of two types of parasitic flatworms called flukes. Mollusks and vertebrates have internal parasites. The life cycle of most trematodes is complicated, involving at least two hosts. A vertebrate is the principal host, where the flukes sexually reproduce.
A digenean trematode species' usual life cycle will include at least one intermediate host and one definitive host. Normally, eggs are thrown into water, where they must either be consumed by a host or hatch into the free-swimming larval form.

Complete answer:
Option A: The phylum platyhelminthes includes the class trematoda. Flatworms are parasitic in nature and are flatworms. The diploblastic body distinguishes these. For excretion, these have flame cells. They have a neural network, but their neurological system is underdeveloped.
So, option A is correct.
Option B: Flukes (Trematoda) are parasitic worms that belong to the Platyhelminthes phylum.
So, option B is not correct.
Option C: Platyhelminthes are divided into three groups based on their body form and environment. Trematoda and cestoda Turbellaria
So, option C is not correct.
Option D: The class trematoda belongs to the phylum platyhelminthes. Flatworms are flatworms that are parasitic in nature. These are distinguished by their diploblastic bodies. These have flame cells for excretion. Their neuronal network is formed, but their neurological system is not.
So, option D is incorrect.

Hence, Option A is the correct answer.

Note:
Phylum Platyhelminthes is a member of the Animalia kingdom. Flatworms are another name for the organisms. Acoelomates are a type of life that includes both free-living and parasitic organisms.
Flatworms, also known as flatworms, flatworms, Platyhelminthes, or platyhelminthes, are a phylum of relatively basic bilaterian, soft-bodied invertebrates.
The following are some of the traits that separate Platyhelminthes from others:
1. Flame cells are present.
2. Nervous system that looks like a ladder.
3. In the bodily cavity, there is parenchyma.
4. Self-fertilization.