Question

Animals with pseudocoelom is
A) Amia/leach
B) Lepisma/liver fluke
C) Dragonfly/Jellyfish
D) Wuchereria/Hookworm/Roundworm

Answer 1

Hint: Pseudocoelom is present in between the mesoderm and the endoderm layers. Coelom is inside the mesoderm. It can be filled with blood, and also it covers the internal organs. Pseudocoelom rises from blastocoel during the development of embryos. In the question they are asking about the animals that possess pseudocoelom.

Complete answer:
There is a body cavity that runs down centrally across the organism that is known as “coelom”. The coelom is completely surrounded by mesodermal tissue and it is between the body wall and the intestinal canal.
If an organism has true coelom, it allows more rigid structure due to hydrostatic properties of the fluid being filled with fluid, it makes the skeletal system more functional. It also aids in elimination of waste, ventilation, digestion etc.
Pseudocoelom is present in animals that belong to the phylum Nematoda or Achelminthes.
Now explore the options one by one.
Leech belongs to phylum Annelida. Hence it is an incorrect option.
Liverfluke belongs to the phylum Platyhelminthes. Therefore it is also an incorrect answer.
Dragonfly belongs to phylum Arthropoda. Therefore it is also an incorrect option
Wuchereria belongs to phylum Nematoda.

Therefore, option (d) is correct.

Note:
Humans have coelom in them. During their development, the cavity is split into separate parts of the body. Wuchereria is a nematode and responsible for the disease that is known as elephantiasis. Coelom is divided into 3 types: Eucoelom, Pseudocoelom and Acoelom. This classification is based on the presence or absence of coelom in the body cavity.