Question

Select a triploblastic schizocoelomate animal with closed type of circulatory system which lacks metamerism
a) Chaetopleura b) Pila c) Echinus d) Octopus

Answer 1

Answer:

The correct answer is option (d) Octopus.

Explanation:

• The ectoderm, mesoderm, and endoderm are the three major germ layers that make up the gastrula in a condition known as triploblasty.
• Any invertebrate animal that has a schizocoel, or coelom, which is the body cavity between the muscles of the body wall and the digestive system, is referred to as a schizocoelomate. Mesodermal mass is the middle germ layer in the embryonic development.
• Squid, octopus, and cuttlefish are all members of the sepia class. Despite being molluscs, these organisms have a closed circulatory system. Tan is the only mollusk without an open circulatory system.
• the state of having a linear arrangement of repeated pieces, each of which is a metamere (a body segment or somite) and which develops sequentially in the embryo from anterior to posterior. It is absent in molluscs (Octopus).

Hence, option (d) is correct.

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