Question

Select the correct match of the following pair with respect to the type of coelom exhibited by the organisms:

• A. A- Platyhelminthes, B- Nematodes, C- Annelids
• B. A- Nematodes, B- Annelids, C- Platyhelminthes
• C. A- Platyhelminthes, B- Annelids, C- Nematodes
• D. A- Annelids, B- Platyhelminthes, C- Nematodes

Answer 1

The correct option is A A- Platyhelminthes, B- Nematodes, C- Annelids

• A coelom is a fluid-filled cavity present between the alimentary canal and the body wall. Animals can be divided into three types based on types of coelom namely:
• Acoelomates: These are the animals in which there is no cavity present. The most common example is Platyhelminthes. Figure A represents, acoelomates.
• Pseudocoelomates: These are the animals in which a body cavity is present in addition to the alimentary canal. Mesoderm is present on the outer body wall and not in the gut. Figure B represents Pseudocoelomates. Examples include Nematodes
• Coelomates: In these animals, the coelom is lined by mesoderm both on the inside as well as around the gut. Such types of animals can be categorized into schizocoelomates and enterocoelomates. The given C figure represents, Schizocoelomates in which body cavity is formed from the mesodermal tissue. Examples include annelids, arthropods. etc.
• Thus, the correct answer is option A.