Question
Assertion [A]: Platyhelminths are acoelomates.
Reason [R]: Platyhelminths develop three primary germ layers during early embryogenesis.
Reason [R]: Platyhelminths develop three primary germ layers during early embryogenesis.
Answer: Option A
:
A
In platyhelminths,spongy connective tissue (mesenchyme) constitutes the so-called parenchyma and fills the space between organs.So there is no space available for the formation of coelom, as a result, they are acoelomates. The external appearance of flatworms (dorsoventrally flattened) is an indication of their acoelomate nature. This feature is also an adaptation for theirparasitic mode of nutrition. Platyhelminths are triploblastic, indicating that they develop threeprimary germ layers during early embryogenesis. This is another common feature of all flatworms; it is not a reason for their acoelomate nature.
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:
A
In platyhelminths,spongy connective tissue (mesenchyme) constitutes the so-called parenchyma and fills the space between organs.So there is no space available for the formation of coelom, as a result, they are acoelomates. The external appearance of flatworms (dorsoventrally flattened) is an indication of their acoelomate nature. This feature is also an adaptation for theirparasitic mode of nutrition. Platyhelminths are triploblastic, indicating that they develop threeprimary germ layers during early embryogenesis. This is another common feature of all flatworms; it is not a reason for their acoelomate nature.
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