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Question

In most of the Aschelminthes, the respiratory and circulatory systems are absent. Where do they get their oxygen needed for their metabolism?

A
They can absorb oxygen directly from air.
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B
They have special oxygen cylinder attached to them.
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C
They have an air bubble which feeds them.
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D
They obtain oxygen from their host through their body wall.
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Solution

The correct option is D They obtain oxygen from their host through their body wall.
  • The roundworms belong to the group of Aschelminthes.
  • These worms do not have a developed respiratory which can allow the oxygen to enter and circulatory system which can help in the distribution of the oxygen to the different cells.
  • The body wall is thin and allows the oxygen to get diffused in the cells and this allows the organisms to perform the metabolic reactions.
  • Thus, the correct answer is option D.

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