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Biology · ANIMAL KINGDOM

हिन्दी

In which of the following animal groups is the digestive system incomplete (having a single opening serving as both mouth and anus), and the circulatory system absent or of open type respectively?

  1. Annelida and Chordata
  2. Platyhelminthes and Arthropoda
  3. Aschelminthes and Annelida
  4. Echinodermata and Vertebrata

Correct answer · Option 2

Platyhelminthes and Arthropoda

Explanation

Platyhelminthes have an incomplete digestive system with a single opening to the outside of the body. Arthropods possess an open type circulatory system where blood is pumped out of the heart into body cavities.
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