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NTA Abhyas NEET2020BotanyAnimal KingdomPractice

Blind sac body plan is found in the members of

Options

  1. APlatyhelminthes and Aschelminthes
  2. BMolluscs and Echinodermata
  3. CPorfera and Coelenterata
  4. DCoelenterata and Platyhelminthes

Correct answer

D. Coelenterata and Platyhelminthes

Step-by-step solution

The digestive system is incomplete with a single opening (blind sac body plan) that acts as anus and mouth. This body plan is observed in Coelenterates and Platyhelminthes. The digestive system is complete with two openings (tube within tube plan) which behave as anus and mouth separately. This body plan is observed in Aschelminthes to Chordates.

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