NTA Abhyas NEET2020BotanyAnimal KingdomPractice
In Platyhelminthes, the digestive system is incomplete because
Options
- Ait absorbs food from general body surface
- Bit has suckers and hooks in parasitic form
- Cit has only one opening that serves as mouth and anus
- DAll of the above
Correct answer
C. it has only one opening that serves as mouth and anus
Step-by-step solution
Animal kingdom consists of two phylas. Phylum non chordates and chordates. Non chordates consist of Porifera, Colenterates, Ctenophora, Platyhelminthes, Aschelminthes, Annelids, Arthropods, Molluscs, Echinodematas. Hemichordata etc. Platyhelminthes involves flatworms as they do not have body cavity. The body consists of organs but no organ systems. Thus digestive system is also incomplete. It means the system consists of only one opening that serves as both mouth and anus. This is seen in animals like hydra etc.