The animal which has a gut with single opening is:
Correct answer: A. Planaria
- A. Planaria
- B. Cockroach
- C. Earthworm
- D. Roundworm
Explanation
The correct answer is Planaria. Planaria are flatworms with a digestive system that consists of a single opening, known as a gastrovascular cavity, serving both as an entry for food and an exit for waste. This is a characteristic of simpler, more primitive organisms.
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About Kingdom Animalia
Animals are multicellular, heterotrophic eukaryotes whose cells lack cell walls and chloroplasts, with specialised tissues in most groups. Coverage includes body symmetry, tissue layers, coelom, segmentation and levels of organisation, plus major phyla such as Porifera, Cnidaria, Platyhelminthes, Annelida, Arthropoda, Mollusca and Chordata.
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