All are correct about acoelomates except:
Correct answer: B. Well-developed respiratory system
- A. Sac type digestive system
- B. Well-developed respiratory system
- C. Parenchyma fills the body space
- D. Well-developed excretory system
Explanation
The correct answer is Option B: Well-developed respiratory system. Acoelomates, such as those in Phylum Platyhelminthes, lack a well-developed respiratory system and rely on diffusion through their body surface for gas exchange. Option A is incorrect because acoelomates have a sac-like digestive system. Option C is incorrect as the body cavity of acoelomates is filled with parenchyma. Option D is incorrect because their excretory system is simple, consisting of structures like protonephridia, rather than being well-developed.
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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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