AIIMS 2018 Zoology Biology MCQ Question
Which of the following option is correct?
Osteichthyes 4 pairs of gill slits covered by operculum
Chondrichthyes 6-15 pairs of gill slits
Arthropoda Metamerism and excretion by nephridia
Platyhelminthes Bilateral symmetry & coelomate e.g., Taenia and Fasciola
Correct Answer
Detailed Explanation
The correct answer is A) Osteichthyes 4 pairs of gill slits covered by operculum because Osteichthyes, or bony fish, typically possess a single pair of gill arches covered by an operculum, which protects the gills and aids in respiration. In contrast, Chondrichthyes (sharks and rays) have multiple gill slits without an operculum, while the other options incorrectly describe features of Arthropoda and Platyhelminthes, which do not align with their defining characteristics.
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