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Which among the following is incorrect?

(a) Nereis is a monoecious and Pheretima are dioecious

(b) Annelids have a complete digestive system with Pharynx, Esophagus, Stomach and Intestines

(c) Annelids possess heart and blood vessels

(d) Locusta is one of the sociable Arthropods

I got this question in unit test.

I'm obligated to ask this question of Classification of Animal Kingdom into Different Phylum-3 in portion Animal Kingdom of Biology – Class 11

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The correct answer is (a) Nereis is a monoecious and Pheretima are dioecious

To explain I would say: Nereis is a dioecious and Pheretima are monoecious. Annelids have a complete digestive system with Pharynx, Esophagus, Stomach and Intestines. Annelids possess heart and blood vessels i.e. they have a closed circulatory system. Locusta is one of the sociable Arthropods.

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