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Which among the following is incorrect about Cyclostomata?

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in Biology – Class 11 by (272k points)
Which among the following is incorrect about Cyclostomata?

(a) Their vertebral column is made of cartilage

(b) Lamprey and hagfish are examples of this class

(c) Their digestive system is complete with stomach, food pipe and intestines

(d) Their circulatory system is closed with a 2 chambered heart

The question was posed to me during an interview.

I'm obligated to ask this question of Classification of Animal Kingdom into Different Phylum-2 in portion Animal Kingdom of Biology – Class 11

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Correct answer is (c) Their digestive system is complete with stomach, food pipe and intestines

Explanation: Vertebral column is made of cartilage in Cyclostomata. They don’t have a stomach. Their circulatory system is closed with a 2 chambered heart. Lamprey and hagfish are examples of this class.

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