Question

Which one of the following has an open
circulatory system ?
(a) Periplaneta (b) Hirudinaria
(c) Octopus (d) Pheretima

Answer 1

Answer:

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Explanation:

Periplaneta belongs to Arthropoda which has bilateral symmetry and have jointed legs. Arthropods have an open circulatory system where the blood, flows in open spaces known as haemocoel and it bathes the cells directly. The blood in the cockroach is known as haemolymph. Instead of blood cells, less efficient oxygen-carrying pigments known as hemocytes float freely in the hemocoel.

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Answer 2

Answer:

a is the correct answer