Question

cockroach has open circulatory system. why do we call it as open circulation system ? mention any two animals that have open circulation system?

Answer 1

In open circulation the blood does not remain confined within the blood vessels but comes in contact with the body cavity. The blood is opened to the body cavity and so it is called open circulation.

2 other animals are prawn and snail.

Other than cockroach (arthropod)open ciculation is found mostly in mollusks and almost all invertebrates except earthworm .

Answer 2

Open circulatory system is a system that do not include blood vessels, blood is directly flowing in Body coelom
Ex- Arthopoda and molluscs