Question

Open circulatory system is found in
A. Man
B. Insects
C. Reptiles
D. Aves

Answer 1

Hint:-In lower organisms, the open circulatory system is present and in higher organisms open circulatory systems are present. Open circulatory system is found mostly in invertebrates and the closed circulatory system is found in both invertebrates and vertebrates.

Complete step-by-step solution:
In the open type, circulatory system tissues and cells of the body are directly bathed in blood, pumped by the heart when the blood flows in open spaces.
In this type of circulatory systems exchange of material occurs directly between the blood and tissues or body cells. This type of circulatory systems present in Non-cephalopod, Arthropods, tunicates, and hemichordates. In Closed typed of the circulatory system, blood is circulated by a network of blood vessels different of blood vessels of different diameter It means Capillaries, arteries and veins there is a lack of direct contact between blood and body cells. Man belongs to Chordata and chordates have a closed circulatory system. Insects belong to Arthropods and arthropods have an open system.
Reptiles and Aves belong to Chordata and have a closed circulatory system. A system or network of blood vessels helps in maintaining a continuous flow of blood. In this type of capillaries exchange of material between blood and body cells also takes place.
This type of circulatory system is present in Annelids, molluscs and chordates.
So the correct option is insects(B).

Note:-
-In phylum Porifera, Coelenterata, Platyhelminthes, Ctenophora, Aschelminthes circulatory system is absent.
- In Annelida the closed circulatory system is percent and the respiratory pigment is haemoglobin or erythromycin but in leeches an open circulatory system is present.
- In Mollusca open circulatory systems are present and respiratory pigment is haemocyanin.
- In hemichordates a closed circulatory system is present.