Question

7. Which of the following animals do not
have closed circulation?
a. Earthworm.
b. Rabbit
c. Butterfly
d. Shark​

Answer 1

Answer:

butterfly is the answer

Answer 2

Answer:

Rabbits and sharks are chordates and have closed blood circulatory systems.
Earthworm belongs to the phylum Annelida and has a closed blood circulatory system.
Butterflies are insects and they do not have a closed blood circulatory system.

Explanation:

In the animal kingdom, circulation of body fluids occurs mainly in two ways or rather we can say circulatory pathways:

1. Open circulatory system
2. Closed circulatory system

What is an open circulatory system?

• In an open circulatory system, the blood does not flow through any tubes (arteries, veins or capillaries) and the organs and tissues of the organism are constantly bathed in the blood.
• The blood does flow openly in the body cavity and such a body cavity is known as haemocoel.
• This is a primitive way of circulatory pathway.

E.g., most insects bear this type of circulatory system.

What is a closed circulatory system?

• This is an evolutionary advanced circulatory pathway.
• In this type, the blood flows through dedicated tubes (arteries, veins, and capillaries) and not openly into the body cavity.
• The arteries bifurcate into numerous tiny, thin capillaries through which vital nutrients and gases diffuse in and out of the blood into the tissues and to and fro.

E.g., members of Chordates, phylum Annelid, etc.

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