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Which of the following have an open circulatory system? (i) Arthropoda                   (ii) Mollusca (iii) Annelida                       (iv) Cnidaria

Which of the following have an open circulatory system? (i) Arthropoda                   (ii) Mollusca (iii) Annelida                       (iv) Cnidaria Correct Answer <p> (i) and (ii) </p>

Key Points 

The correct option is (i) and (ii) 

  • The blood vascular or circulatory system can be of two types 1. Open circulatory system 2. Closed circulatory system
  1. Open circulatory system: Open circulatory system is present in arthropods and molluscs in which blood pumped by the heart passes through large vessels into open spaces or body cavities called sinuses. Here the blood is not enclosed by any blood vessel or capillary.
  2. Closed circulatory system: Annelids and chordates have a closed circulatory system in which the blood pumped by the heart is always circulated through a closed network of blood vessels. This pattern is considered to be more advantageous as the flow of fluid can be more precisely regulated.

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Diagram showing Open vascular system of cockroach

Related Questions

Consider the following statements about the Open and Closed Blood Circulatory System:   A) Open blood circulatory system does not contain special blood vessels to carry oxygenated and deoxygenated blood, while in the closed blood circulatory system blood vessels are present. B) Oxygenated and Deoxygenated blood gets mixed in the closed blood circulatory system, while oxygenated and deoxygenated blood does not get mixed in the open blood circulatory system. Choose the correct statement.
Which of the following statements regarding Phylum Arthropoda is/are NOT  correct? (i) Phylum Arthropoda is the largest phylum in the animal kingdom. (ii) All have an open system (iii) Octopus (Devilfish), sepia (cuttlefish) are examples of Arthropoda.
With reference to the Human Circulatory System consider the following statements. William Harvey was the first person to  describe blood circulation in the body. In closed circulatory systems there is no distinction between blood and interstitial fluid In open circulatory systems blood vessels are found throughout the body and form the plumbing circuit of the body. Which of the statements given above is/are NOT correct?
‘Grand Slam’ refers to winning certain major tennis tournaments in a single calendar year. The name of the tournaments are A. Australian Open, French Open and US Open B. Australian Open, French Open, Wimbledon and US Open.  C. French Open, US Open and Wimbledon D. French Open, US Open, Wimbledon and Olympic
S1: There is no transportation system in any city that can compare in efficiency with the circulatory system of the body.
P: The larger one goes from the heart to the various other parts of the body.
Q: If you imagine two systems of pipes, one large and one small, both meeting at a central pumping station, you'll have an idea of the circulatory system.
R: These pipes are called arteries, veins and capillaries.
S: The smaller system of pipes goes from the heart to the lungs and back.
S6: Arteries are blood vessels in which blood is going away from the heart.

The Proper sequence should be:
Which one of the following is the connecting link between Annelida and Mollusca?
Connecting link between annelida and arthropoda is
নিচের কোনটি Mollusca পর্বের প্রাণী? (Which of the following belongs to phylum Mollusca?)
নিচের কোনটি Arthropoda পর্বের বৈশিষ্ট্য? (Which one of the following is a characteristic of phylum Arthropoda?)
A container of 425 liters was filled with chemicals through two pipes. The first pipe was kept open for 5 hours more than the second pipe. If the first pipe remains open for as long as the second pipe remains open, and the second pipe remains open for as long as the first pipe remains open, then the quantity of chemical filled by the first pipe was half the quantity of chemical filled by the second pipe. If both the pipes are opened simultaneously, the tank will be filled in 17 hours. For how long was the second pipe open?