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Circulatory System (Hard)

Description: Proteins
Number of Questions: 15
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Tags: Double circulatory system Earthworm Blood pressure open and closed circulatory system Circulatory System of Frog Circulatory System of Earthworm Circulatory System Human Circulatory System
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Which of the following organisms has a circulatory system without heart?

  1. Earthworm

  2. Cockroach

  3. Tapeworm

  4. Starfish

Show answer
Correct Option: D
Explanation:

Starfish has a circulatory system (though poorly developed) without heart. The haemal system in starfish performs the job of a circulatory system and the heart is not required.

In which organism is foramen of panizza (a hole in the heart between the two ventricles) present?

  1. Turtle

  2. Frog

  3. Crocodile

  4. Lizard

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Correct Option: C
Explanation:

Foramen of panizza is present in crocodiles. It is the hole in the heart between the two ventricles, which allows blood to move from one side of the heart to another.

Which blood vessel is involved in forward movement of blood in an earthworm?

  1. Longitudinal vessel

  2. Dorsal vessel

  3. Sub-neural vessel

  4. Lateral vessel

Show answer
Correct Option: B
Explanation:

The dorsal vessel is involved in forward movement of blood in an earthworm.

In which organism does pulmocutaneous circulation exist?

  1. Frog

  2. Lizard

  3. Fish

  4. Hookworm

Show answer
Correct Option: A
Explanation:

Pulmocutaneous circulation is a unique characteristic of amphibians, like frogs. 

In which organism is the pulmonary circuit of blood circulation absent?

  1. Frog

  2. Pigeon

  3. Fish

  4. Lizard

Show answer
Correct Option: C
Explanation:

Fishes has a single systemic circuit for blood. Pulmonary circuit is absent in fishes. The heart pumps the blood to the gills in order to get it reoxygenated.

Which blood pigment is found in earthworm's blood?

  1. Erythropoietin

  2. Erythrocyanin

  3. Erythrocruorin

  4. Hemocyanin

Show answer
Correct Option: C
Explanation:

Erythrocruorin is the blood pigment of an earthworm.

Which of the following molluscs possess closed circulatory system?

  1. Snails

  2. Squids

  3. Geoducks

  4. Cuttlefish

Show answer
Correct Option: B
Explanation:

Squids have closed circulatory system.

Which animal's heart continues to beat for hours even if the head is severed off?

  1. Turtle

  2. Cockroach

  3. Snake

  4. Pigeon

Show answer
Correct Option: A
Explanation:

A turtle's heart continues to beat for hours even if the head is severed off. This happens because the nerve cells within the heart continue firing for an extended period of time, promoting the process of beating.

In which of the following organisms does the open circulatory system function as a hydrostatic skeleton?

  1. Sponges

  2. Molluscs

  3. Echinodermates

  4. Earthworms

Show answer
Correct Option: B
Explanation:

In molluscs and freshly molted aquatic arthropods, the open circulatory system functions as a hydrostatic skeleton.

What does a systolic blood pressure reading of 140-159 mm Hg indicate?

  1. Prehypertension

  2. HBP stage 1

  3. HBP stage 2

  4. Hypertensive crisis

Show answer
Correct Option: B
Explanation:

A systolic blood pressure reading of 140-159 mm Hg indicates HBP stage 1. In this situation, the diastolic blood pressure may be 90-99 mm Hg.

Which of the following statements is not true?

  1. An organ's metabolic requirements are proportional to the number of blood vessels in it.

  2. Double circulation takes place through a two-chambered heart.

  3. Haemoglobin in a metamorphosed amphibian has a lower affinity for oxygen.

  4. Because of lack of an extensive system of blood vessels, open systems require less energy to build and maintain.

Show answer
Correct Option: B
Explanation:

This is incorrect. Fishes have a two-chambered heart and only single circulation is seen in them. Double circulation means that blood passes through the heart twice during each cycle of the circulatory process. In animals that have double circulation (blood circulation) systems, the heart has more than two chambers.

Match the following columns:

 
Organism Number of hearts
1. Earthworm a. 1
2. Ostrich b. 5
3. Gorilla c. 3
4. Hag fish d. 4
  1.  
    1. Earthworm d. 4
    2. Octopus a. 1
    3. Gorilla c. 3
    4. Hag fish b.5
  2.  
    1. Earthworm b.5
    2. Octopus c. 3
    3. Gorilla a. 1
    4. Hag fish d. 4
  3.  
    1. Earthworm d. 4
    2. Octopus c. 3
    3. Gorilla b. 5
    4. Hag fish a. 1
  4.  
    1. Earthworm c. 3
    2. Octopus a. 1
    3. Gorilla d. 4
    4. Hag fish b. 5
Show answer
Correct Option: B
Explanation:

This is the correct match. Earthworm has 5 hearts known as aortic arches. Octopus has 3 hearts; gorilla has 1 heart; and hag fish has 4 hearts.

In which of the following organisms are the largest known erythrocytes found?

  1. Cockroaches

  2. Amphibians

  3. Aves

  4. Arthropods

Show answer
Correct Option: B
Explanation:

Amphibians have the largest known erythrocytes. The greatest length is 40-60 qm in obligate neotanic salamanders.

Match the following columns:

 
Organisms Respiratory pigments
1. Annelids a. Hemoglobin
2. Sea squirts b. Hemocyanin
3. Molluscs c.Vanabin
4. Humans d. Chlorocruorin
  1.  
    1. Annelids b. Hemocyanin
    2. Sea squirts d. Chlorocruorin
    3. Molluscs c. Vanabin
    4. Humans a. Hemoglobin
  2.  
    1. Annelids d. Chlorocruorin
    2. Sea squirts c. Vanabin
    3. Molluscs b. Hemocyanin
    4. Humans a. Hemoglobin
  3.  
    1. Annelids b.Hemocyanin
    2. Sea squirts a. Hemoglobin
    3. Molluscs c. Vanabin
    4. humans d. Chlorocruorin
  4.  
    1. Annelids c. Vanabin
    2. Sea squirts b. Hemocyanin
    3. Molluscs d. Chlorocruorin
    4. Humans a. Hemoglobin
Show answer
Correct Option: B
Explanation:

This is the correct match. Chlorocruorin is an oxygen-binding pigment which is found in many annelids. It appears green when deoxygenated, and red when oxygenated. Vanabin is found in the blood of sea squirts. Hemocyanin is found in the blood of molluscs and hemoglobin is the respiratory pigment found in the blood of humans.

Match the following columns:

 
A B
1. Crocodile icefish a. Alary muscles
2. Salamander b. No erythrocyte
3. Cockroach c. Anucleated erythrocyte
4. Earthworm d. Aortic arches
  1.  
    1. Crocodile icefish c. Anucleated erythrocyte
    2. Salamander d. Aortic arches
    3. Cockroach b. No erythrocyte
    4. Earthworm a. Alary muscles
  2.  
    1. Crocodile icefish b. No erythrocyte
    2. Salamander c. Anucleated erythrocyte
    3. Cockroach a. Alary muscles
    4. Earthworm d. Aortic arches
  3.  
    1. Crocodile icefish d. Aortic arches
    2. Salamander a. Alary muscles
    3. Cockroach c. Anucleated erythrocyte
    4. Earthworm b. No erythrocyte
  4.  
    1. Crocodile icefish a. Anucleated erythrocyte
    2. Salamander b. No erythrocytte
    3. Cockroach d. Aortic arches
    4. Earthworm a. Alary muscles
Show answer
Correct Option: B
Explanation:

This is the correct match. Crocodile icefish do not have erythrocytes; salamanders are an exception to amphibians as they possess anucleated erythrocytes; cockroaches have alary muscles for breathing and an earthworm has aortic arches which act as a heart.

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