The Circulatory System ICSE Class-6th Concise Selina

The Circulatory System ICSE Class-6th Concise Selina Biology Solutions Chapter-6. We Provide Step by Step Answer of Objective, True False , Fill in the blanks , Match the following , Short/Long Answer Type of Exercise-6 The Circulatory System . Visit official Website  CISCE  for detail information about ICSE Board Class-6.

The Circulatory System ICSE Class-6th Concise Selina Biology Solutions Chapter-6


Review Questions 

Multiple Choice Question

1. Put a tick mark (✓) against the correct alternative in the following statements:

(a) Function of WBCs is to
(i) Transport oxygen
(ii) Help in clotting of blood
(iii) Provide immunity
(iv) Provide storage of food.

Answer    Option (iii) Provide immunity

Function of WBCs is to

(b) Blood Capillary is a
(i) Broad tube
(ii) Artery with thick wall
(iii) Vein with large lumen
(iv) Narrow tube made up of endothelium only.

Answer Option (iv) Narrow tube made up of endothelium only.

(c) Nucleus is absent in

(i) RBCs
(ii) VBCs
(iii) All blood cells
(iv) Liver cells.

Answer   Option (i) RBCs

(d) The only artery which carries deoxygenated blood is called,

(i) Hepatic artery
(ii) Pulmonary artery
(iii) Aorta
(iv) Renal artery

Answer Options  (ii) Pulmonary artery

(e) Sphygmomanometer Measures

(i) Pulse rate

(ii) Heart beat
(iii) Blood pressure
(iv) Brain activity

Answer  Options (iii) Blood pressure

(f) Pulmonary vein carries

(i) Oxygenated blood
(ii) Deoxygenated blood
(iii) Glucose-rich blood
(iv) C02 laden blood

Answer Options  (i) Oxygenated blood

(g) The blood tastes saltish due to the dissolved:

(i) Sodium chloride
(ii) Potassium chloride
(iii) Ammonium nitrate
(iv) Sodium nitrate

Answer  Options (i) Sodium chloride


Short Answer Questions:( Chapter-6 The Circulatory System ICSE Class-6th)

1. Differentiate between the following pair of terms:

Question 1(a)


Differentiate between Patelets and WBC

Answer:


Platelets

  1. These are colourless, oval or round, cytoplasmic fragments found floating in the blood.
  2. These play a major role in blood clotting.
  3. Their life span is 3-5 days and it is called thrombocytes.

WBC

  1. WBC are colourless and lack haemoglobin, larger in quantity, and have distinct oval and lobed nucleus.
  2. They prevent body from disease causing germs by providing immunity
  3. Their life span is short i.e. 5 to 20 days.

Question 1(b)


Pulmonary artery and pulmonary vein

Answer:


Pulmonary artery

  1. This involves circulation of blood from the heart to the lungs.
  2. It carries deoxygenated blood.

Pulmonary vein

  1. This involves circulation of blood to the heart from the lungs.
  2. It carries oxygenated blood.

Question 1(c)


Vena Cava and Aorta

Answer:


Vena Cava

  1. Vena Cava is a large vein.
  2. It carries deoxygenated blood from the upper and lower parts of the body i.e. head and shoulders.

Aorta

  1. Aorta is the large artery.
  2. It carries oxygenated blood to all parts of the body through its branches.

Question 1(d)


RBC and WBC

Answer:


RBC

  1. They do not have nucleus at maturity.
  2. They possess haemoglobin and are red.
  3. These helps in transport of respiratory gases.

WBC

  1. They have a large characteristic nucleus.
  2. These are colourless as they have no pigment.
  3. They help in defence mechanism.

Question 2.

Give any three differences between an artery and a vein:


Answer 4:


Following are the differences between the artery and a vein:

Artery
  1. Arteries carry blood from the heart to various body parts.
  2. These carry oxygenated blood (except the pulmonary artery).
  3. Blood flows with high speed and under high pressure.
Vein
  1. Veins carry blood from different body parts to the heart.
  2. These carry deoxygenatec blood (except the pulmonary vein).
  3. Blood flows with low speech and under low pressure.

Question 3.


Blood consists of two parts — a liquid part and a cellular part. Name these parts and briefly write about them.

Answer: 3

  1. Plasma: The plasma is a light-yellow coloured, alkaline liquid which mainly consists of:
    • Water- 90-92%
    • Proteins – 7-8%
    • Inorganic salts – 1%
    • Other substances – traces
  2. Cellular elements : These elements are of three categories:
    • Red blood cells (erythrocytes)
    • White blood cells (leukocytes)
    • Blood platelets (thrombocytes)

Question 4. 


What is the role of haemoglobin in the blood ?
Answer:
The haemoglobin is the respiratory pigment which is formed of the iron containing part known as haemin and protein part known as globin. It helps to transport respiratory gases (oxygen).

5. Fill in the blanks with suitable words given below:

1 The colour of a red blood cell is due to …………..

Ans :- The colour of a red blood cell is due to haemoglobin.

2 The two lower chambers of the heart are called………..

Ans :- The two lower chambers of the heart are called ventricles.

 

3 The blood plasma contains a dissolved substance such as nutrient, …… and ……

Ans :-  The blood plasma contains a dissolved substance such as nutrient, proteinswaste products and harmones.

 

4 The …………… artery takes the blood from the ventricles to the lungs.

 

Ans :-  The pulmonary artery takes the blood from the ventricles to the lungs.

 

5 The instrument used to find out the blood pressure is known as …………………..

Ans :-  The instrument used to find out the blood pressure is known as sphygmomanometer.

 

6 The blood loaded with carbon dioxide from the body comes into the ……..of the heart.

 

Ans :-  The blood loaded with carbon dioxide from the body comes into the right auricle of the heart.

 

7 The oxygen-rich blood from the lungs comes into the …………. of the heart.

 

Ans :- The oxygen-rich blood from the lungs comes into the left ventricle of the heart.

8 The oxygen-rich blood is pumped into different parts of the body through ……..

 

Ans :-  The oxygen-rich blood is pumped into different parts of the body through aorta.

9 The carbon dioxide loaded blood from right ventricle is pumped into the lungs through ………..

 

Ans :- The carbon dioxide loaded blood from right ventricle is pumped into the lungs through pulmonary artery.

10 The liquid part of coagulated blood is known as …………..

 

Ans :- The liquid part of coagulated blood is known as serum.

Question 6.


In which organ of our body does blood get oxygenated?

Answer:

Blood becomes oxygenated in the lungs. The oxygenated blood is returned to left verticles by the pulmonary vein.

Question 7.


Which side of the heart (left or right) contains oxygenated blood?
Answer:
The left side of the heart contains oxygenated blood.

Question 8.

Name the disease in which the number of platelets reduces to 25,000 – 30,000 per cubic mm of blood. State its major symptoms.

Answer:


Dengue fever is one such disease in which the number of platelets get reduced to as low as 25-30 thousands per cubic mm of blood. The major symptoms of dengue are high fever, rashes or red spots on body, nausea or vomiting, pain in abdomen, back, or back of the eyes and muscles.

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