Selina Textbook Solutions: Circulatory System | Biology Class 6 ICSE PDF Download

 Page 1


Multiple Choice Questions: 
 
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. 
(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. 
(c) Nucleus is absent in 
(i) RBCs 
(ii) VBCs 
(iii) All blood cells 
(iv) Liver cells. 
(d) The only artery which carries deoxygenated blood is called, 
(i) Hepatic artery 
(ii) Pulmonary artery 
(iii) Aorta 
(iv) Renal artery 
(e) Sphygmomanometer ni’sures 
(i) Pulse rate 
(ii) Heart beat 
(iii) Blood pressure 
(iv) Brain activity 
(f) Pulmonary vein carries 
(i) Oxygenated blood 
(ii) Deoxygenated blood 
(iii) Glucose-rich blood 
(iv) C02 laden blood 
(g) The blood tastes saltish due to the dissolved: 
(i) Sodium chloride 
(ii) Potassium chloride 
Page 2


Multiple Choice Questions: 
 
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. 
(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. 
(c) Nucleus is absent in 
(i) RBCs 
(ii) VBCs 
(iii) All blood cells 
(iv) Liver cells. 
(d) The only artery which carries deoxygenated blood is called, 
(i) Hepatic artery 
(ii) Pulmonary artery 
(iii) Aorta 
(iv) Renal artery 
(e) Sphygmomanometer ni’sures 
(i) Pulse rate 
(ii) Heart beat 
(iii) Blood pressure 
(iv) Brain activity 
(f) Pulmonary vein carries 
(i) Oxygenated blood 
(ii) Deoxygenated blood 
(iii) Glucose-rich blood 
(iv) C02 laden blood 
(g) The blood tastes saltish due to the dissolved: 
(i) Sodium chloride 
(ii) Potassium chloride 
(iii) Ammonium nitrate 
(iv) Sodium nitrate 
Short Answer Questions: 
1. Differentiate between the following pair of terms: 
Question 1(a) 
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. 
Page 3


Multiple Choice Questions: 
 
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. 
(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. 
(c) Nucleus is absent in 
(i) RBCs 
(ii) VBCs 
(iii) All blood cells 
(iv) Liver cells. 
(d) The only artery which carries deoxygenated blood is called, 
(i) Hepatic artery 
(ii) Pulmonary artery 
(iii) Aorta 
(iv) Renal artery 
(e) Sphygmomanometer ni’sures 
(i) Pulse rate 
(ii) Heart beat 
(iii) Blood pressure 
(iv) Brain activity 
(f) Pulmonary vein carries 
(i) Oxygenated blood 
(ii) Deoxygenated blood 
(iii) Glucose-rich blood 
(iv) C02 laden blood 
(g) The blood tastes saltish due to the dissolved: 
(i) Sodium chloride 
(ii) Potassium chloride 
(iii) Ammonium nitrate 
(iv) Sodium nitrate 
Short Answer Questions: 
1. Differentiate between the following pair of terms: 
Question 1(a) 
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. They help in transport of respiratory gases. 
WBC 
1. They have a large characteristic nucleus. 
2. They 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: 
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: 
1. Plasma: The plasma is a light-yellow coloured, alkaline liquid which mainly 
consists of: 
? Water- 90-92% 
Page 4


Multiple Choice Questions: 
 
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. 
(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. 
(c) Nucleus is absent in 
(i) RBCs 
(ii) VBCs 
(iii) All blood cells 
(iv) Liver cells. 
(d) The only artery which carries deoxygenated blood is called, 
(i) Hepatic artery 
(ii) Pulmonary artery 
(iii) Aorta 
(iv) Renal artery 
(e) Sphygmomanometer ni’sures 
(i) Pulse rate 
(ii) Heart beat 
(iii) Blood pressure 
(iv) Brain activity 
(f) Pulmonary vein carries 
(i) Oxygenated blood 
(ii) Deoxygenated blood 
(iii) Glucose-rich blood 
(iv) C02 laden blood 
(g) The blood tastes saltish due to the dissolved: 
(i) Sodium chloride 
(ii) Potassium chloride 
(iii) Ammonium nitrate 
(iv) Sodium nitrate 
Short Answer Questions: 
1. Differentiate between the following pair of terms: 
Question 1(a) 
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. They help in transport of respiratory gases. 
WBC 
1. They have a large characteristic nucleus. 
2. They 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: 
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: 
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 haemoglobin. 
2. The two lower chambers of the heart are called ventricles. 
3. The blood plasma contains a dissolved substance such as 
nutrient, proteins, waste products and harmones. 
4. 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 sphygmomanometer. 
6. 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 left ventricle of the heart. 
8. 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 pulmonary artery. 
10. 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 
Page 5


Multiple Choice Questions: 
 
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. 
(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. 
(c) Nucleus is absent in 
(i) RBCs 
(ii) VBCs 
(iii) All blood cells 
(iv) Liver cells. 
(d) The only artery which carries deoxygenated blood is called, 
(i) Hepatic artery 
(ii) Pulmonary artery 
(iii) Aorta 
(iv) Renal artery 
(e) Sphygmomanometer ni’sures 
(i) Pulse rate 
(ii) Heart beat 
(iii) Blood pressure 
(iv) Brain activity 
(f) Pulmonary vein carries 
(i) Oxygenated blood 
(ii) Deoxygenated blood 
(iii) Glucose-rich blood 
(iv) C02 laden blood 
(g) The blood tastes saltish due to the dissolved: 
(i) Sodium chloride 
(ii) Potassium chloride 
(iii) Ammonium nitrate 
(iv) Sodium nitrate 
Short Answer Questions: 
1. Differentiate between the following pair of terms: 
Question 1(a) 
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. They help in transport of respiratory gases. 
WBC 
1. They have a large characteristic nucleus. 
2. They 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: 
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: 
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 haemoglobin. 
2. The two lower chambers of the heart are called ventricles. 
3. The blood plasma contains a dissolved substance such as 
nutrient, proteins, waste products and harmones. 
4. 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 sphygmomanometer. 
6. 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 left ventricle of the heart. 
8. 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 pulmonary artery. 
10. 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. 
Long answer Questions 
Question 1. 
Name the three kinds of blood vessels found in human beings. With the help of suitable 
diagrams, differentiate between them. 
Answer: 
The three kind of blood vessels found in human beings are arteries, veins and 
capillaries. 
1. Arteries are the blood vessels that carry blood from the heart to the various parts 
of the body. 
2. Veins are the blood vessels that carry blood from the body parts to the heart. 
Capillaries: These are the terminal branches of an artery, which rejoin to form a vein. A 
capillary is a very narrow tube whose walls have a single layer of cells with no muscles. 
Although the wall of a capillary is very thin, yet an exchange of nutrients, waste products 
and gases take place between the b 1 ood and the body flu ids. 
 
Differences: 
Arteries 
1. Carry blood away from the heart. 
2. Have thick and more muscular walls. 
3. Carry oxygenated blood (except pulmonary artery which carries deoxygenated 
blood). 
4. The blood flows with j erks and under great force. 
Veins