- 1(current)
Q. No.Assertion (A): The walls of ventricles are much thicker than that of the atria.
Reason (R): Ventricles pump blood to different organs and the pressure with which the blood flows through them is much more than the auricles.
In the light of above statements, choose the correct option.
1. Both (A) and (R) are true and (R) is the correct explanation of (A)
2. Both (A) and (R) are true but (R) is not the correct explanation of (A)
3. (A) is true but (R) is false
4. Both (A) and (R) are false
Reason (R): Ventricles pump blood to different organs and the pressure with which the blood flows through them is much more than the auricles.
In the light of above statements, choose the correct option.
1. Both (A) and (R) are true and (R) is the correct explanation of (A)
2. Both (A) and (R) are true but (R) is not the correct explanation of (A)
3. (A) is true but (R) is false
4. Both (A) and (R) are false
Subtopic: Â Human Heart: Double Circulation |
 84%
From NCERT
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Read the given statements carefully.
Select the correct option.
1. Only statements (a) and (b) are correct.
2. Only statements (a) and (c) are correct.
3. Only statement (c) is correct.
4. Only statements (b) and (c) are incorrect.
| (a) | Congestion of lungs is one of the main symptoms of heart failure. |
| (b) | Each vein has an inner lining of cuboidal endothelium, called tunica intima. |
| (c) | The cardiac output of an athlete will be much lower than that of an ordinary man. |
1. Only statements (a) and (b) are correct.
2. Only statements (a) and (c) are correct.
3. Only statement (c) is correct.
4. Only statements (b) and (c) are incorrect.
Subtopic: Â Human Heart: Double Circulation |Â Human Heart: Cardiac Cycle |
 58%
From NCERT
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Read the following statements
a. Adult human RBCs are enucleated and biconcave in shape
b. The opening between the right atrium and the right ventricle is guarded by mitral valve
c. The duration of a cardiac cycle is 0.8 seconds under normal physiological conditions in an adult human
d. The hepatic portal vein carries blood from intestine into liver before it is delivered to the heart
How many of the given statements are incorrect?
1. Four
2. Two
3. One
4. Three
a. Adult human RBCs are enucleated and biconcave in shape
b. The opening between the right atrium and the right ventricle is guarded by mitral valve
c. The duration of a cardiac cycle is 0.8 seconds under normal physiological conditions in an adult human
d. The hepatic portal vein carries blood from intestine into liver before it is delivered to the heart
How many of the given statements are incorrect?
1. Four
2. Two
3. One
4. Three
Subtopic: Â Human Heart: Double Circulation |
 57%
From NCERT
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Assertion (A): Birds and Mammals have double circulation.
Reason (R): Two separate circulatory pathways are present in birds and mammals where the mixing of oxygenated and deoxygenated blood occurs.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Reason (R): Two separate circulatory pathways are present in birds and mammals where the mixing of oxygenated and deoxygenated blood occurs.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Subtopic: Â Human Heart: Double Circulation |
 85%
From NCERT
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Assertion (A): The flow of blood in closed circulatory system is slower than in open circuatory system.
Reason (R): Blood pressure is lower in closed circulatory system.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Reason (R): Blood pressure is lower in closed circulatory system.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Â Human Heart: Double Circulation |
 68%
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Assertion (A): The mixing of oxygenated and deoxygenated blood does not occur in mammalian heart.
Reason (R): Within the heart blood flows in one direction only.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Reason (R): Within the heart blood flows in one direction only.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Â Human Heart: Double Circulation |
 50%
From NCERT
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Assertion (A): All vertebrate have hepatic portal system.
Reason (R) All animals have hepatic portal system.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Reason (R) All animals have hepatic portal system.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Â Human Heart: Double Circulation |
 53%
From NCERT
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Assertion (A): If an individual stands immobile for a long time, it leads to accumulation of fluids in the leg tissues and swelling in feet.
Reason (R): Contraction of muscles compresses the veins to move the blood inside them.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Reason (R): Contraction of muscles compresses the veins to move the blood inside them.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic: Â Blood: General Description & RBC: Part 1 |Â Blood: General Description & RBC: Part 2 |Â Human Heart: Double Circulation |
 65%
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One of the main advantages of a closed over an open circulatory system is:
1. The use of a heart to create pressure gradients necessary for blood flow
2. The ability to direct the flow of blood to certain tissues
3. The ability of respiratory pigment to transport O2
4. The ability to return blood to the heart
1. The use of a heart to create pressure gradients necessary for blood flow
2. The ability to direct the flow of blood to certain tissues
3. The ability of respiratory pigment to transport O2
4. The ability to return blood to the heart
Subtopic: Â Human Heart: Double Circulation |
From NCERT
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If a molecule of CO2 released into the blood of a human foetus is exhaled through the mouth of the mother, it will not travel through the:
1. Right atrium of mother
2. Right atrium of foetus
3. Left ventricle of mother
4. Left ventricle of foetus
1. Right atrium of mother
2. Right atrium of foetus
3. Left ventricle of mother
4. Left ventricle of foetus
Subtopic: Â Human Heart: Double Circulation |
 51%
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