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Body Fluids and Circulation Practice Questions

Class 11 · Biology · 2246 free MCQs with instant results and detailed explanations.

2246
Total
699
Easy
1105
Medium
442
Hard

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Topics in Body Fluids and Circulation

ECG 437
Heart 459
Circulatory Pathways 473
Blood 460
Blood Groups 417

Sample Questions from Body Fluids and Circulation

Here are 10 sample questions. Start a quiz to get randomized questions with scoring.

Q1
Easy
What is the primary function of hemoglobin in red blood cells?
A. Transport oxygen
B. Fight infections
C. Clot blood
D. Regulate body temperature
Show Answer & Explanation
Correct Answer: A
Hemoglobin binds oxygen in the lungs and transports it to cells throughout the body.
Q2
Easy
Which component of blood is primarily responsible for clotting?
A. Red blood cells
B. White blood cells
C. Platelets
D. Plasma
Show Answer & Explanation
Correct Answer: C
Platelets are cell fragments that play a crucial role in the clotting process of blood.
Q3
Easy
What is the average pH range of human blood?
A. 6.0 - 6.5
B. 7.35 - 7.45
C. 8.0 - 8.5
D. 7.0 - 7.5
Show Answer & Explanation
Correct Answer: B
Human blood typically has a pH range between 7.35 and 7.45, which is crucial for physiological functions.
Q4
Medium
What is the primary function of hemoglobin in red blood cells?
A. Transport of oxygen
B. Clotting of blood
C. Defense against pathogens
D. Regulation of blood pressure
Show Answer & Explanation
Correct Answer: A
Hemoglobin binds to oxygen in the lungs and carries it to tissues, making it essential for oxygen transport.
Q5
Medium
Which blood component is primarily responsible for the immune response?
A. Red blood cells
B. Platelets
C. White blood cells
D. Plasma
Show Answer & Explanation
Correct Answer: C
White blood cells are crucial for the immune response, as they help defend against infections and diseases.
Q6
Medium
What percentage of blood volume is typically composed of red blood cells in a healthy adult?
A. 30-35%
B. 40-45%
C. 50-55%
D. 60-65%
Show Answer & Explanation
Correct Answer: B
In a healthy adult, red blood cells generally make up about 40-45% of total blood volume.
Q7
Medium
Which of the following statements about plasma is true?
A. It contains no proteins.
B. It is the least abundant component of blood.
C. It helps maintain osmotic pressure.
D. It is produced in the kidneys.
Show Answer & Explanation
Correct Answer: C
Plasma contains proteins that help maintain osmotic pressure, among other functions.
Q8
Hard
What is the primary function of erythropoietin in the body?
A. Stimulates red blood cell production
B. Promotes platelet formation
C. Regulates blood sugar levels
D. Enhances white blood cell activity
Show Answer & Explanation
Correct Answer: A
Erythropoietin is primarily responsible for stimulating the production of red blood cells in the bone marrow.
Q9
Hard
Which blood type is considered the universal donor?
A. AB+
B. O-
C. A+
D. B-
Show Answer & Explanation
Correct Answer: B
O- blood type can be given to any patient without risk of ABO incompatibility.
Q10
Hard
What is the normal pH range of human blood?
A. 6.8 - 7.2
B. 7.35 - 7.45
C. 7.0 - 8.0
D. 6.0 - 6.5
Show Answer & Explanation
Correct Answer: B
The normal pH of human blood is tightly regulated between 7.35 and 7.45, indicating a slightly alkaline environment.

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Body Fluids and Circulation — Class 11 Biology Practice Questions Online

This page contains 2246 practice MCQs for the chapter Body Fluids and Circulation in Class 11 Biology. The questions are organized by difficulty — 699 easy, 1105 medium, 442 hard — so you can choose the right level for your preparation.

Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 5 topics, giving you comprehensive coverage of the entire chapter.