NCERT Class 11 Science — Chapter 5: Body Fluids and Circulation

Which blood group can receive blood from all ABO groups?

Which mineral ion plays a critical role in the mechanism of blood clotting?

Which of the following white blood cells are the main phagocytic cells responsible for engulfing pathogens?

Which human cells are characteristically enucleated and biconcave in shape?

Which plasma protein is essential for the coagulation of blood?

Who among the following can donate blood to individuals of any ABO group?

Which plasma protein is primarily responsible for maintaining the osmotic balance of blood?

Which valves guard the openings between the right atrium and right ventricle, and the left atrium and left ventricle?

Which blood group is designated as the universal donor?

The innermost layer of a blood vessel, the tunica intima, is composed of:

Which leukocyte constitutes the highest percentage of the total white blood cell count?

Which structural feature characterises mature mammalian RBCs?

Assertion (A): Red blood cells are the primary medium for the transport of oxygen in the human body. Reason (R): Haemoglobin inside RBCs reversibly binds with oxygen to form oxyhaemoglobin.

Consider the following statements regarding plasma: 1. It constitutes nearly 55% of blood. 2. Water forms about 90-92% of plasma. 3. Plasma proteins contribute around 6-8%. 4. Serum is plasma with clotting factors. Which of the statements given above are correct?

Consider the following statements about the Rh factor: 1. Rh negative individuals never form anti-Rh antibodies. 2. About 80% of humans are Rh positive. 3. Rh matching is not required before transfusion. Which of the above are correct?

Assertion (A): The spleen is often referred to as the "graveyard of RBCs". Reason (R): The spleen acts as a filter of the blood, trapping blood-borne microorganisms.

Consider the following statements about the ABO blood grouping: 1. It is based on surface antigens A and B on white blood cells. 2. Plasma contains natural antibodies against absent antigens. 3. Blood transfusion requires matching of blood groups. Which of the statements given above are correct?

Assertion (A): The human heart is situated in the thoracic cavity between the lungs. Reason (R): The heart is protected by a double-walled membranous bag called the pericardium.

The condition of severe anaemia/jaundice in a newborn due to Rh incompatibility is called:

Which of the following correctly represents pulmonary circulation?

Blood plasma from which the clotting factors have been removed is termed:

Which type of white blood cell is the least abundant in normal human blood?

The average lifespan of a human red blood cell is approximately:

Which blood group is considered the universal recipient?

A reduction in the number of which blood cells can lead to clotting disorders and excessive bleeding?

The condition arising from Rh incompatibility between an Rh-negative mother and an Rh-positive foetus is known as:

Unlike most reptiles, crocodiles possess a heart with:

The valve located between the left atrium and the left ventricle is the:

In a resting human adult, the duration of a single cardiac cycle is approximately:

The tunica media (muscle layer) is comparatively thinner in:

Where are human Red Blood Cells (RBCs) primarily formed in adults?

Which animals generally show an open circulatory system?

Hypertension is generally diagnosed when repeated blood pressure readings are at or above:

Basophils are involved in inflammatory reactions and secrete: