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NEET · Biology · Class 11

Body Fluids and Circulation — NEET Biology MCQs

30 questions written by hand against the NCERT chapter. Every wrong option is explained, not just the right one.

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Sample questions from this chapter

A plasma sample clots after fibrinogen is activated, whereas serum from the same person does not. What distinguishes serum?
  1. It lacks water
  2. It is plasma after removal or consumption of clotting proteins ✓
  3. It contains erythrocytes but no ions
  4. It has more fibrinogen than plasma
Answer: B. Serum is the fluid remaining after blood clots, lacking fibrinogen and several clotting factors. Plasma is collected before coagulation.
Why not A: Serum remains mostly water with dissolved solutes.
Why not C: Both plasma and serum are cell-free liquid fractions after proper separation.
Why not D: Fibrinogen is consumed during clotting, so serum contains less, not more.
A patient with severe liver disease develops oedema and has very low plasma albumin. Which force has been reduced?
  1. Plasma colloid osmotic pressure drawing water into capillaries ✓
  2. Arterial pressure ejecting blood from ventricles
  3. Platelet adhesion at wounds
  4. Lymphatic smooth-muscle tone only
Answer: A. Albumin retains water within plasma through oncotic pressure. When it falls, filtration exceeds return and tissue fluid accumulates.
Why not B: Arterial hydrostatic pressure can promote filtration but is not supplied by albumin.
Why not C: Platelets mediate haemostasis; albumin chiefly influences fluid distribution.
Why not D: Lymph drainage matters, but hypoalbuminaemia directly lowers capillary reabsorptive oncotic force.
An Rh-negative mother carries an Rh-positive fetus for the first time. Why is a later Rh-positive pregnancy at greater risk without prophylaxis?
  1. Fetal anti-Rh antibodies cross into the mother
  2. ABO antigens disappear after birth
  3. Maternal erythrocytes become Rh positive
  4. Exposure can sensitise the mother to produce anti-Rh IgG that crosses the placenta later ✓
Answer: D. Fetomaternal blood mixing can prime an Rh-negative mother. In a subsequent pregnancy, maternal IgG crosses the placenta and haemolyses Rh-positive fetal cells.
Why not A: The immune response of concern is maternal antibody against fetal erythrocytes.
Why not B: ABO antigen persistence does not explain Rh sensitisation.
Why not C: Antibody production does not change the mother's inherited red-cell antigen.

These are 3 of the 30 questions in the test. Take the full chapter test →

Read the chapter first

Every NCERT question in this chapter is solved, free: NCERT solutions — Body Fluids and Circulation →

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Questions

How many NEET questions are there on Body Fluids and Circulation?

This chapter test has 30 questions — 10 easy, 14 medium and 6 hard — all written against the NCERT Class 11 chapter.

Is this NEET Biology chapter test free?

Yes. Every chapter test is free with no login. The only paid thing on the site is the full-length 90-question Biology mock and its all-India rank.

Do the questions explain the wrong options?

Yes — every distractor carries its own explanation naming the specific misconception that makes a student pick it. That is the part most question banks skip, and it is the part that changes your next attempt.