NEET Biology Body Fluids and Circulation MCQs Set 25

Biology Objective Questions and Answers: Body Fluids and Circulation

Access targeted multiple-choice questions for Body Fluids and Circulation designed to align with the latest NEET academic syllabus for NEET Biology. These objective practice sets help students evaluate their conceptual understanding and improve exam readiness.

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Multiple Choice Questions

Question 1: The largest RBC is found in:
(a) Frog
(b) Amphiuma
(c) Elephant
(d) Rabbit
Show Answer & Explanation

Answer: (b) Amphiuma

Explanation:
1. Amphiuma, an amphibian, has the largest red blood cells (about 70 micrometre), and elephant RBCs are the largest among mammals.

Teacher's Note:
1. Revise this point from the NCERT chapter and link it with the related terms.

Question 2: Which one is the correct match? (A) Neutrophils - 2-3 lobed nucleus (B) Monocyte - phagocytosis (C) Basophils - eosinophilia during allergy (D) Erythrocyte - 20 gm Hb (E) Platelets - repairing of mesothelium (F) Acidophils - 2-3% DLC. Choose the option with correct matches only.
(a) B, E
(b) A, E
(c) B, F
(d) A, F
Show Answer & Explanation

Answer: (c) B, F

Explanation:
1. Monocytes are phagocytic, and acidophils (eosinophils) form 2-3% of the differential leucocyte count.

Teacher's Note:
1. Neutrophils have 3-5 lobes, eosinophils are linked with allergy, and 100 ml of blood has 12-16 g Hb.

Question 3: The total leucocyte count and platelet count respectively in a normal human per mm3 of blood are:
(a) 7000, 45 lakh
(b) 8000, 1 lakh
(c) 7000, 2.5 lakh
(d) 20,000, 3.5 lakh
Show Answer & Explanation

Answer: (c) 7000, 2.5 lakh

Explanation:
1. Normal TLC is 6000-8000 per mm3 and platelets are 1.5-3.5 lakh per mm3.

Teacher's Note:
1. Revise this point from the NCERT chapter and link it with the related terms.

Question 4: Hb F and Hb A generally consist of:
(a) 2α + 2γ and 2α + 2&delta
(b) 2α + 2β and 2α + 2&gamma
(c) 2β + 2α and 2α + 2&delta
(d) 2α + 2γ and 2α + 2β
Show Answer & Explanation

Answer: (d) 2α + 2γ and 2α + 2β

Explanation:
1. Foetal haemoglobin (Hb F) has two alpha and two gamma chains, and adult haemoglobin (Hb A) has two alpha and two beta chains.

Teacher's Note:
1. Revise this point from the NCERT chapter and link it with the related terms.

Question 5: The most abundant protein of blood plasma is:
(a) Prothrombin
(b) Albumin
(c) Fibrinogen
(d) Globulin
Show Answer & Explanation

Answer: (b) Albumin

Explanation:
1. Albumin forms about 60% of plasma proteins and maintains the osmotic balance of blood.

Teacher's Note:
1. Revise this point from the NCERT chapter and link it with the related terms.

Question 6: Ions that play a very important role in blood clotting are:
(a) Cl-
(b) Mg++
(c) Na+
(d) Ca++
Show Answer & Explanation

Answer: (d) Ca++

Explanation:
1. Calcium ions are needed to activate thromboplastin and to convert prothrombin into thrombin.

Teacher's Note:
1. Revise this point from the NCERT chapter and link it with the related terms.

Question 7: Plasma forms what percentage of blood?
(a) 55%
(b) 65%
(c) 45%
(d) 90%
Show Answer & Explanation

Answer: (a) 55%

Explanation:
1. Plasma forms about 55% of blood, and the formed elements (corpuscles) make up the remaining 45%.

Teacher's Note:
1. Revise this point from the NCERT chapter and link it with the related terms.

Question 8: The most abundant nucleated cells in human blood are:
(a) RBC
(b) Neutrophils
(c) Platelets
(d) Lymphocytes
Show Answer & Explanation

Answer: (b) Neutrophils

Explanation:
1. Mature human RBCs have no nucleus, and platelets are cell fragments.

Teacher's Note:
1. Of the nucleated WBCs, neutrophils (60-65%) are the most abundant.

Question 9: Normal blood platelet count is:
(a) 1,50,000-3,50,000 per cm3
(b) 6000-8000 per mm3
(c) 5-5.5 million per cm3
(d) 1,50,000-3,50,000 per mm3
Show Answer & Explanation

Answer: (d) 1,50,000-3,50,000 per mm3

Explanation:
1. Normal platelet count is 1.5 to 3.5 lakh per cubic millimetre of blood.

Teacher's Note:
1. 6000-8000 per mm3 is the leucocyte count.

Question 10: A reduction in which of the following blood cells can lead to clotting disorders?
(a) Basophils
(b) Platelets
(c) RBC
(d) Lymphocytes
Show Answer & Explanation

Answer: (b) Platelets

Explanation:
1. Platelets release the factors that start clotting, so a fall in their number causes clotting disorders.

Teacher's Note:
1. Revise this point from the NCERT chapter and link it with the related terms.

Question 11: The most abundant phagocytic cell of blood is:
(a) Lymphocyte
(b) Neutrophil
(c) Acidophil
(d) Basophil
Show Answer & Explanation

Answer: (b) Neutrophil

Explanation:
1. Neutrophils are the most numerous WBCs and are the main phagocytic cells of blood.

Teacher's Note:
1. Revise this point from the NCERT chapter and link it with the related terms.

Question 12: Find the correct relation:
(a) Blood = Plasma - Corpuscles
(b) Blood = Plasma + Blood corpuscles
(c) Plasma + fibrinogen and large protein = Serum
(d) PCV = RBC - (WBC + Platelets)
Show Answer & Explanation

Answer: (b) Blood = Plasma + Blood corpuscles

Explanation:
1. Blood is a fluid connective tissue made of plasma and the blood corpuscles.

Teacher's Note:
1. Serum is plasma without clotting factors.

Question 13: Which statement is not correct for leucocytes?
(a) Total leucocyte count in an adult person is 6000-8000 per mm3 of blood
(b) An increase in TLC is called leucocytopenia
(c) Acidophil has a bilobed nucleus
(d) An S-shaped nucleus is present in basophil
Show Answer & Explanation

Answer: (b) An increase in TLC is called leucocytopenia

Explanation:
1. An increase in the leucocyte count is leucocytosis, and a decrease is leucocytopenia.

Teacher's Note:
1. The other statements are correct.

Question 14: Erythroblastosis foetalis occurs when:
(a) Mother Rh+ve and foetus Rh+ve
(b) Mother Rh-ve and foetus Rh-ve
(c) Mother Rh+ve and foetus Rh-ve
(d) Mother Rh-ve and foetus Rh+ve
Show Answer & Explanation

Answer: (d) Mother Rh-ve and foetus Rh+ve

Explanation:
1. An Rh-negative mother carrying an Rh-positive foetus makes anti-Rh antibodies, which harm the RBCs of the next Rh-positive foetus.

Teacher's Note:
1. Revise this point from the NCERT chapter and link it with the related terms.

Question 15: In the clotting mechanism, prothrombin is converted into (a) and fibrinogen is converted into (b). Identify (a) and (b).
(a) a Thrombin, b Fibrinolysin
(b) a Thrombin, b Fibrin
(c) a Thrombokinase, b Thrombin
(d) a Fibrin, b Thrombin
Show Answer & Explanation

Answer: (b) a Thrombin, b Fibrin

Explanation:
1. Thrombokinase converts prothrombin into thrombin, and thrombin then changes fibrinogen into insoluble fibrin threads.

Teacher's Note:
1. Revise this point from the NCERT chapter and link it with the related terms.

Question 16: Match: A Erythrocytes, B Eosinophils, C Neutrophils, D Lymphocytes, E Basophils with (i) most abundant WBCs and main phagocytic cell (ii) least abundant WBCs (iii) resist infections and associated with allergic reactions (iv) contain haemoglobin and transport oxygen (v) specialised antibody producing WBCs.
(a) A-iv, B-iii, C-i, D-v, E-ii
(b) A-i, B-ii, C-iii, D-iv, E-v
(c) A-ii, B-iii, C-i, D-v, E-iv
(d) A-iv, B-i, C-ii, D-iii, E-v
Show Answer & Explanation

Answer: (a) A-iv, B-iii, C-i, D-v, E-ii

Explanation:
1. Erythrocytes carry oxygen with Hb, eosinophils resist infection and allergy, neutrophils are the most abundant phagocytes, lymphocytes make antibodies, and basophils are the least abundant.

Teacher's Note:
1. Revise this point from the NCERT chapter and link it with the related terms.

Question 17: When there is a sudden loss of blood from the body, the organ which supplies blood is:
(a) Heart
(b) Lung
(c) Spleen
(d) Liver
Show Answer & Explanation

Answer: (c) Spleen

Explanation:
1. The spleen acts as a blood reservoir and releases stored blood and RBCs when there is sudden blood loss.

Teacher's Note:
1. Revise this point from the NCERT chapter and link it with the related terms.

Question 18: Which point is incorrect regarding the first heart sound?
(a) It is produced at the beginning of ventricular systole
(b) It is associated with the closure of the tricuspid and bicuspid valves
(c) It is called LUBB
(d) It is a high pitch sound for a short period
Show Answer & Explanation

Answer: (d) It is a high pitch sound for a short period

Explanation:
1. The first sound (LUBB) is a low pitched, longer sound, and the second sound (DUP) is high pitched and short.

Teacher's Note:
1. The other points are correct.

Question 19: Statements: (A) Arteries always carry blood away from the heart. (B) Valves are absent in the arteries. (C) Arteries always carry deoxygenated blood. (D) The lumen of an artery is wide. How many statements are wrong?
(a) Three
(b) Four
(c) One
(d) Two
Show Answer & Explanation

Answer: (d) Two

Explanation:
1. The pulmonary artery carries deoxygenated blood, so C is wrong.
2. Arteries have a narrow lumen with thick walls, so D is wrong.

Teacher's Note:
1. So two statements are wrong.

Question 20: Besides a four chambered heart, a few groups of animals also possess a four chambered stomach. Which of the following animals come under this category?
(a) Cow
(b) Goat
(c) Sheep
(d) All of the above
Show Answer & Explanation

Answer: (d) All of the above

Explanation:
1. Ruminants such as cow, goat and sheep have a four chambered stomach (rumen, reticulum, omasum, abomasum).

Teacher's Note:
1. Revise this point from the NCERT chapter and link it with the related terms.

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Practice MCQs for NEET Biology Body Fluids and Circulation

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FAQs

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