Free Circulation MCQs with Answers

• A. Lacteals
• B. Lymph
• C. Lymphatic vessels
• D. Lymph nodes

Explanation: In the intestine, the centre of each villus has a special Lymph called lacteal therefore opt A is accurate.

• A. Dixon
• B. Mohl
• C. Sanger
• D. Munch

Explanation: Ernest Münch proposed the pressure flow theory in 1930.

• A. Tonoplast
• B. Plasma membrane
• C. Epidermis
• D. Both B and C

Explanation: The tonoplast is the membrane that surrounds the vacuole in plant cells and helps regulate its functions.

• A. One cell controls the activities of others
• B. One cell transfers its activities to others
• C. One cell destroys other cells
• D. One cell transfers germs to another cell

Explanation: In metastasis, cancer cells break away from the original (primary) tumor, travel through the blood or lymph system, and form a new tumor…

• A. Blood
• B. Lymph
• C. Semen
• D. Amniotic fluid

Explanation: Option B is correct since lymph nodes filter substances that travel through the lymphatic fluid.

• A. 1 molecule of oxygen
• B. 2 molecules of oxygen
• C. 3 molecules of oxygen
• D. 4 molecules of oxygen

Explanation: Each haemoglobin molecule contains 4 heme groups. Each group contains 1 iron atom that binds with 1 oxygen molecule.

• A. RBC
• B. Parabronchi
• C. Pleura
• D. None of these

Explanation: A is correct option because An enzyme present in red blood cells, carbonic anhydrase, aids in the conversion of carbon dioxide to carbonic…

• A. Companion cell
• B. Sieve tube members
• C. Vessels
• D. Parenchyma

Explanation: The phloem is composed of various specialized cells called sieve elements, phloem fibres, and phloem parenchyma cells.

• A. Citric acid
• B. Oxaloacetic acid
• C. Abscisic acid
• D. None of these options are correct

Explanation: Absisic acid is a stress hormone which is involved in opening and closing of the stoma.

• A. Respiratory exchange
• B. Diffusion
• C. Gaseous exchange
• D. Osmosis

Explanation: Gas exchange is the physical process by which gases move passively by diffusion across a surface.

• A. Carboxyhemoglobin
• B. Plasma proteins
• C. Bicarbonate ions
• D. Histamines

Explanation: Carboxyheamoglobin is formed when carbon dioxide combines with amino group.

• A. 2
• B. 3
• C. 4
• D. 5

Explanation: Every single heartbeat includes three major stages: atrial systole, ventricular systole, and complete cardiac diastole.

• A. Blood buffer
• B. Neutralization of H2CO3 by Na2CO3
• C. Absorption of leukocytes
• D. Non accumulation

Explanation: Option B is correct since blood does not become acidic due to the neutralization of H2CO3 by Na2CO3 (fact).

• A. Increase in size
• B. Increase in number
• C. Decrease in size
• D. Decrease in number

Explanation: The number of red blood cells (RBCs) at high altitude will increase. This is because at high altitudes, the concentration of oxygen in the…

• A. 15ml/100ml of blood
• B. 5l/5000ml of blood
• C. 20ml/100ml of blood
• D. 200ml/100ml of blood

Explanation: The normal human blood volume is typically about 5 liters or 5000ml. In this, the plasma volume is roughly 55% and the remaining 45% is…

• A. Neutrophil cells
• B. Basophil cells
• C. Mesophyll cells
• D. Guard cells

Explanation: Stoma are pores in the plant epidermis that function as gateways linking the intercellular gas spaces to the external environment.

• A. 50 times
• B. 65 times
• C. 70 times
• D. 75 times

Explanation: Option D is correct since 'Haemoglobin' is the most important protein present in many animals including man as it increases the…

• A. Water potential
• B. Osmotic potential
• C. Pressure potential
• D. None of these

Explanation: Correct Option: A(Definition) Water potential is the total kinetic energy of water.

• A. Subclavian artery
• B. Subclavian vein
• C. Iliac artey
• D. Iliac vein

Explanation: The transfer of lymph from lymph vessels to the blood occurs through the subclavian vein, not the subclavian artery, iliac artery, or…

• A. Cohesion
• B. Tension
• C. Adhesion
• D. Imbibition

Explanation: Cohesion is the sticking together between the molecules of the same substance.