Free Digestion MCQs with Answers

• A. Nutrient supply to lungs
• B. Elimination of waste products from the lungs
• C. Oxygenation of deoxygenated blood
• D. Nutrient supply to heart

Explanation: Pulmonary circulation is required for the exchange of gases between the blood and the air in the lungs.

• A. Tricuspid valve
• B. Semilunar valves
• C. Bicuspid valve
• D. Tricuspid valve and bicuspid valve

Explanation: The closure of the semilunar valves is associated with the second heart sound, which is also known as the dub.

• A. Closing of A V valves
• B. Opening of A V valves
• C. Closing of semilunar valves
• D. Opening of semilunar valves

Explanation: The closure of the semilunar valves is associated with the second heart sound, which is also known as the dub.

• A. Concentration of solutes in the cell sap is high
• B. Plant is rapidly respiring
• C. They are separated from soil by a permeable membrane
• D. Concentration of salts in the soil is high

Explanation: The concentration of water in the soil is greater than the concentration of water in the root hairs.

• A. Soil→Root hair cell wall→Cortex→Endodermis→Pericycle→Protoxylem→Metaxylem
• B. Cortex→Root hair→Endodermis→Pericycle→Protoxylem→Metaxylem
• C. Pericycle→Soil→Root hair→Cortex→Endodermis→Protoxylem→Metaxylem
• D. Soil→Root hair cell wall→Cortex→Pericycle→Endodermis→Protoxylem→Metaxylem

Explanation: The path of water from the soil to the secondary xylem is as follows: Soil: The water molecules are absorbed by the root hairs from the…

• A. Percentage of moisture more than that of stomatal cavity
• B. Percentage of moisture less than that of stomatal cavity
• C. Percentage of moisture equal in atmosphere and stomatal cavity
• D. High percentage of moisture

Explanation: Transpiration takes place when the outer atmosphere has a lower water potential than the water in the leaves of a plant.

• A. Excretion of minerals
• B. Cooling of leaves
• C. Uptake of Water
• D. Uptake of minerals

Explanation: Transpiration is the process of water loss from plants through their leaves.

• A. Connective tissue→circular smooth muscles→elastic layer→endothelium
• B. Connective tissue→elastic layer→endothelium→circular smooth muscles
• C. Connective tissue→endothelium→elastic layer→circular smooth muscles
• D. Circular smooth muscles→connective tissue→endothelium→elastic layer

Explanation: The layers of the artery wall, from the inside out, are: Endothelium: This is a single layer of cells that lines the inside of the artery.

• A. Ventricle and pulmonary artery
• B. Left atrium and left ventricle
• C. Ventricle and aorta
• D. Right atrium and right ventricle

Explanation: The tricuspid valve is present between the right atrium and right ventricle of the heart.

• A. Right ventricle
• B. Right atrium
• C. Left ventricle
• D. Left atrium

Explanation: The walls of the left ventricle are the thickest, followed by the walls of the right ventricle, the walls of the left atrium, and the…

• A. AV node
• B. Bundle of HIS
• C. SA node
• D. Ventricle muscles

Explanation: The heart's natural pacemaker is called the sinoatrial (SA) node. It is a small group of cells located in the upper right atrium of the…

• A. Ventricles of heart
• B. Aorta
• C. Auricles of heart
• D. Ventricles of brain

Explanation: Chordae tendinae are the strands of cardiac muscle fibers attached to the ventricular walls and the flaps of the AV valves.

• A. Ventricles of heart
• B. Aorta
• C. Auricles of heart
• D. Ventricles of brain

Explanation: Chordae tendinae are the strands of cardiac muscle fibres attached to the ventricular walls and the flaps of the AV valves.

• A. Narrow lumen
• B. Pigmented wall
• C. Strong muscular walls
• D. Valves

Explanation: Valves: Veins have valves that prevent blood from flowing backward. Arteries do not have valves.

• A. Iliac veins
• B. Hepatic portal veins
• C. Renal veins
• D. Hepatic veins

Explanation: The inferior vena cava (IVC) does not receive blood directly from the hepatic portal vein because the hepatic portal vein first drains…

• A. Tricuspid valve
• B. Bicuspid valve
• C. Semi lunar valve
• D. Mitral valve

Explanation: The outlet valves of the heart are called semilunar valves. They are located at the base of the aorta and the pulmonary artery.

• A. Arteries
• B. Veins
• C. Capillaries
• D. Present in all

Explanation: Capillaries are the smallest blood vessels in the body. They are only about one cell thick, and they allow nutrients and oxygen to pass…

• A. Towards thoracic duct
• B. Away from the thoracic duct
• C. Towards adenoids
• D. Towards axilla

Explanation: The flow of lymph is always unidirectional, meaning that it flows in one direction only.

• A. Lymph
• B. Interstitial fluid
• C. Intracellular Fluid
• D. Serum

Explanation: The fluid that leaks from the blood plasma into the spaces that surround the capillaries and tissue is known as interstitial…

• A. Oxyntic cells
• B. Absorptive cells
• C. Enterokinase
• D. Peptidase

Explanation: Trypsinogen is converted into trypsin by the action of enterokinase, an enzyme that is produced by the small intestine.