Practice MCQ Questions and answers on Biology-GK

41

A man whose blood group is not known meet with a serious accident and needs blood transfusion immediately. Which one of the blood group mentioned below and readily available in the hospital will be safe for transfusion?

A) O, Rh^- B) O, Rh⁺ C) AB, Rh^- D) AB, Rh⁺

Discuss

Answer & Solution

Answer: Option A

Solution:

Donors with blood group O, Rh^- can donate to recipients with blood types A, B, AB and O (O is the universal donor), because it does not have any antigen, thereby no reaction would occur with the antibody, which may be present in donor's body. Hence, option A is correct.

42

Which letter indicates systolic pressure?

A) I B) B C) C D) A

Discuss

Answer & Solution

Answer: Option D

Solution:

Letter A indicates systolic pressure.

43

The first heart transplantation was performed by

A) Dr. W. Harbe B) Sir F.G. Hafkin C) Dr. Louis Pasteur D) Dr. C. Barnard

Discuss

Answer & Solution

Answer: Option D

Solution:

Christiaan Barnard with his team, performed the world's first human-to-human heart transplant operation on 3 December 1967.

44

Which of the following is true about blood plasma?

A) The main protein component is hemoglobin B) It is a faint yellow fluid C) It is the same as serum but without the clotting proteins D) It is about 90% water

Discuss

Answer & Solution

Answer: Option D

Solution:

The first option is incorrect because it is devoid of blood cell, also red blood cells so doesn’t contains haemoglobin. The second option is incorrect because plasma is colorless. The third option is also incorrect because plasma contains the clotting factors.

45

Most of the oxygen transported by the blood is

A) Bound to haemoglobin B) Dissolved in plasma C) Dissolved in water D) In ionic form as solute in plasma

Discuss

Answer & Solution

Answer: Option A

Solution:

Oxygen is carried in the blood in two forms: (1) dissolved in plasma and RBC water (about 2% of the total) and (2) reversibly bound to hemoglobin (about 98% of the total).

46

The audible sounds of heart are made by the closing of the

A) Arteries B) Veins C) Valve D) Ventricle

Discuss

Answer & Solution

Answer: Option C

Solution:

Closure of the heart valves is associated with an audible sound, called the heartbeat.

47

Which one is the largest artery in the human body

A) Radial Artery B) Ulnar Artery C) Aorta D) Arterioles

Discuss

Answer & Solution

Answer: Option C

Solution:

Most arteries carry oxygenated blood. The largest artery is the aorta, which is connected to the heart and extends into the abdomen.

48

Which veins do not carry deoxygenated blood?

A) Portal Veins B) Hepatic Veins C) Subclavian Veins D) Pulmonary Veins

Discuss

Answer & Solution

Answer: Option D

Solution:

Veins are blood vessels that carry blood towards the heart. Most veins carry deoxygenated blood from the tissues back to the heart; exceptions are the pulmonary and umbilical veins, both of which carry oxygenated blood to the heart.

49

Muscular wall of the heart is externally covered by

A) Epithelium B) Endothelium C) Epicardium D) Myocardium

Discuss

Answer & Solution

Answer: Option C

Solution:

The wall of the heart consists of three layers: the epicardium (external layer), the myocardium (middle layer) and the endocardium (inner layer).

50

The deposition of cholesterol on the walls of blood vessels causes the arteries to lose their elasticity and get stiffened is called

A) Hypotension B) Hypertension C) Systolic Pressure D) Arteriosclerosis

Discuss

Answer & Solution

Answer: Option D

Solution:

Atherosclerosis, sometimes called "hardening of the arteries," occurs when fat, cholesterol, and other substances build up in the walls of arteries.