Biology Chapter 1 - Gaseous Exchange In Humans

 

                        Biology Chapter 1 - Gaseous Exchange In Humans

Sure, here are 20 multiple-choice questions (MCQs) related to gaseous exchange in humans along with their answers:

Question 1: What is the primary gas exchanged during respiration?

A) Oxygen

B) Carbon dioxide

C) Nitrogen

D) Hydrogen

Answer: A) Oxygen

Question 2: In which organ does gaseous exchange primarily occur in humans?

A) Heart

B) Liver

C) Lungs

D) Kidneys

Answer: C) Lungs

Question 3: Which blood vessel carries oxygenated blood from the lungs to the heart?

A) Aorta

B) Pulmonary artery

C) Pulmonary vein

D) Coronary artery

Answer: C) Pulmonary vein

Question 4: During inhalation, what happens to the diaphragm?

A) It relaxes

B) It contracts and moves downward

C) It remains unchanged

D) It contracts and moves upward

Answer: B) It contracts and moves downward

Question 5: What is the main function of the respiratory system?

A) Pumping blood

B) Digesting food

C) Excreting waste

D) Exchanging gases

Answer: D) Exchanging gases

Question 6: Which structure prevents food from entering the trachea during swallowing?

A) Epiglottis

B) Tonsils

C) Uvula

D) Adenoids

Answer: A) Epiglottis

Question 7: Which gas is produced as a waste product of cellular respiration?

A) Oxygen

B) Carbon dioxide

C) Nitrogen

D) Hydrogen peroxide

Answer: B) Carbon dioxide

Question 8: What is the role of hemoglobin in the respiratory system?

A) Producing mucus

B) Carrying oxygen in red blood cells

C) Filtering air in the lungs

D) Regulating blood pressure

Answer: B) Carrying oxygen in red blood cells

Question 9: Which process involves the exchange of gases between blood and body tissues?

A) Inhalation

B) Exhalation

C) Osmosis

D) Internal respiration

Answer: D) Internal respiration

Question 10: Which gas is most commonly found in the air we breathe?

A) Oxygen

B) Carbon dioxide

C) Helium

D) Hydrogen

Answer: A) Oxygen

Question 11: What is the name of the tiny air sacs in the lungs where gas exchange occurs?

A) Alveoli

B) Bronchi

C) Capillaries

D) Ventricles

Answer: A) Alveoli

Question 12: What drives the process of breathing?

A) Contraction of the diaphragm

B) Expansion of the ribcage

C) Relaxation of the trachea

D) Flow of blood

Answer: A) Contraction of the diaphragm

Question 13: During exhalation, what happens to the volume of the chest cavity?

A) It increases

B) It decreases

C) It remains unchanged

D) It fluctuates

Answer: B) It decreases

Question 14: What is the main function of the cilia in the respiratory tract?

A) Producing mucus

B) Transporting oxygen

C) Filtering out dust and debris

D) Contracting the bronchi

Answer: C) Filtering out dust and debris

Question 15: Which of the following factors can stimulate increased breathing rate?

A) High oxygen levels

B) Low carbon dioxide levels

C) Low acidity in blood

D) Elevated pH

Answer: B) Low carbon dioxide levels

Question 16: Which part of the brain is responsible for controlling the basic rhythm of breathing?

A) Cerebellum

B) Hypothalamus

C) Medulla oblongata

D) Corpus callosum

Answer: C) Medulla oblongata

Question 17: What is the purpose of the mucous lining in the respiratory tract?

A) Gas exchange

B) Producing oxygen

C) Trapping dust and pathogens

D) Increasing lung capacity

Answer: C) Trapping dust and pathogens

Question 18: Which respiratory disorder is characterized by inflammation and narrowing of the airways, leading to difficulty in breathing?

A) Asthma

B) Bronchitis

C) Pneumonia

D) Emphysema

Answer: A) Asthma

Question 19: What is the term for the maximum volume of air a person can exhale forcefully after a maximum inhalation?

A) Tidal volume

B) Inspiratory reserve volume

C) Expiratory reserve volume

D) Vital capacity

Answer: D) Vital capacity

Question 20: What gas do plants release during photosynthesis that humans use for respiration?

A) Oxygen

B) Carbon dioxide

C) Nitrogen

D) Hydrogen

Answer: B) Carbon dioxide