MERIT YARD

Class 11th Biology - Breathing and Exchange of Gases

Question 1 / 40Which of the following is the actual site of gas exchange in the human lungs?

A) Bronchioles

B) Trachea

C) Alveoli

D) Bronchi

Question 2 / 40Larynx is a cartilaginous box which helps in sound production and hence called:

A) Sound box

B) Wind pipe

C) Glottis

D) Pharynx

Question 3 / 40What is the approximate Tidal Volume (TV) in a healthy human?

A) 1000 mL

B) 500 mL

C) 1200 mL

D) 2500 mL

Question 4 / 40The volume of air left in the lungs after a maximum forceful expiration is:

A) Residual Volume (RV)

B) Vital Capacity (VC)

C) Tidal Volume (TV)

D) Expiratory Reserve Volume (ERV)

Question 5 / 40What percentage of oxygen is transported by RBCs in the blood?

A) 3%

B) 70%

C) 97%

D) 25%

Question 6 / 40The majority of Carbon dioxide (about 70%) is transported as:

A) Carbamino-hemoglobin

B) Bicarbonate ions

C) Dissolved in plasma

D) Carbonic acid

Question 7 / 40Binding of oxygen with hemoglobin is primarily related to:

A) Partial pressure of O2

B) Partial pressure of CO2

C) Temperature

D) Hydrogen ion concentration

Question 8 / 40Asthma is a respiratory disorder characterized by:

A) Damage to alveolar walls

B) Inflammation of bronchi and bronchioles

C) Infection of the trachea

D) Bleeding in lungs

Question 9 / 40One molecule of hemoglobin can carry a maximum of:

A) Two molecules of O2

B) Four molecules of O2

C) Six molecules of O2

D) Eight molecules of O2

Question 10 / 40The Pneumotaxic center which can moderate respiratory rhythm is located in:

A) Pons region of brain

B) Medulla oblongata

C) Cerebrum

D) Cerebellum

Question 11 / 40Solubility of CO2 is _____ higher than that of O2.

A) 2 times

B) 20-25 times

C) 50 times

D) 100 times

Question 12 / 40The thin muscular wall which separates thoracic and abdominal cavity is:

A) Diaphragm

B) Pleura

C) Intercostal muscle

D) Trachea

Question 13 / 40Earthworms respire through their:

A) Lungs

B) Moist cuticle (Skin)

C) Gills

D) Tracheal tubes

Question 14 / 40Oxygen dissociation curve is:

A) Linear

B) Sigmoid

C) Hyperbolic

D) J-shaped

Question 15 / 40Emphysema is a chronic disorder mainly caused by:

A) Dust pollution

B) Cigarette smoking

C) Bacterial infection

D) Cold weather

Question 16 / 40Vital Capacity (VC) is equal to:

A) ERV + TV + IRV

B) TV + RV

C) ERV + RV

D) TV + IRV

Question 17 / 40Inspiration is initiated by the contraction of:

A) Diaphragm

B) Abdominal muscles

C) Internal intercostal muscles

D) Lungs

Question 18 / 40Partial pressure of CO2 in deoxygenated blood is:

A) 40 mm Hg

B) 45 mm Hg

C) 104 mm Hg

D) 95 mm Hg

Question 19 / 40Partial pressure of O2 in alveoli is:

A) 40 mm Hg

B) 95 mm Hg

C) 104 mm Hg

D) 159 mm Hg

Question 20 / 40Every 100ml of oxygenated blood delivers ____ of O2 to tissues.

A) 2 mL

B) 5 mL

C) 10 mL

D) 20 mL

Question 21 / 40Carbonic anhydrase enzyme is found in high concentration in:

A) Plasma

B) RBCs

C) WBCs

D) Platelets

Question 22 / 40Epiglottis is made of:

A) Elastic cartilage

B) Hyaline cartilage

C) Bone

D) Muscle

Question 23 / 40The respiratory center in medulla is sensitive to:

A) CO2 and H+ concentration

B) O2 concentration

C) Nitrogen concentration

D) Blood pressure

Question 24 / 40Mountain sickness at high altitude is due to:

A) Low CO2

B) Low partial pressure of O2

C) High temperature

D) Low humidity

Question 25 / 40Pleural fluid is found between:

A) Trachea and Bronchi

B) Two pleural membranes

C) Alveoli and blood vessels

D) Heart and Lungs

Question 26 / 40Trachea divides into right and left primary bronchi at the level of:

A) 3rd thoracic vertebra

B) 5th thoracic vertebra

C) 7th thoracic vertebra

D) 1st lumbar vertebra

Question 27 / 40Which gas has the highest affinity for hemoglobin?

A) O2

B) CO2

C) CO (Carbon monoxide)

D) N2

Question 28 / 40Functional Residual Capacity (FRC) is:

A) ERV + RV

B) TV + RV

C) VC + RV

D) TV + ERV

Question 29 / 40Common passage for food and air is:

A) Larynx

B) Pharynx

C) Trachea

D) Esophagus

Question 30 / 40Which of the following is an occupational respiratory disorder?

A) Asthma

B) Emphysema

C) Silicosis

D) Botulism

Question 31 / 40Expiratory capacity (EC) is:

A) TV + ERV

B) TV + IRV

C) ERV + RV

D) VC + RV

Question 32 / 40Diffusion membrane consists of _____ layers.

A) Two

B) Three

C) Four

D) Five

Question 33 / 40Haldane effect is related to:

A) O2 transport

B) CO2 transport

C) pH of blood

D) Chloride shift

Question 34 / 40Inspiration involves contraction of ____ muscles.

A) External intercostal

B) Internal intercostal

C) Smooth

D) Cardiac

Question 35 / 40Residual volume is approximately:

A) 500 mL

B) 1100 - 1200 mL

C) 2500 mL

D) 6000 mL

Question 36 / 40Air filled in the dead space is about:

A) 500 mL

B) 150 mL

C) 1000 mL

D) Zero

Question 37 / 40Volume of air inhaled or exhaled by a forceful effort is:

A) Tidal volume

B) Reserve volume

C) Residual volume

D) Dead space

Question 38 / 40Oxyhemoglobin dissociates at:

A) Alveoli

B) Tissues

C) Left atrium

D) Trachea

Question 39 / 40Normal breathing rate per minute is:

A) 72 times

B) 12-16 times

C) 20-25 times

D) 5-10 times

Question 40 / 40The maximum volume of air a person can breathe in after forced expiration is:

A) Total lung capacity

B) Vital capacity

C) Inspiratory capacity

D) Tidal volume

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