NEET UG Biology Breathing and Exchange of Gases MCQs

IMPORTANT POINTS

• Removal of CO₂ and intaking O₂ is essential for cells during various processes in the body of organisms to take O₂ is inspiration and removeing co₂ is expiration processes. Both together called as breathing.

• In human for breathing activity nose, phalynx, larynx ,trachea,bronchi and lungs like organs makes togather respiratory system.

• Diagphram and intercostal muscel play important role in inspiration and expiration process. l In exchange and transport of resiratory gases O₂ and CO₂ both are transported, in this blood play important role.

• The process of respiration is regulating by nervous system and chemical

• Disorders of Respiratory system are Asthma,Emphysema, Occupational Respiratiory Disorders.

(1) Respiration is helpful in

(a) Removing waste from the body (b) Producing energy within the body

(c) Production of proteins (d) Production of carbohydrates.

(2) Respiration,occures in the presence of oxygen in called

(a) Fermentation (b)Anaerobic respiration (c) Glycolysis (d)Aerobic respiration

(3) The surface, from which the exchange of, gas takes place, is called

(a) Plasma surface (b)Respiratory substrates (c) Respiration surface (d)Gaseous surface.

(4) During respiration ____

(a) O₂ is produced and CO₂ is consumed (b) O₂ is consumed and CO₂ is produced

 (c) Both O₂ and CO₂ are produced (d) Both O₂ and CO₂ are consumed.

(5) A respiratory surface must be ?

(a) Thin (b) Moist (c) Wide spread (d) All these.

(6) Which of the following shows pulmonary respiration

(a) Sponge (b) Fishes (c) Coelentrate (d) Human

(7) What is called the Upper region of Pharynx in man ?

(a) Oropharynx (b) Nasopharynx (c) Laryngopharynx (d) None of these

(8) The diameter of human trachea is about

(a) 1 cm (b) 2.5 cm (c) 2 inches (d) 0.1 cm

(9) The length of human trachea is about (Gujarat C.E.T.Q.B.)

(a) 6 inches (b) 12 cm (c) 12 inches (d) 18 cm

(10) The trachea is supported by, cartilaginous rings,which are____shaped

(a) C (b) L (c) O (d) S

(11) Sound production in humans is controlled by

(a) Nares (b) Lungs (c) Larynx (d) Pharynx

(12) A lung contains many small balloon like air sacs. are called ____

(a) Gas spaces (b) Alveoli (c) Bronchi (d) Bronchioles

(13) The intake of air is called ?

(a) Venitlation (b) Inhalation (c) Exhalation (d) Respiration.

(14) Intercostal muscles regulate the movement of

(a) Ribs (b) Trachea (c) Diapharagm (d) Pharynx.

(15) The muscles present between ribs are called

(a) Phrenic muscles (b) Intercoslal muscles (c) Cardiac muscles (d) Voluntary muscles.

(16) During exhalation, the diaphragm moves

(a) Apart (b) Downwards (c) Upwards (d) Inwards

(17) Respiratory control centres are loacted in

(a) Lungs (b) Medulla oblongata (c) Spinal cord (d) Ribs

(18) The de-oxygenated blood from heart comes to the lungs by

(a) Pulmonary artery (b) Pulmonary vein (c) Branchial artery (d) Renal artery

(19) Oxygen containing blood transported from lungs is to heart by

(a) Pulmonary artery (b) Pulmonary vein (c) Branchial artery (d) Renal vein

(20) How much fraction of oxygen is transported to tissues through RBCs?

(a) 100% (b) 56% (c) 45% (d) 97%.

(21) H₂CO₃ is converted into CO₂ and H₂O with the help of an enzyme known as

(a) Carboxylase (b) Carbonic dehydrogenase (c) Carbonicenhydrase (d) Carbonic anhydrase.

(22) The metal ion present in haemoglobin is

(a) Iron (b) Magnesium (c) Copper (d) Zinc

(23) One RBC can transport about how many molecles of oxygen?

(a) One million (b) Ten million (c) One billion (d) Ten billion

(24) How many percentage of CO₂ transport in the form of carbamino compounds ?

(a) 70% (b) 90% (c) 5% (d) 20%

(25) The largest amount of CO₂ is transported in blood as

(a) Carbamino compounds (b) Bicarbonates (c) Carbonic acid -(d) Carbonate ions.