Students of class 11 Biology should refer to MCQ Questions Class 11 Biology Breathing and Exchange of Gases with answers provided here which is an important chapter in Class 11 Biology NCERT textbook. These MCQ for Class 11 Biology with Answers have been prepared based on the latest CBSE and NCERT syllabus and examination guidelines for Class 11 Biology. The following MCQs can help you to practice and get better marks in the upcoming class 11 Biology examination

Chapter 17 Breathing and Exchange of Gases MCQ with Answers Class 11 Biology

MCQ Questions Class 11 Biology Breathing and Exchange of Gases provided below have been prepared by expert teachers of grade 11. These objective questions with solutions are expected to come in the upcoming Standard 11 examinations. Learn the below provided MCQ questions to get better marks in examinations.

Question. Plasma protein which helps in osmotic balance is:
(a) Albumin
(b) Globulin
(c) Fibrinogen
(d) Heparin

Question. Match the following:

Column-I	Column-II
I. Heart attack	i. Due to closer of atrioventricular valves
J. Lubb sound	ii. Heart muscle is suddenly damaged
K. Cardiac arrest	iii. Due to closer of semilunar valves
L. Dubb sound	iv. Heart stop pumping blood effectively
	v. Heart stop beating

(a) I-ii, J-iii, K-iv, L-i 
(b) I-iv, J-i, K-v, L-iii
(c) I-ii, J-i, K-v, L-iii 
(d) I-ii, J-i, K-iv, L-iii

Question. Pacemaker of heart is
(a) AV node
(b) Purkinje fibres
(c) Bundle of his
(d) SA node

Question. The pathway of blood from left ventricle of the heart to the right atrium is:
(a) Pulmonary circulation
(b) Systemic circulation
(c) Open circulation
(d) Both 1 and 2

Question. Which part of the gut shows the negligible amount of absorption of substance?
(a) Large intestine 
(b) Oesophagus
(c) Stomach 
(d) Small intestine

Question. Find the incorrect pair.
(a) Human – Ureotelic
(b) Birds – Uricotelic
(c) Lizard – Uricotelic
(d) Whale – Ammonotelic

Question. Read the following statements about the excretory system in humans:
I. A fall in GFR can activate the JG cells to release renin.
II. ADH can also affect the kidney function by its constrictory effect on blood vessels.
III. The proximity between the Henle’s loop and vasa recta , as well as the countercurrent in them help in maintaining an increasing osmolarity towards the outer medullary interstitium.
IV. Our lungs remove large amounts of CO₂ (108 litres/day ) .
V. Renal calculi are the stone or insoluble mass of crystallised salts like oxalates within the kidney.
How many of the above statements are incorrect?
(a) None
(b) One
(c) Two
(d) Three

Question. The renin-angiotensin mechanism to increase blood pressure involves organs in the following order:
(a) Kidney- Liver- Lungs- Adrenal gland- Kidney
(b) Kidney- Lungs- Liver- Adrenal gland- Kidney
(c) Kidney- Liver- Adrenal gland- Lungs- Kidney
(d) Kidney- Lungs – Adrenal gland- Liver- Kidney

Question. The maximum reabsorption of water without the influence of ADH takes place at-
(a) Proximal convoluted tubule
(b) Henle’s loop
(c) Distal convoluted tubule
(d) Collecting duct

Question. Which of the following statement about dialysis is incorrect?
(a) Blood drained from a convenient artery is pumped into a dialysis unit after adding an anticoagulant like heparin.
(b) The dialysis unit contains a coiled cellophane tube surrounded by a dialyzing fluid.
(c) The cleared blood is pumped back to the body through a vein after adding antiheparin to it.
(d) The dialyzing fluid have exactly the same composition as that of plasma.

Question. In majority of humans, the loop of Henle is:
(a) Too short and extends only very little into the cortex.
(b) Too long and extends very deep into the cortex.
(c) Too short and extends only very little into the medulla.
(d) Too long and extends very deep into the medulla. 

Question. Renin is secreted by:
(a) Juxtaglomerular cells of juxtamedullary nephrons in response high blood pressure.
(b) Juxtaglomerular cells of juxtamedullary nephrons in response low blood pressure.
(c) Juxtaglomerular cells of cortical nephrons in response high blood pressure.
(d) Juxtaglomerular cells of cortical nephrons in response increase osmomolarity.

Question. Identify the diagram and select the correct option.

Question. Sebaceous gland eliminates certain substances like ———– through sebum.
(a) Sterols, hydrocarbons and waxes
(b) NaCl, urea and lactic acid
(c) Sterols, hydrocarbons, urea and waxes
(d) NaCl, Sterols, hydrocarbons and urea

Question. Find out correct statement :
(a) About 97 percent of O₂ is transported by RBCs in the blood
(b) About 90-93 percent of CO₂ is transported by RBCs is the blood
(c) About 7 percent of O₂ and 3 percent of CO₂ is carried in dissolved form through plasma
(d) More than one are correct

Question. The total volume of air accommodated in the lungs at the end of forced inspiration is sum total of :
(a) IRV + TV + ERV
(b) ERV + TV + RV + IRV
(c) TV + IRV
(d) IRV + TV + RV

Question. The amount of O₂ delivered by 100 ml blood to the tissue under normal physiological condition :
(a) 200 ml
(b) 5 ml
(c) 1.34 ml
(d) 20 ml

Question. Primary, secondary, tertiary bronchi and initial bronchioles are supported by :
(a) Complete cartilaginous rings
(b) Incomplete cartilaginous rings
(c) Complete chitinous rings
(d) Incomplete chitinous rings

Question. Which of the following is primary muscle of inspiration ?
(a) Abdominal muscles
(b) Oblique muscles
(c) Intercoastal muscles
(d) Diaphragm

Question. Which of the following statement is/are true ?
(a) Diffusion capacity of CO₂ is 20-25 times higher than that of O₂
(b) The solubility of CO₂ is 20-25 times higher than that of O₂
(c) The diffusion capacity of O₂ is 20-25 times higher than that of CO₂
(d) More than one statements are correct.

Question. Which statement is true ?
(a) By the contraction in diaphragm, volume of thoracic cavity increases dorso-ventrally.
(b) By the contraction in diaphragm, volume of thoracic cavity increases antero-posterior axis.
(c) By the contraction in EICM, volume of thoracic cacity increases antero-posterior axis
(d) By the contraction in IICM, volume of thoracic cavity increases in antero-posterior axis.