Please refer to Excretory Products and Their Elimination Class 11 Biology Important Questions with answers below. These solved questions for Chapter 19 Excretory Products and Their Elimination in NCERT Book for Class 11 Biology have been prepared based on the latest syllabus and examination guidelines issued by CBSE, NCERT, and KVS. Students should learn these solved problems properly as these will help them to get better marks in your class tests and examinations. You will also be able to understand how to write answers properly. Revise these questions and answers regularly. We have provided Notes for Class 11 Biology for all chapters in your textbooks.

Important Questions Class 11 Biology Chapter 19 Excretory Products and Their Elimination

Objective Questions

Question. Which one plays an important role in counter current mechanism?
(a) Vasa recta
(b) PCT
(c) Loop of henle
(d) (a) and (c)

Question. Medullary gradient is developed by the following except
(a) Reabsorption of Na⁺ from ascending limb of henle’s loop into medullary intersitum
(b) Reabsorption of Na⁺ from descending limn of henle’s loop
(c) Diffusion of small amount of urea from collecting duct into medullary intersitum
(d) Proximity between henle’s loop and vasa recta as well as counter current in them

Question. Urea and uric acid are
(a) More toxic than NH₃
(b) Less toxic than NH₃
(c) Equally toxic to NH₃
(d) Non-toxic

Question. NH₃ is converted into urea in
(a) Kidney
(b) Liver
(c) Spleen
(d) Intestine

Question. Excretion of nitrogenous product in semisolid form by
(a) Uricotelic animals
(b) Urecotelic animals
(c) Ammonotellic animals
(d) Aminotes

Question. Which of the following in small amount retain in kidney matrix of some animals to maintain desired osmolarity?
(a) NH₃
(b) Urea
(c) Uric acid
(d) NH₃ and uric acid

Question. The less amount of water is lost with the exretion of which nitrogenous product
(a) NH₃ and urea
(b) NH₃ and uric acid
(c) NH₃
(d) Urea and uric acid

Question. Ammonia is the main nitrogenous excretory material in
(a) amphibians
(b) turtles
(c) tadpoles
(d) reptiles

Question. Why bony fishes, aquatic amphibian and aquatic insects are called ammonotelic animals?
(a) They excrete ammonia as their excretory product.
(b) They excrete ammonia as a least toxic nitrogenous waste product.
(c) They excrete uric acid in the form of pellet and paste with a minimum loss of water.
(d) These animals have nephridia as their excretory organ which helps to remove nitrogenous waste and
maintain a fluid and ionic balance.

Question. The projections of renal pelvis are called
(a) hiluses
(b) calyces
(c) medullary pyramids
(d) renal columns

Question. Glomerulus and Bowman’s capsule constitute
(a) nephrotome
(b) renal corpuscle
(c) renal capsule
(d) malpighian tubule

Question. Columns of Bertini in the kidneys of mammals are formed as extensions of
(a) Cortex into medulla
(b) Cortex into pelvis
(c) Medulla into pelvis
(d) Pelvis into ureter

Question. Which one of the following is not a part of a renal pyramid?
(a) Loops of Henle
(b) Peritubular capillaries
(c) Convoluted tubules
(d) Collecting ducts

Question. Juxta-glomerular apparatus is formed by cellular modification in the
(a) afferent arteriole and DCT
(b) efferent arteriole and PCT
(c) afferent arteriole and PCT
(d) efferent arteriole and DCT

Question. Which of the following components of blood does not enter into the nephron?
(a) Urea
(b) Water
(c) Glucose
(d) Plasma protein

Question. The site and principal mechanism for the passage of glucose into the bloodstream in the human kidney is the
(a) collecting duct, by active secretion.
(b) distal convoluted tubule, by passive diffusion.
(c) glomerulus, by selective reabsorption.
(d) proximal convoluted tubule, by selective reabsorption.

Question. Reabsorption of chloride ions from glomerular filtrate in kidney tubule occurs by
(a) active transport
(b) diffusion
(c) osmosis
(d) brownian movement

Matching Type Questions

Question. Match the disorders given in column-I with their feature given in column-II and choose the correct option.

Column-I (Disorders)	Column-II (Feature)
A. Uremia	I. Excess of protein in urine
B. Hematuria	II. Presence of high ketone bodies in urine
C. Ketonuria	III. Presence of blood cells in urine
D. Glycosuria	IV. Presence of glucose in urine
E. Proteinuria	V. Excess of urea in blood

(a) A – V; B -III; C – II; D – IV; E – I
(b) A – IV; B – V; C – III; D – II; E – I
(c) A – V; B -III; C – IV; D – II; E – I
(d) A – III; B -V; C – II; D – I; E – IV

Question. Which of the following hormone/enzyme is/are correctly paired with its function?
I. Renin – Enzyme that catalyses the formation of angiotensin I.
II. Aldosterone – Regulates water reabsorption at the distal convoluted tubule.
III. Anti-diuretic hormone (ADH) – It is a powerful vasoconstrictor that stimulates the secretion of aldosterone.
IV. Angiotensin II – Promotes reabsorption of sodium at distal convoluted tubule.
(a) Only I
(b) Only III
(c) I, II and III
(d) II, III and IV

Question. Select the option which shows correct matching of animal with there excretory organs and excretory product.

	Animal	Excretory organs	Excretory product
(a)	Housefly	Renal tubules	Uric acid
(b)	Labeo (Rohu)	Nephridial tubes	Ammonia
(c)	Salamander	Kidney	Urea
(d)	Peacock	Kidney	Urea

Question. Select the correct match of the types of neuron present in column I with its location given in column II.

Column I	Column II
A. Fall in GFR	I. Activate the JG cells to release renin
B. Angiotensin II	II. Increases the glomerular blood pressure and thereby GFR
C. Renin	III. Carries out the conversion of angiotensinogen in the liver to angiotensin I.
D. Aldosterone	IV. Causes reabsorption of Na+ and water from the distal parts of the tubule. This also leads to an increase in blood pressure and GFR.
E. An excessive loss of fluid from the body	V. Activate osmoreceptors which stimulate the hypothalamus to release ADH from the neurohypophysis

(a) A – I; B – II; C – III; D – V
(b) A – III; B – V; C – II; D – I
(c) A – III; B – I; C – IV; D – IV
(d) A – V; B – IV; C – III; D – II

Critical Thinking Type Questions

Question. Which of the following sets of animals produce the same substances as their chief excretory product?
(a) Fish, pigeon and frog
(b) Camel, housefly and snake
(c) Frog, monkey and dog
(d) Amoeba, ant and antelope

Question. The cells named podocytes occur in
(a) inner wall of Bowman’s capsule
(b) outer wall of Bowman’s capsule
(c) in the wall of glomerulus
(d) in the wall of Henle’s loop

Question. Filtration fraction is the ratio of
(a) glomerular filtration rate (GFR) to renal plasma flow (RPF)
(b) glomerular filtrate to urine
(c) haemoglobin to oxyhaemoglobin
(d) O₂ to CO₂

Question. Urine is hypertonic
(a) in Bowman’s capsule.
(b) in PCT.
(c) in the middle of descending & ascending limb of Henle’s loop.
(d) at the end of ascending limb of Henle’s loop.

Question. In nephron water absorption is maximum in
(a) proximal convoluted tubule (PCT).
(b) ascending limb of Henle.
(c) descending limb of Henle.
(d) distal convoluted tubule (DCT).

Question. Glomerular filtrate contains
(a) blood without blood cells and proteins
(b) plasma without sugar
(c) blood with proteins but without cells
(d) blood without urea

Question. The urine under normal conditions does not contain glucose because
(a) the normal blood sugar is fructose.
(b) glucose of blood is not filtered in the glomerulus.
(c) glucose in glomerular filtrate is reabsorbed in the uriniferous tubules.
(d) glucose in glomerular filtrate is converted into glycogen.

Question. Atrial natriuretic factor (ANF) is released in response to the increase in blood volume and blood pressure. Which of the followings is not the function of ANF? It
(a) stimulates aldosterone secretion.
(b) inhibits the release of renin from JGA.
(c) stimulates salt loss in urine.
(d) inhibits sodium reabsorption from collecting duct.

Question. Which of the following is likely to accumulate in dangerous proportion in the blood of a person whose kidney is not working properly?
(a) Ammonia
(b) Urea
(c) Lysine
(d) Sodium chloride