Thursday, November 12, 2020

Excretory Products and Their Elimination | Class 11 | Previous Years Questions and Answers (2015 to 2020)

 EXCRETORY PRODUCTS AND THEIR ELIMINATION


2020 MARCH


1.   Find out the suitable term from the box for the disorders stated. (Score 2)
(i) Accumulation of Urea in blood.
(ii) Insoluble mass of crystallised salts in the kidney.
(iii) Surgical method for the correction of Renal failures.
(iv) Inflammation of glomeruli of kidney.


Dialysis, Kidney transplantation, Glomerulonephritis, Uremia, Renal Calculi

✔️Answer:


i.  Uraemia

ii. Renal calculi

iii. Kidney transplantation

iv. Glomerulonephritis


2.   Complete the flow chart showing the regulation of kidney functioning by Juxta Glomerular Apparatus and Adrenal Cortex. (Score 2)


      ✔️Answer:


A= Renin

B= Angiotensin I

C= Aldosterone

D= Rise in GFR


2019 JULY (IMPROVEMENT)


1.   State whether the following statements are true/false. If false, correct it.

a.  ADH prevents diuresis.

b.  ANF causes the increase of blood pressure.

c.  Angiotensin-l activate adrenal cortex to release aldosterone.

d.  Aldosterone causes the reabsorption of Na+ and water from the distal part of renal tubule.


✔️Answer:


(a) True

(b) False. ANF decreases blood pressure.

(c) False. Angiotensin-II activates adrenal cortex to release aldosterone.

(d) True.


2019 MARCH


1.   Classify the following animals on the basis of the mode of nitrogenous waste excretion in the table given below (Score 2)


Mammals, Birds, Bony fishes, Reptiles, Terrestrial amphibians, Aquatic amphibians


Ammonotelic

Ureotelic

Uricotelic

 

 

 


✔️Answer:

Ammonotelic

Ureotelic

Uricotelic

Bony fishes

Aquatic amphibians

Mammals

Terrestrial amphibians

Birds

Reptiles


2.   a) Give one word for the following:

             i.    Presence of Glucose in Urine.

             ii.   Presence of Ketone bodies in Urine.

b) Which human disorder is having the above mentioned two symptoms? (Score 2)


✔️Answer:


a) i. Glycosuria. ii. Ketonuria

b) Diabetes mellitus


2019 MODEL


1. Complete the following sentences. (Score 2)


    (a) Reabsorption of water from DCT is facilitated by the hormone ……………
    (b) Kidney failure can cause a bone disorder called ………………
    (c) Angiotensin II activate adrenal cortex to release ……………
    (d) In case of kidney failure, urea can be removed by the process called ……………


✔️Answer:


(a) ADH (Vasopressin)

(b) Gout/ Osteoporosis

(c) Aldosterone

(d) Haemodialysis


2018 AUGUST


1.   Some conditions related to kidney disease are given
Accumulation of urea in blood.
malfunction of kidney

        a) Name the condition.

        b) In your opinion, suggest the treatments for kidney failure and acute kidney failure? (Score 2)


✔️Answer:


(a) Uraemia.

(b) For kidney failure: Haemodialysis.

      For acute kidney failure: Kidney transplantation.


2018 MARCH


1.   a) Expand GFR.
b)
Even though GFR in a healthy person is 180 liters per day, the amount of urine released Per day is only about 1.5 litres. Give a reason. (Score 2)


✔️Answer:


(a) Glomerular Filtration Rate.

(b) About 99% of the filtrate is reabsorbed by the renal tubules (Tubular reabsorption).


2018 MODEL


1.   a) Write the significance of reabsorption in urine formation. (Score 2)
b) Of the following substances which one is reabsorbed by active transport?

Glucose, Nitrogenous waste, Water


✔️Answer:


(a) Conservation of water and useful substances. Concentration of urine.

(b) Glucose


2.   Fish: ammonotelic: : Cockroach:……….. (Score ½)


✔️Answer: Uricotelic


3.   “The functioning of the kidneys is efficiently monitored and regulated by the heart to certain extent”
Do you agree with this statement? Justify your answer.
(Score 2)


✔️Answer:


Yes.

An increase in blood flow to the atria of the heart causes the release of Atrial Natriuretic Factor (ANF). ANF check on the renin- angiotensin mechanism. It causes vasodilation to decrease blood pressure.


2017 MARCH


1.   Prepare 2 matching pairs from the given list of animals and excretory organs. (Score 2)

 

Animals

Excretory organs

a) Prawn

i) Nephridia

b) Cockroach

ii) Antennal gland

c) Earthworm

iii) Flame cell

iv) Kidneys


✔️Answer:


Animals

Excretory organs

a) Prawn

ii) Antennal gland

c) Earthworm

i) Nephridia

 

MARCH 2016


1.   “The functioning of human kidney is efficiently monitored and regulated by hormonal actions of hypothalamus, pituitary, JGA and to a certain extent by heart”


    a) Do you agree with this statement’? 
    b) Justify your answer with suitable reasons. (Score 2)


✔️Answer:


(a) Yes.

(b) When body fluid level decreases, the osmoreceptors stimulate hypothalamus to release ADH from neurohypophysis. It stimulates water reabsorption.

A fall in GFR activates the JG cells to release renin.

An increase in blood flow to the atria of the heart causes the release of Atrial Natriuretic Factor (ANF). It causes vasodilation to decrease blood pressure.


SEPTEMBER 2015 (IMPROVEMENT)


1.   Terrestrial animals are either ureotelic or uricotelic not ammonotelic. Evaluate the statement. (Score 2)


✔️Answer:


NH3 is highly toxic. So, excretion needs excess of water. So ammonotelism is found in aquatic animals. For the excretion of urea and uric acid, very less quantity of water is needed. So terrestrial animals are either ureotelic or uricotelic.


MARCH 2015


1.   Observe the figure given below and answer the questions. (Score 2)


a.  Write the name of the figure.

b.  Name the labelled part (A) and (B).


✔️Answer:


(a) Malpighian body (renal corpuscle).

       (b) A= Glomerulus, B= Bowman’s capsule.

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