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’?
✔️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).