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11th Biology Weekly Test - 1 ( Bio - Zoology - Excretion )

MABS Institution

11th Biology Weekly Test - 1 ( Bio - Zoology - Excretion )-Aug 2020

Time : 1.30 Hours

Part - A

Multiple Choice Question - Answer All Question

Normal urea level in human blood is about_______________

20-23 gms / 100 mL
17-30 mg / 100 mL
17 - 25 gms / 100 mL
15- 25 mg / 100 mL

The glomerular hydrostatic pressure is estimated to be______________

60 mm/ Hg
55 mm / Hg
110 mm / Hg
75 mm / Hg

___________part of nephron has evolved to form hypertonic urine.

Glomerulus
Loop of Henle
Proximal convoluted tubule
Collecting duct

Which is not a excretory organ?

Kidney
Lungs
Heart
Liver

Malpighian tubules remove excretory products from

mouth
oesophagus
haemolymph
alimentary canal.

Kidney stones are produced due to deposition of uric acid and

Silicates
Minerals
Calcium carbonate
Calcium oxalate

Identify the wrong match

Bowman's capsule - Glomerular filteration
DCT - Absorption of glucose
Henle's loop - Concentration of urine
PCT - Absorption of Na+ and K+ ions

A person who is on a long hunger strike and is , surviving only on water, will have

Less amino acids in his urine
Macula densa cells
Less urea in his urine
More sodium in his urine

Aldosterone acts at the distal convoluted tubule and collecting duct resulting in the absorption of water through

Aquaporins
Spectrins
GLUT
Chloride channels

The major function of Henle's loop is to concentrate_____________

Na⁺ and Cl^-
K⁺ ions
Na⁺ and K⁺ ions
Na^- and CI⁺ ions

Part - B

Generic 2 - Answer All Question

What is micturition?
Why are aquatic animals mostly ammonotelic in nature?

Why is the urine yellow in colour?

What is the effect of aldosterone on kidneys and where is it produced?

What is vasa recta?

Part - C

Generic 3 - Answer All Question

Match each of the following substances. with its mode of transportation in proximal tubular reabsorption.
(a) Na+ - Simple diffusion
(b) Glucose - Primary active transport
(c) Urea - Indirect active transport
(d) Plasma - Paracellular movement
(e) Proteins - Facilitated diffusion
(f) Water - Endocytosis

What solute is normally present in the body to estimate GFR in humans?

Why are Immunosuppressive drugs required for kidney transplantation?
In which segment of the nephron most of the reabsorption of substances takes place?

If the afferent arteriole of the nephron constricts, what happens to the GFR in that nephron? If the efferent arteriole constricts what happens to the GFR in that nephron? Assume that no auto regulation takes place.

Part - D

Generic 5 - Answer All Question

Write a note on a) Uremia b) Renal Calculi

Arrange the following structures in the order that a drop of water entering the nephron would encounter them
(a) Afferent arteriole
(b) Bowman's capsule
(c) Collecting duct
(d) Distal tubule
(e) Glomerulus
(f) Loop of Henle
(g) Proximal tubule
(h) Renal pelvis

Explain the tubular reabsorption process of urine formation.

Explain the structure of kidney.
What is tubular secretion? Name the substances secreted through the renal tubules.

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