07: The Excretory System : Icse-x-biology

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ICSE-X-Biology

07: The Excretory System

with Solutions - page 2

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#2-a
Afferent arteriole, renal vein, capillary network, glomerulus, efferent arteriole.
Ans : Afferent arteriole, glomerulus, efferent arteriole, capillary network, renal vein

#2-b
Renal artery, urethra, ureter, kidney, urinary bladder.
Ans : Renal artery, kidney, ureter, urinary bladder, urethra

Qstn #3
In each one of the following sets of body parts or substances or processed, pick out the one item which overall includes the remaining foir.

#3-a
Glomerular filtrate, bowman's capsule, ultrafiltration, glomerulus, blood plasma.
Ans : Ultrafiltration

#3-b
skin, liver, lungs, kidney, excretion
Ans : Excretion

#3-c
ADH, Water, pituitary, osmoregulation, urine
Ans : Osmoregulation

#3-d
CO₂, bile pigments, water, excretion, urea.
Ans : Excretion

#
Section : C
Short

Qstn #1
Write down the functional activity of the following parts,

#1-a
Glomerulus .......
Ans : Glomerulus is involved in the process of ultrafiltration. The liquid part of the blood which is plasma including urea, salts, glucose filters out from the glomerulus into the renal tubule.

#1-b
Henle's loop ..........
Ans : Henle's loop is involved in reabsorption of water and sodium ions.

#1-c
Ureter ........
Ans : Ureter carries urine to the urinary bladder by ureteral peristalsis.

#1-d
Renal artery ...........
Ans : Renal artery supplied blood to the kidney.

#1-e
Urethra ............
Ans : Urethra is involved in the process of micturition i.e. expelling urine out of the body.

Qstn #2
Why is excretion necessary? Name the common excretory substance in our body.
Ans : Excretion helps in removing toxic wastes from our body and it also plays an important role osmoregulation i.e. the maintenance of the homeostasis of the body. Carbon dioxide, water, nitrogenous compounds such as urea, uric acid and excess salts are some common excretory products.