07: The Excretory System : Icse-x-biology

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ICSE-X-Biology

07: The Excretory System

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Exercise

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Section : A
A. Multiple Choice Type: (Select the most appropriate option in each case)

Qstn #1
Excretion primarily involves (a) removal of all byproducts during catabolism (b) removal by products during anabolism (c) removal of nitrogenous wastes (d) throwing out excess water
Ans : (c) Removal of nitrogenous wastes.

Qstn #2
Maximum amount of water from the glomerular filtrate is reabsorbed in

#2-a
proximal convoluted tubule (b) descending limbs of loop of Henle (c) ascending limb of loop of Henle (d) distal convoluted tubule
Ans : Proximal convoluted tubule

Qstn #3
Which one of the following in real sense is NOT an excretory activity? (a) giving out carbon dioxide (b) passing out a faecal matter (c) sweating (d) Removal of urea
Ans : (c) Sweating

Qstn #4
In humans, urea is formed in (a) ureter (b) liver (c) spleen (d) Kidney
Ans : (b) liverB. Very Short Answer type

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Section : B

Qstn #1
Name the following:

#1-a
The organ which produces urea
Ans : Liver

#1-b
The outer region of kidney containing the Bowman's capsule
Ans : Cortex

#1-c
The tuft of capillaries inside the Bowman's capsule
Ans : Glomerulus

#1-d
The part of kidney tubules where the term urine is first used for the fluid in it
Ans : Collecting duct

#1-e
The vein in which urea concentration is maximum
Ans : Renal artery (Renal vein has urea but renal artery has higher concentration of urea as compared to renal vein).

Qstn #2
Given below are two sets (a and b) of five terms each. Rewrite the terms in their correct order so as to be in logical sequence.