Question

18. Read the following and answer questions from 18 (1) to 18 (iv).
Nitrogenous materials formed due to metabolic activities are needed to be removed. The biological
process involved in the removal of these harmful metabolic waste from the body is called
excretion. Different organisms used varied strategies to do this. Many unicellular organisms
remove these wastes by simple diffusion from the body surface into the surrounding water while
complex multi cellular organisms use specialised organs to perform the same function.
(i) The excretory organ of human beings include
a) A pair of kidneys, a pair of ureters, a urinary bladder and a urethra
b) A pair of kidney, A pair of urinary bladders, a ureter and a urethra
c) A pair of kidneys, a pair of ureters, a pair of urinary bladders and a urethra
d) A kidney, a ureter, a urinary bladder and a urethra
(ii) Which of the following statements are true about excretion in human beings.
1. Kidneys are primary excretory organs.
ii. The bladder is muscular, so it is under nervous control.
ui. Each kidney has large number of filtration units called nephrons.
ini. Urine is stored in urethra until the urge of passing is out.
a) I and il only
b) I and ill only
c) I, II, ill only
d) I and iv only
(iii) Study the table below and select the row that has the incorrect information,
Substance excreted
Excretory Organ
Nitrogenous Waste
(a) Kidneys
Urea
(b) Lungs
Sweat
(c) Skin
Sebum
(d) Oil Glands​

Answer 1

BAHI TERO KO PATA HAI MERKO NAHBAHI TERO KO PATA HAI MERKO NAHI :--)I :--)BAHI TERO KO PATA HAI MERKO NABAHI TERO KO PATA HAI MERKO NAHI :--)HI :--)