Match the excretory organs listed under column I with the animals given under column II . Choose the answer which gives the correct combination of alphabets of the two columns.

Column I
(Excretory organs)

Column II
(Animals)
A
Nephridia
p
Hydra
B
Malpighian tubules
q
Leech
C
Protonephridia
r
Shark
D
Kidneys
s
Round worms

t
Cockroach

A - q; B - t; C - s; D - r

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A - s; B - q; C - p; D - t

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A - t; B - q; C - s; D - r

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A - q; B - s; C - t; D - p

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Solution

The correct option is A $A - q; B - t; C - s; D - r$
The cattle leech the nephridia open to the outside by 17 pairs of nephridiopores on segments 6 to 22. The excretory organ of cockroach is the malpighian tubules. It is found at the junction of the midgut and hind gut and are about 150 in number. Bundles of flame cells are called protonephridia. The function of these cells is to regulate the osmotic pressure of the round worm, and maintain its ionic balance. The shark has two dark coloured kidneys on either side of the midline.

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	Column I (Excretory organs)		Column II (Animals)
A	Nephridia	p	Hydra
B	Malpighian tubules	q	Leech
C	Protonephridia	r	Shark
D	Kidneys	s	Round worms
		t	Cockroach