Question

Match the excretory organs with the animals given. Choose the answer which gives the correct combination of alphabets of the two columns.

List 1	List 2
A. Nephridia	1. Earthworm
B. Malpighian tubules	2. Cockroach
C. Protonephridia	3. Shark
D. Kidneys	4. Liver fluke

• A. A=2, B=4, C=3, D=1
• B. A=1, B=2, C=4, D=3
• C. A=4, B=2, C=1, D=5
• D. A=2, B=5, C=4, D=3

Answer 1

The correct option is B A=1, B=2, C=4, D=3

• In most invertebrates, the excretory structures are simple tubular forms whereas vertebrates have complex tubular organs called kidneys. The shark is a vertebrate and has kidneys as excretory structures.
• Protonephridia or flame cells are the excretory structures in Platyhelminthes (Flatworms, e.g., Planaria), rotifers, some annelids, and the cephalochordate Amphioxus. Protonephridia are primarily concerned with ionic and fluid volume regulation, i.e., osmoregulation.
• Nephridia are the tubular excretory structures of earthworms and other annelids like leech. Nephridia help to remove nitrogenous wastes and maintain a fluid and ionic balance.
• Malpighian tubules are the excretory structures of most insects including cockroaches. Malpighian tubules help in the removal of nitrogenous waste and osmoregulation.

So, the correct answer is option B.