Published by:
CGP EDU Academic Team
Published on: August 11, 2026
Read the following statements and identify the correct ones.
A
Many nitrogen containing substances, ions, 
, water, etc., that accumulate in the body have to be eliminated.
A and B only
, water, etc., that accumulate in the body have to be eliminated. A and B only
B
Nature of nitrogenous wastes formed and their excretion vary among animals.
A, B and C
A, B and C
C
Ammonia, urea and uric acid are the major nitrogenous wastes excreted.
C and D only
C and D only
D
Protonephridia are the common excretory organs in all invertebrates.
B, C and D
B, C and D
Text Solution
Verified by ExpertsThe correct answer is:
B
• 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.
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