Question

Select the INCORRECT statement from the following with respect to osmoregulation.

• A. Marine birds like Albatross have special salt glands near nostrils for osmoregulation.
• B. Marine organisms like sea turtles and marine iguanas have salt secreting glands to manage osmotic balance.
• C. Marine organisms are mostly osmoregulators because their body fluids and external environment are isoosmotic in nature.
• D. Fresh water forms and terrestrial organisms are osmoregulators.

Hint:

Animals whose body fluids are isosmotic with sea water do not regulate; they are osmoconformers.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept
Osmoregulators actively control water and salt levels. Osmoconformers let their body fluid match the surroundings.

Step 2: True statements
Albatross and other sea birds remove excess salt through salt glands near the nostrils. Sea turtles and marine iguanas also have salt-secreting glands. Freshwater and land animals are osmoregulators.

Step 3: Find the wrong one
Most marine animals have body fluids isosmotic with sea water, so they are osmoconformers, not osmoregulators.

Final Answer:
The statement calling most marine organisms osmoregulators is incorrect. \[ \boxed{\text{(C) }\text{Marine organisms are mostly osmoregulators because their body fluids and external environment are isoosmotic in nature.}} \]