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MDCAT
Biology
2017

Biology · Homeostasis

Work through this past-paper style MCQ, then read the full explanation. Practice more biology questions on mMCQ with adaptive practice and topic analytics.

Question

Animals which are unable to adjust their internal salt concentration according to the external environment are: 

Options
  • A

    Anhydrobiosis 

  • B

    Osmoregulators 

  • C

    Thermoregulatory

  • D

    Osmoconformers 

Explanation

Osmoconformers are organisms that maintain an internal osmotic pressure equal to their external environment, meaning they do not actively adjust their internal salt concentration. This is typical of many marine invertebrates. In contrast, osmoregulators actively control their internal osmolarity regardless of external conditions. Thermoregulatory processes manage temperature, and anhydrobiosis refers to surviving with minimal water, unrelated to salt regulation.

Anhydrobiosis is a survival strategy where organisms can survive extreme dehydration by entering a dormant state. It's not related to salt concentration management.

Osmoregulators actively maintain a constant internal salt concentration regardless of environmental changes, which is the opposite of what the question describes.

Thermoregulatory refers to maintaining internal temperature, not salt concentration, thus unrelated to the question.

Osmoconformers are organisms that do not regulate their internal salt concentration but instead allow it to match the external environment, making them the correct answer.

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Tagged under Biology · Homeostasis · 2017