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Zorluk: OrtaVertebrates: Poikilothermic Classes (Pisces, Amphibia, Reptilia)

During the developmental metamorphosis of an amphibian, the aquatic larval stage (tadpole) exhibits distinct physiological adaptations before transforming into a terrestrial adult. Which pair of respiratory organs and primary nitrogenous waste products correctly characterizes the larval tadpole stage?

  1. Gills and ammoniaCevap
  2. B
    Lungs and urea
  3. C
    Moist skin and uric acid
  4. D
    Gills and uric acid

Cevap

Gills and ammonia
Amphibian larvae (tadpoles) are fully aquatic organisms. They utilize gills for respiration and excrete nitrogenous waste in the form of highly soluble, toxic ammonia (ammonotelism). During metamorphosis, they transition to using lungs and skin for respiration and excreting less toxic urea (ureotelism).

Adım Adım Çözüm

1
Identify the respiratory apparatus of larval amphibians (tadpoles).
Amphibian tadpoles live in water and rely primarily on external and internal gills for gas exchange.
Lungs develop later during metamorphosis into terrestrial adults.
2
Determine the primary nitrogenous waste excreted by aquatic tadpoles.
Aquatic tadpoles are ammonotelic, meaning they excrete nitrogenous waste predominantly as ammonia.
Ammonia requires abundant water for safe excretion due to its high toxicity and solubility.

Anahtar Kavram

Respiratory and Excretory Transitions in Amphibian Metamorphosis
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Konular

Vertebrates: Poikilothermic Classes (Pisces, Amphibia, Reptilia)

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