The Question is from neet-zoology animal-kingdom amphibia, and it was created by the author K SUNKANNA

Question

Which of the following accurately describes the unique respiratory adaptations observed in *Ascaphus truei* (tailed frog)?

K SUNKANNA · Accepted Answer

## CORE INFORMATION
✓ **Answer**: C
## CONCEPT FRAMEWORK
 **Primary Concept**: Respiratory adaptations in amphibians
 **Related Topics**: Cutaneous respiration, lung capacity, aquatic adaptations
 **Prerequisites**: Basic understanding of amphibian respiratory systems and environmental influences on respiration.
## SOLUTION PATHWAY
**Given Information**:
  The question asks about the respiratory adaptations of *Ascaphus truei*, a tailed frog.
  The options describe different respiratory mechanisms.
**Method & Steps**:
 1. Analyze each option based on the known characteristics of *Ascaphus truei* and its habitat.
  Reasoning: *Ascaphus truei* inhabits fast-flowing, cold-water streams.  These environments typically have high oxygen levels in the water but may have lower oxygen levels in the air.
 2. Evaluate the plausibility of each option in light of the frog's habitat and known adaptations.
  Working:
  A. Large lung capacity for prolonged dives is unlikely given their habitat preference for fast-flowing streams.
  B. External gills are not a characteristic of adult *Ascaphus truei*.
  C. Reduced lung surface area and increased cutaneous respiration makes sense, given the high oxygen levels in the water of their habitat.  It's an efficient way to uptake oxygen from the water through the skin.
  D.  A symbiotic relationship with algae is not a known respiratory adaptation for this species.
 3. Select the option that best fits the known biology of the species and its environment.
  Result: Option C is the correct answer.
  Verification: Option C aligns with the known adaptations of *Ascaphus truei* to its environment, emphasizing cutaneous respiration as a crucial adaptation to its cold, fast-flowing water habitat.
 ## OPTION ANALYSIS
A :x:  Large lung capacity is not a primary adaptation for *Ascaphus truei* in its fast-flowing stream environment. They don't need to hold their breath for extended periods underwater.
B :x:  Adult *Ascaphus truei* do not possess external gills. External gills are usually present in larval stages of amphibians.
C ✓: Reduced lung surface area and increased cutaneous respiration are adaptations perfectly suited to their cold, oxygen-rich water environment.  This allows them to efficiently absorb oxygen through their skin.
D :x: There's no evidence of a symbiotic relationship with algae for oxygen supply in *Ascaphus truei*.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Assuming all aquatic amphibians have large lung capacities for underwater dives:  Different aquatic amphibians have different respiratory strategies adapted to their specific environments.
  2.Confusing larval and adult respiratory structures:  Larval amphibians may have different respiratory structures than adults.
 **Quick Tips**:
  1.Consider the environmental factors (temperature, water flow, oxygen levels) when analyzing amphibian respiratory adaptations.
  2.Remember that cutaneous respiration is a significant respiratory mechanism for many amphibians, especially those living in aquatic or humid environments.

K SUNKANNA · Answer

Large lung capacity enabling prolonged underwater dives.

K SUNKANNA · Answer

Presence of external gills throughout its life cycle.

K SUNKANNA · Answer

The correct Option is "Reduced lung surface area and increased cutaneous respiration due to its fast-flowing, cold-water habitat."

K SUNKANNA · Answer

Symbiotic relationship with algae for oxygen supply.

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