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Explore TOEFL iBT DrillsAceThePrepTrap ForensicsTOEFL iBTHub →
TOEFL iBTListeningDetail Identification
Level 2 Trap Drill
Can you avoid the examiner's trap?Select an option to evaluate
Audio Transcript Excerpt: PROFESSOR: 'Deep-sea hydrothermal vents represent some of the most extreme environments on Earth, situated thousands of meters below the photic zone where hydrostatic pressure exceeds two hundred atmospheres. Yet these benthic ecosystems boast dense faunal assemblages—giant tube worms (*Riftia pachyptila*), vent shrimp, and vesicomyid clams. But because sunlight cannot penetrate to these abyssal depths, primary production cannot rely on photosynthesis. Instead, the entire trophic web is anchored by chemolithoautotrophic bacteria that oxidize dissolved hydrogen sulfide expelled from the vent chimneys, fixing inorganic carbon into organic carbohydrates via the Calvin cycle.'
According to the professor, what chemical compound serves as the primary energy donor for chemolithoautotrophic bacteria at hydrothermal vents?
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More Detail Identification Questions in TOEFL iBT

Tier 3TOEFL iBT

Audio Transcript Excerpt: PROFESSOR: 'In dendroclimatology, researchers analyze annual tree-ring widths to rec...

Inspect distractor trap
Tier 2TOEFL iBT

Audio Transcript Excerpt: PROFESSOR: 'To comprehend Mesoamerican agricultural sustainability, we must analyze ...

Inspect distractor trap
Tier 3TOEFL iBT

Audio Transcript Excerpt: PROFESSOR: 'In avian migratory navigation, European robins (*Erithacus rubecula*) ut...

Inspect distractor trap
Tier 2TOEFL iBT

Audio Transcript Excerpt: STUDENT: 'Hi, I need to pick up my student ID card. I submitted my photo online last...

Inspect distractor trap
Tier 3TOEFL iBT

Audio Transcript Excerpt: PROFESSOR: 'In materials engineering, the brittle-to-ductile transition in body-cent...

Inspect distractor trap