ACT Science Practice Question #1525 (Medium (29)) | Test Citadel
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ACT Science Difficulty: Medium (29)

Digital ACT Science Practice Question #1525

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Arabidopsis thaliana seeds were germinated on agar plates containing NaCl: - 0 mM NaCl: 98% germination - 50 mM NaCl: 92% germination - 100 mM NaCl: 64% germination - 150 mM NaCl: 28% germination - 200 mM NaCl: 4% germination What is the maximum NaCl concentration at which at least 50% of the seeds successfully germinated?
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64% >= 50% at 100 mM; drops below 50% at 150 mM.

Masterclass Solution & Distractor Trap Analysis

At 100 mM, germination is 64% (>= 50%). At 150 mM, it drops to 28% (< 50%). 100 mM is the highest concentration meeting the threshold....

Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...

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