Practice question
Question
Long-day plants flower when:
Explanation
Night length < critical (B) is correct here. This is core PSS-Sec-E-Sensory biology: once you know the definition or pathway step, Night length < critical is the clear fit. The wrong ones are A) Day length < critical; C) Night length > critical; D) Under darkness. If the topic is about gradients or potentials, water/solutes move from higher to lower of the relevant quantity.
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