If a long day plant has a critical night length of 9 hours, which 24 hour cycle would prevent flowering

If a long day plant has a critical night length of nine hours, the 24 hour cycle of 14 light hours to 10 dark hours would prevent flowering. This is due to the fact that long day plants require a shorter night length than the critical night length for flowering to occur. Therefore, if the plant has a critical night length of 9 hours, the night length needs to be more than 9 hours to prevent flowering,

The answer would be b. it is a learned trait

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