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AP® Biology

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Moderate

Long-Day Plants

APBIO-HEL1AF

Identify the conditions under which long-day plants will flower.

A

The length of daylight exposure exceeds the critical photoperiod (critical night length).

B

The length of daylight is less than the critical length of darkness.

C

Abundant water and warmth are present to induce germination.

D

The axial buds start to grow and bend toward light due to auxin elongating cells on the dark side of the stem.