Why do plants grow faster at night?
Show answer & explanation
Answer: Stored energy used for growth
Less wind resistance at night — Wrong. Wind doesn't significantly affect growth rate. Night growth happens because plants shift from making energy (day) to using it for cell expansion (night).
Moonlight triggers hormones — Wrong. Moonlight doesn't control growth. Plants grow faster at night using energy (sugars) stored during photosynthesis to fuel cell division and elongation.
Stored energy used for growth ✓ — Correct! During day, plants photosynthesize and store energy as sugars. At night, they use this stored energy for cell division and elongation—physical growth. This is why seedlings appear taller in the morning! It's energy allocation: daytime = production, nighttime = construction.