Why do onions have layers?
Show answer & explanation
Answer: Modified leaves store food
Modified leaves store food ✓ — Correct! Onion layers are actually modified leaves called 'scales' attached to a short underground stem (bulb). The bulb is a storage organ where the onion saves food (sugars) made during photosynthesis. Each fleshy layer is a scale leaf packed with nutrients. This stored energy helps the onion survive dormancy and quickly grow when conditions improve. Not all onions form bulbs - green onions don't!
Protection from insects — Wrong. Onion layers aren't for insect protection. They're modified leaves that store food (sugars and nutrients) for the plant. The onion bulb is an underground storage organ for surviving unfavorable conditions.
Multiple growth seasons — Wrong. Layers don't represent multiple seasons. Each layer is a modified leaf scale that stores food. The bulb forms in one season as a survival strategy, storing nutrients for dormancy and future growth.