Plants send smell warnings
A plant being nibbled by a bug sends out a smell. Nearby plants smell it and make their leaves tougher so bugs do not like to eat them.
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Examples
- A cut lawn smells of fresh grass; that smell can tell nearby grass that damage happened.
- When one tomato plant has aphids, a nearby tomato plant can grow tougher leaves.
Key takeaways
- Plants can send messages through the air using smells.
- A warned plant can change its leaves to make them harder for insects to eat.
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