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You can ripen avocados by putting them in a paper bag with an apple. This is due to a chemical called ethylene. What else does ethylene do for plants?

Answer:

Ethylene speeds up growth of branches, leaves, and flowers. It plays a role in plants losing their leaves, as well as dropping flower petals and fruit. It speeds up the germination of seeds. It causes fruits and vegetables to ripen faster, and spoil faster. It can stimulate or speed up many of the common processes that happen in plants.
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