100-word explainer: How plants recognise gravity?

Plants contain special gravity sensing cells at the root tip that contain starch-filled structures called ‘amyloplasts’ that are heavier than the other things in the plant cell, so they sink to the bottom. This helps plant to know that where amyloplasts are sunk is the ‘down direction’ and the way is the ‘up direction’. Plant use this gravity recognition process as a guide to spread the plant growth hormone auxin unevenly inside plant organs, and this directs root growth towards the ground and shoots grow towards the sky.

That’s why plant roots always grow ‘down’ and shoot always grow ‘up’.




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