How do roots know to grow down­wards?

Kids Go Gardening - - Summer -

In­side roots there are mag­i­cal sen­sors called amy­lo­plasts. You need a pow­er­ful mi­cro­scope to see them. These amy­lo­plasts act like lit­tle switches that make the roots grow in the di­rec­tion of grav­ity. So, even if the root is fac­ing upwards when it comes out of the seed, it will al­ways turn to grow down towards the ground! Sci­en­tists call it ‘Grav­it­ropism’.

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