Because their growing.
tap root
They are just tiny roots that grow from other roots and look a bit like hair.
Starch
the tiny hairs are called CILIA
Pretty self explanatory, root hairs are hairs on roots. Root hairs are basically tiny projections on the root which can grow through the spaces between soil particles, and they add a great amount of surface area to the roots. result: more water intake.
Adrenaline stimulates tiny muscles to pull the roots of our hairs, thereby making them stand up on our skin.
no tap roots are not the same as root hairs, root hairs are more of fibrous roots, on a plant there can only be one major tap root yet there can be many root hairs.
because it is a compatition with the other roots for water..
Roots Hairs Absorb WATER
cilia
Tiny hairs in your ear conduct vibration and convey that to your brain