Do plant roots always grow downward?

Yes.



It's where the nutrient is.



Because plants are amoral.

Spanish Moss has no roots. It is able absorb moisture and nutrients directly from the atmosphere. It is not a moss, and is related to the pineapple. Although it grows on trees in eastern carolinas-it is not a parasite, other than using the trees for support.

Rap

An example of tree roots not growing downward is J rooted seedlings.
This is generally caused by an over or under supply of water. Sometimes having a nursery heat bed (used to increase the growing rate) set too high for that particular plant type will have that effect as well.

Tree roots generally grow toward moisture until it has access to the required amount of water. This is usually downward but not always. If a hard clay pan or rock shelf is encountered tree roots may grow sideways to access the volume of water required. In poorly drained soils tree roots will activley avoid stagnant water which might contain pathogens damaging to trees.

Trees have adapted to variouse environments in variouse ways, for example in an area with low, light rainfalls the soil moisture can be less in the subsoil than the top soil. In this case trees can adapt in several different ways, deep roots to access subteranian moisture or shallow roots to take immediate advantage of any minor rainfall or even dew. sometimes they will store exess water in special cell structures see Australian baobab trees. Nutrients do play a role but are usually dissolved in water before trees have access.

Roots grow up down under.

Actually, I think they grow down for water more than nutrients. ll - you ask if they always grow down.... do you mean as opposed to up? Because sometimes roots grow laterally (outward) as much as down.

Roots grow downwards in response to gravity.
In microgravity (in orbit) they tend to grow in a spiral.

There are cells in the roots that have tiny particles in them that cause cell growth and division. These particles are slightly heavier than the rest of the stuff inside the cells and so under gravity they basically fall slowly to the bottom of the cell where they trigger cell division ie. growth.

This is not a complete explanation as I am not a botanist or a biologist but it covers the basics.

That's what I told them.

My (gray) roots grow out

The dude in this vanity page says the roots grow where the gravity vector is headed. So in his cylinder haf way down the page, it rotates to give artifisial gravity making tree roots coming <<outwards>>

http://www.astroscience.org/abdul-ahad/firstarktoalphacentauri.htm

cool ;-) !

u stupid idot ur so dumb all plant grow upward nd downward u stupin idot

wat a dummy