Why do trees grow upwards, away from gravity?

Answer 1

All plants respond to tropisms, tropisms are sensed by phytohormones that respond to a variety of stimuli. The stimuli may be things such as gravity, light, touch, or photoperiod.

The answer to your question is that trees grow in two directions in response to gravity. The gravitropism is sensed and the levels of phytohormone concentration determines whether or not the stem grows and in what direction.

Phototropism is not responsible for a plant growing upward it is what causes a plant to grow toward light, regardless of the direction. In trees it causes the leaves to move the upper surface to face the light.

The roots have a positive reaction to the gravitropism that causes them to grow downward.

This is a very very simplified explaination of gravitropism. If you are interested in more information run searches on google and yahoo.

Answer 2

I think maybe the question you want to know about is "How do trees grow upwards, away from gravity?" because the why question is more or less obvious: they want light. (They need light because they use the light to help them make food through photosynthesis.)

I'm a little rusty from my days as a biology major, but I believe the current theory is that plant cells have tiny stones in them, made of calcium or some other mineral, that can move around in the cell, since it's essentially filled with water. Because of gravity, these stones move to the bottom of the cell, where they stimulate sensors that say, "Don't grow on this side." As a result, the other side continues growing, and the plant grows up.

I'm not sure that botanists feel they have the final answer to this question yet, so that's why I've given this as the current theory.

Happiness!

Answer 3

Because the tree's root's are underground. The roots produce a liquid that flows upward through the trunk, branches, and leaves.
The fluid is known as "Anti-Gravity Fluid" and was first discovered in 1823, at Roswell, New Mexico.

Answer 4

They grow upwards towards the sunlight

Answer 5

Due to negative geo tropism.

Shoot system is negatively geo tropic while root system is possitvely geo tropic.

A tropism is a biological phenomenon, indicating growth or turning movement of a biological organism, usually a plant, in response to an environmental stimulus(in this case, gravity)

Answer 6

They grew towards the sun, because they need sunlight to grow as sunlight gave off oxygen and carbon dioxide. They feed on carbon dioxide and gave out oxygen, which is one part of oxygen cycle.

Answer 7

They grow toward the light.

Answer 8

Towards the sun

Answer 9

trees grow upward because if they grew downwards they would not be growing. also trees grow downward to. if you count the roots.

Answer 10

they grow toward light but the roots grow down