They wouldn't
They cant, if the did they planet would fall apart, zero-gravity doesnt exist.
yes. It seems from the latest experiments plants to do not rely on gravity as much as was previously believed. see news. national geographic .com/ news/ 2012/ 121207- plants-grow-space-station-science/
There isn't a zero gravity environment, but if there was, planets wouldn't form. Planets form by very large rock all attracting to each other and gain enough energy that the center pulls the surrounding rock and smooths then into a sphere. So if a zero gravity environment existed. There would be no planets.
Seeds would not be able to root in soil, so the plant would not be able to germinate, or begin growing.
It looks like most plants need a gravity reference to "know" which way to grow their roots (down) and shoots (up). Near zero gravity has an affect on which way the roots and shoots grow. Here is an article from Colorado State University, which explores some of those effects.
A two-ton bus would have zero weight in zero gravity, since weight is dependent on the force of gravity. However, gravity has an infinite range, so gravity would only actually be zero at an infinite distance from the source of the gravity.
No
In classical physics, weight is the force exerted on an object due to gravity. If an object has zero mass, it would not experience weight as weight is proportional to mass. So, for a body to have zero weight, it would need to have zero mass.
In zero gravity, buoyancy would not be present as there is no gravity to create the force that causes objects to float in a fluid. Objects would not experience an apparent weight loss or loss of buoyancy in zero gravity.
In zero gravity, inertia would remain the same as in normal gravity. Inertia is a property of a body that causes it to resist changes in its motion, regardless of the presence or absence of gravity. Thus, objects in zero gravity would still exhibit the same resistance to changes in motion as they would in a gravitational environment.
Gravitation effect on a plant's growth is called geotropism. It affects it by it's height,and sometimes affects how many flowers it produces. It causes roots to grow downward (positive geotropism) and stems/branches to grow upward (negative geotropism). So it gives plants an 'up' and 'down' or lateral directions to grow the correct structures in the right places.
Zero! that's why it is called zero gravity!