What is the term used to describe why roots grow in the direction of earth's gravity pull

The specific term to characterized the downward growth of roots in response to earth’s gravity pull is called positive geotropism. The word geotropism was derived from two words, “geo” which means ground and “tropism” which describes a plant movement elicited by a gravitational stimulus.

In addition, the root cap makes the roots turn downward as they grow for they have specialized cells with sensors called statoliths that settle to the lowermost part of the root cap in response to the pull of gravity and help the cell multiply more rapidly in a downward direction.

idk what the options are but

these is a strong electrostatic attraction between the ions hence a lot of energy is needed to overcome this attraction

this is why the boiling points are so high

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.