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.

rain is the best answer

1: most common garden plants prefer loam — soils with a balance of different-sized mineral particles (approximately 40% sand, 40% silt, and 20% clay) with ample organic matter and pore space. however, some plants grow better in sandy soils, while others are well-adapted to clay soils.

2: available water capacity is the maximum amount of plant available water a soil can provide. it is an indicator of a soil's ability to retain water and make it sufficiently available for plant use. available water capacity is the water held in soil between its field capacity and permanent wilting point.

3: it is the same for all living things (plants and animals). it also includes very tiny organisms that our eyes cannot see. they are known as microorganisms, and include viruses, bacteria and fungi.