Chlorophyll is found in plant leaves and absorbs light from the sun to enable plants to perform photosynthesis. magnesium is an important component of chlorophyll. the concentration of magnesium ions is higher in the root-hair cells of plants than in the soil. which mechanism of ion uptake would best enable a plant to produce a steady supply of chlorophyll?
osmosis
diffusion
passive transport
active transport

Answer is active transport. Plants use active transport during the ion uptake.

Explanation:

In the process of active transport, substances are moved from an area where they are in lower concentration to a region where they are in higher concentration (against a concentration gradient). The concentration of minerals like magnesium ions is higher in the root-hair cells of plants than in the soil. So the plants take in the ions they need from the soil by the active transport across the root hair cells. This process requires energy which is supplied in the form of ATP (adenosine triphosphate).

answer and explanation;

volcanic rocks are igneous rocks which form from lava, molten rock which has been thrust out of a volcano onto the surface of a rocky body such as an asteroid, planet, or dwarf planet.  

plutonic rocks are igneous rocks which form from subterranean chambers of molten rock or magma. plutonic rocks make up the base of continental crust as well as oceanic crust. their slow rate of formation causes them to be coarse grained since there is plenty of time for large crystals to form before the magma solidifies into rock.

the textural difference is that plutonic rocks are more coarse grained than volcanic rocks. plutonic rocks are coarse grained while volcanic are fine grained ; glassey or fragmental. since fine and coarse are adjectives the decision as to whether a rock is fine or coarse grained is generally made on the bases of whether or not the individual crystals can be seen in most if the rock.