Sucrose is transported throughout plants in phloem tissue, as shown in the model. the varying concentrations of water and sucrose allow for the movement of both of these molecules through the plant. which explanation best describes the transport of sucrose in the plant? a) sucrose is moved into the companion cells and sieve tubes against its concentration by active transport. b) sucrose is moved into the companion cells along its concentration gradient by facilitated diffusion and then into the sieve tubes by osmosis. c) sucrose is moved into the companion cells against its concentration via active transport and then into the sieve tubes by facilitated diffusion. d) sucrose is moved into the companion cells along its concentration gradient by facilitated diffusion and then into the sieve tubes by simple diffusion.

A

Explanation:

Sucrose is actively transported AGAINST a concentration gradient into sieve-tube elements. Technically, the sieve-tube elements LACK (have no) NUCLEI but the adjacent companion cells do. Companion cells are CLOSELY ASSOCIATED with sieve tubes and ALSO CARRY OUT ALL THE CELLULAR FUNCTIONS of the sieve tubes as well.

It's C Sucrose is moved into the companion cells against its concentration via active transport and then into the sieve tubes by facilitated diffusion.

Explanation:

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.