What is the advantage of using plants high in cellulose like sorghum and switchgrass instead of corn?

Ivan is looking at a cross section of a stem taken from a vascular plant. he sees two different types of vascular tissue: the xylem, which is closer to the center of the stem, and the phloem, located around the xylem, closer to the outside of the stem. how do these two structures work together in a living plant?

Is genetic diversity the same as genetic variation?

Plants need carbon dioxide from their environment to produce glucose during which stage of photosynthesis?