Xylem vessels, found in angiosperms, have a much greater internal diameter than tracheids, the only xylem-conducting cells found in gymnosperms. The tallest living trees, redwoods, are gymnosperms. Which of the following is an advantage of tracheids over vessels for long-distance transport to great heights?
A) Adhesive forces are proportionally greater in narrower cylinders than in wider cylinders.
B) The smaller the diameter of the xylem, the more likely cavitation will occur.
C) Cohesive forces are greater in narrow tubes than in wide tubes of the same height.
D) Adhesive forces are proportionally greater in narrower cylinders than in wider cylinders, and cohesive forces are greater in narrow tubes than in wide tubes of the same height.
E) Adhesive forces are proportionally greater in narrower cylinders than in wider cylinders, and the smaller the diameter of the xylem, the more likely cavitation will occur.
Major types of microbial cell aggregations found in phylum Cyanobacteria.
Diverticulosis. Figure illustrates external and internal appearance of diverticula.
Internal structures of main sequence stars, convection zones with arrowed cycles and radiative zones
Some of the many small molecules found in cells
The features found in a long bone.
Vessels of the heart: Anterior