One way to kill a tree is to girdle it by cutting a groove a centimeter into the bark all around the trunk of the tree. The tree will typically survive that growing season, but will die over the winter. Which of the following is the best explanation for this observation?
A. The phloem was cut, so water and nutrients cannot be taken up to the leaves.
B. The xylem was cut, so sugars cannot be transported to the roots.
C. The phloem was cut, so sugars cannot be transported to the roots.
D. The xylem was cut, so water and nutrients cannot be taken up to the leaves.
E. The xylem was cut, which gives access to pathogens that kill the tree.
C. The phloem was cut, so sugars cannot be transported to the roots.
You might also like to view...
Refer to the figure. After the system reaches equilibrium, what changes are observed?
A) The molarity of sucrose is higher than that of glucose on side A. B) The water level is higher in side A than in side B. C) The water level is unchanged. D) The water level is higher in side B than in side A.
Leader sequences contain signals that:a
prevent enzymes from degrading the newly synthesized mRNA. b. inhibit ribosome binding until the appropriate time. c. initiate chain termination. d. allow the ribosomes to be properly positioned for translation of mRNA molecules. e. allow tRNA molecules to successfully bind to mRNA.
Certain traits that allow pathogens to create infection and cause disease are termed
A) hyaluronidases. B) streptokinases. C) virulence factors. D) collagenases.
The main function of the hindgut in the grasshopper is to
A) reabsorb water and compact wastes. B) digest food. C) absorb nutrients. D) absorb vitamins and pulverize food.