Answer
d.
Work Step by Step
Option a. is incorrect. Cell walls provide an extra layer of protection for plant cells.
Option b. is incorrect. The phloem brings the product of photosynthesis, which is glucose, from the leaves to other parts of the plant for use or for storage.
Option c. is incorrect. The cuticle is a layer of wax that prevents water loss from the plant.
Option d. is correct. The xylem transports water from the roots up to the leaves where it will be used in photosynthesis.
