Question

woody cells that make up the annual growth rings are actually ______. a. xylem cells b. cambium cells c. the pith d. inner bark

Explanation:

Annual growth rings in woody plants are formed by the xylem. Xylem is responsible for water transport. In each growing season, new xylem cells are produced. In spring, larger, thinner - walled xylem cells (spring wood) are formed, and in summer, smaller, thicker - walled xylem cells (summer wood). The difference between spring and summer wood in consecutive years creates the annual growth rings. Cambium cells are meristematic cells that produce xylem and phloem. The pith is the central part of the stem (usually soft and composed of parenchyma cells). The inner bark is mainly phloem which is responsible for food (sugar) transport.

Answer:

A. xylem cells