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phloem precursor cell by a process known as asymmetric cell division.

Sieve tube member

Phloem Precursor Cell

Companion cell

3. Ground tissue system (storage, support, photosynthesis) Cells in the ground tissue systemperform a variety of functions including photosynthesis, storage and support. a. parenchyma cells Parenchyma cellsare closest to our "typical" plant cell. They make thin and flexible primary cell walls and perform most of the metabolic functions for the plant. They do not generally divide, but they retain the ability to do so. b. collenchyma cells Collenchyma cellsprovide support to growing regions of the plant. They are surrounded by thick primary cell walls. c. sclerenchyma cells Sclerenchyma cellsproduce thick secondary cell walls strengthened with lignin. In most cases, they are also dead at functional maturity. i. fibers Fiber cellsare long, thin, tapered cells found in the vascular bundles of angiosperms. They are the primary support cells of non-woody stems. ii. sclereids Sclereidsare irregularly shaped cells that are found throughout the plant for mechanical support.

V. Plant classification (monocot vs dicot) [FYI] Review: Campbell pp.693-694, Self-quiz and Challenge questions (Campbell, 4th, Ch. 35)

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