Exercise 10: The Plant Cell

Cell Wall Structure

the thinner thinner cell wall is called the→primary cell wall.

Secondary cell walls←These walls are thick due to lignin deposition within the primary walls.

Suberin←a waxy substance deposited within the cellulose fibers, that may add to the thickness of walls in certain cells and impermeability of secondary walls (e.g., cork cells).

x-s solereids Achras zapota→irregularly thick secondary walls

x-s bast fibers→very thick lignified secondary walls

x-s root Iris germanica→Casparian strip

Radial section stems Elm (Ulmus americana)→pits where plasmodesmata are found

Cytoplasm, Organelles, Inclusions

What plant in this exercise is observed to do cyclosis or cytoplasmic streaming→Hydrilla

cyclosis or cytoplasmic streaming→The movement of cytoplasm and organelles within a cell.

starch grain←develops within the colorless plastid, the leucoplast.

chromoplasts←orange or reddish sturctures in the cytoplasm tomato (Lycopersicon esculentum)

plastids→Organelles found in plant cells that are responsible for photosynthesis, storage, and pigment production.

x-s cotyledon Phaseolus or Zea mays→leucoplasts

x-s root Ranunculus sp.→amyloplasts

I-s root tip Zea mays→statoliths in statocysts

Calcium oxalate crystals→druse crystals

Impatiens parviflora leaf→raphide crystals

x-s midrib Ficus religiosa→cystoliths in lithocysts

Common Names of Plant Species

Onion→Allium cepa

Cells in potato→Solanum tuberosum

tomato→Lycopersicon esculentum

Cells in Avocado→Persea americana