Plant biology test

1) it is the early stages of development 2) they are found where new leaves appear

Secondary Xylem tissue

• 1) the central vascular cylinder,inside the cortex, of roots and stems of vascular plants.
• 2)

1) Lactifers specialized cells or ducts they are extensive branced networks lined with latex secreting cells. 2)found scattered thourhgout the xylem and phloem they secrete resin and found in gyosperms and some tropical flowering plants. 3) they are economically important for making things with rubber, latex and gum.

1) all tissues outside the VC. 2) usually contains alternating layers of crushed phloem and cork cells. 3) cork cells, secondary phloem, and first degree phloem.

in older vessels/tracheids an adjacent ray cell will grow into the vessel/tracheids through a pit and block off the cell.

1) they are specialized parenchyma cells to defense against pahogens. 2) In radial section they appear as lat sheets of cells. 3) they help with water storage, lateral conduction of water/sugars.

can tell you the age of the trees

earlywood and latewood

xylem and phloem