Problem
Leaf Structure:
1) Annotate a diagram to explain the two layers of inner tissue on the leaf: palisade mesophyll and spongy mesophyll.
2) Explain how guard cells open or close the stoma. Include a diagram
3) Explain the decrease in pressure and the transpiration pull that results from evaporation of water from the leaf.
Adaptations page:
1) Define and list characteristics xerophyte and halophyte.
2) Outline strategies used by xerophytes and halophytes to reduce water loss.
Phloem page:
1) Define translocation, phloem sap, source and sink. List examples of source/sink.
2) Source tissue: provide an annotated diagram for source tissue:
a) Why sucrose is used for phloem transport instead of glucose
b) Describe active transport of sucrose into phloem via co-transport protein
c) Explain phloem loading
d) State phloem becomes hypertonic to xylem due to active transport of sucrose into phloem
e) State water moves into phloem by osmosis
f) Outline why pressure in phloem increases due to the movement of water into phloem
g) Explain phloem unloading in sink tissue
h) Water rejoins transpiration stream
i) State that water moves from high to low pressure and movement of water moves solutes dissolved in it
j) Removal of water decreases pressure
k) Sucrose moved into sink cells, converted to starch or back to glucose
Xylem v Phloem
1) Compare and contrast xylem and phloem include:
a) Process
b) Materials
c) Transport
d) Composition
e) Structure
f) Location,