Secondary Growth

Question 1

conducting capacity

Answer 1

Flow of nutrients and water

Question 2

when is conducting capacity set

Answer 2

when portions of stem or roots mature

Question 3

What increases girth and width?

Answer 3

wood(secondary xylem), outerbark(periderm) inner bark(secondary phloem)

Question 4

what homologously evolved beweeen gymnosperms and angiosperms?

Answer 4

Cambia

Question 5

what does(sometimes) and doesnt do secondary growth?

Answer 5

all Angiosperms and most dicots, no ermns and monocots

Question 6

How does the cambium originate?

Answer 6

Needs vascular bundles arranged in ring so that fascicular and interfascicular cambiums can form–> cannot do this with monocots

Question 7

2 parts of vascular cambium

Answer 7

fascicular cambium(in between primary xylem and phloem)
interfascicular cambium ( in between vascular bundles)

Question 8

How does vascular cambium produce growth in thickness of stem?(4 steps)

Answer 8

1. Cambium divides to 2 cells and differenciates, one vascular one is meristematic 2.does same but for other vacscular tissue, fist vasc tissue expands 3. second vascular tissue expands

Question 9

4 stages of xylem development

Answer 9

1. cambium division 2. secondary cell wall
2. cell expantion 4. programmed death

Question 10

When do tree rings grow the most

Answer 10

when tree young and high production months

Question 11

what replaces epidermis in secondary growth?

Answer 11

Periderm

Question 12

what does periderm consist of ?

Answer 12

Cork cambium(phellogen), which produces cork (phellum) and phelloderm(sometiems)
-lenticels

Question 13

what are different layers of periderm

Answer 13

Cork(outer layer), cork cambium(middle), phelloderm (inner,sometimes)

Question 14

what in the periderm is involved in gas exchange

Answer 14

lenticels