wood structures

Question 1

why are tree rings wider closer to center

Answer 1

costs more to add to diameter when bigger tree

Question 2

what type of cells is wood

Answer 2

parenchyma

Question 3

3 functions of wood

Answer 3

1. storage
2. support
3. transport

Question 4

cross section

Answer 4

-transferse
-over top of growth rings
-perpendicular to axis

Question 5

radial section

Answer 5

perpendicular to growth rings

Question 6

tengential

Answer 6

parallel to growth rings

Question 7

wood elements

Answer 7

axial wood elements
radial wood elements

Question 8

axial wood elements

Answer 8

tracheids and vessels
-up from roots to leaves

Question 9

radial wood elements

Answer 9

wood rays
-living cells
-transport from center to edges b/w growth rings and storageswhat

Question 10

transport and support in conifers

Answer 10

tracheids offer support and transport

Question 11

transport and support in angiosperm

Answer 11

-vessel elements transport and fibers support
-some angiosperm contain tracheids

Question 12

Resin duct

Answer 12

-conifers
-resin used to defend against pathogens and patches holes

Question 13

tracheid evolution

Answer 13

tracheids thought to have evolved to vessels and fibers in angiosperms

Question 14

What is contained in tracheids of conifers

Answer 14

torus margo pits

Question 15

torus margo pits

Answer 15

water moves through when torus in neutral,
when torus pushed to cover the aperature, no more water
margo: lil stringy mfs

Question 16

angiosperm has

Answer 16

vessels, rays, fibers
tracheids sometimes

Question 17

connifers have

Answer 17

tracheids, resin ducts

Question 18

Sapwood

Answer 18

-living parenchyma–storage cells
-living ray cells
-lighter

Question 19

heartwood

Answer 19

-dead parenchyma
-darker than sapwood
-clogged xylem
-dead ray cells

Question 20

what can cause the clogged xylem

Answer 20

tyloses–> outgrowth of living cells(parenchyma), penetrating vessels