Secondary Growth Flashcards

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1
Q

What is secondary growth?

A

produces wood and cork to increase girth

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2
Q

What is secondary tissue?

A

derived from lateral meristem called vascular cambium

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3
Q

What does the vascular cambium produce?

A

secondary xylem called wood

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4
Q

What is the cork cambium?

A

produces bark tissues which replaces the epidermis in stem and root

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5
Q

Where does newer vascular tissue develop?

A

xylem on the inner, phloem on the outer of the vascular cambium, at the top part of the tree

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6
Q

Where is the oldest tissue?

A

furthest away from the cambium, in the core or the primary epidermis and ground tissue

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7
Q

WHen did woody plants evolve?

A
  1. lepidodentron- lycophyte
  2. horsetail/ tree ferns- ferns
  3. lignophyte- gymonsperm and angiosperm
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8
Q

Why is the older tissue at the base?

A

primary growth

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9
Q

Why is there secondary xylem at the base, but not at the top?

A

because they have more time to develop, creating a thicker base.

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10
Q

When does secondary growth stop?

A

when cambium breaks as it pushes outward

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11
Q

Three ways to cut wood

A

cross section
radial
tangential

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12
Q

How is cross-section cut?

A

(cutting it through the side to see the annular rings) (wood will have annular rings)

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13
Q

How is radial cut?

A

(cutting from the center going down) (wood will have straight lines)

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14
Q

How is tangential cut?

A

(vertical going down, but not through the center) (wood pattern is oval, due to the base being wider, and the tissues growing on a slant

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15
Q

What are wood rays?

A

group of parenchyma cells that radiate across the stem from the center

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16
Q

WHat is uniseriate rays?

A

one line of cells

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17
Q

What is multiseriate rays?

A

multiple lines of cells

18
Q

Where are ray cells formed?

A

vascular cambium

19
Q

What are ray initials?

A

Cambium that form into rays

20
Q

What are fusiform intials?

A

cambium that forms vascular tissue

21
Q

WHat is periclinal division?

A

cambium dividing to add xylem, longitudinally and radially. Ray intials form this way, but are short and cuboidal.

22
Q

What is anticlinal division?

A

cambium formation to increase parameter of cambium

23
Q

What do wood cells include?

A

secondary xylem, rays, fiber, xylem parenchyma, laticifers, resin, and gum duct epithelial cells

24
Q

What is hardwood?

A

harder texture because of secondary growth tough with many fibers, vessels present, angiosperm

25
Q

What is softwood?

A

lack of fibers, absent vessels, gymnosperm

26
Q

What is heartwood?

A

darker, heavier, tylosis (the process of filling dead xylem and phloem to prevent possible invaders)

27
Q

What is sapwood?

A

lighter in color and weight, living cells

28
Q

What is early wood?

A

spring wood, big cavity, thin walls

29
Q

What is late wood?

A

summer wood, small cavity, thick walls

30
Q

Where is cork cambium found?

A

around and outside the primary phloem, outside the vascular cambium

31
Q

What is lenticel?

A

crack in the epidermis as the tree grows wider

32
Q

What is the cortex?

A

Develops from the primary growth, activating the cork cambium as it expands

33
Q

What does the cork cambium do when activated?

A

produces cork cells to fill cracks and spaces as the epidermis breaks.

34
Q

What direction does cork cambium add to?

A

outerside

35
Q

What is the outerbark?

A

outside the cork cambium,
falls off naturally

36
Q

What is the inner bark?

A

cork to vascular cambium, majority is phloem

37
Q

What is anomalous/tertiary growth?

A

growth creating unusual patterns, like clusters of xylems with multiple vascular cambiusm

38
Q

What is the order of the stem?

A

pith
primary xylem
secondary xylem
vascular cambium
secondary phloem
fiber
primary phloem
cortex
cork
epidermis

39
Q

How does a tree grow taller?

A
  • taller through primary growth of the apical meristem
    • the roots and shoots elongate thanks to plant hormones like auxins
40
Q

How does a tree grow wider?

A

secondary growth through cambium division