L9: Secondary Growth Intro Flashcards

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1
Q

Types of secondary (lateral) meristems

A

vascular cambium
cork cambium

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2
Q

what secondary tissue does vascular cambium produce

A

secondary xylem and phloem

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3
Q

what secondary tissue does cork cambium (phellogen) produce

A

periderm

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4
Q

primary tissues

A

formed by primary growth to increase length in herbaceous plants
cells are supplied by primary meristems

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5
Q

secondary tissue

A

formed by secondary growth to increase organ width in woody plants
cells are supplied by the secondary meristem

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6
Q

in what direction do initials produce cells in the lateral meristems

A

to the side in both directions

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7
Q

origin of cork cambium

A

de-differentiation of parenchyma or collenchyma in the outermost layer of the cortex in the stem

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8
Q

origin of the vascular cambium

A

from the procambium within each bundle and/or the parenchyma cells between vascular bundles

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9
Q

cork

A

specialized boundary tissue with air-filled cells that have suberized cell walls and are dead at maturity

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10
Q

phelloderm

A

living parenchyma

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11
Q

suberin

A

a waxy material located within the cell walls of cork cells that forms a protective barrier that is impermeable to water

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12
Q

lenticels

A

interruptions/intrusions in the cork layers that allow for gas exchange and transpiration to occur

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13
Q

vascular cambium

A

makes all secondary vascular tissues
generates secondary xylem to inside and phloem to the outside

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14
Q

how thick is the vascular cambium

A

1-3 cells thick

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15
Q

2 types of initials in the vascular cambium

A

fusiform initials and ray initials

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16
Q

fusiform initials

A

generates tracheary elements toward inside and sieve elements to the outside

17
Q

ray initials

A

generate xylem rays toward the inside and phloem rays to the outside

18
Q

is secondary phloem produced more than secondary xylem

A

no

19
Q
A