L5: Dermal Tissue System Flashcards

1
Q

3 stages of cell growth

A

Cell division
Cell expansion
Cell differentiation

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2
Q

epidermis

A

covers the surface of all plant organs (produced by primary growth)

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3
Q

Diverse epidermal cell types

A

pavement cells
guard cells
trichomes
root hairs

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4
Q

Dermal tissue system

A

Outermost layer of cells that controls what goes in and what goes out and protects it from the environment

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5
Q

What is the dermal tissue system often covered by?

A

covered by a waxy, hydrophobic cuticle

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6
Q

Function of the plant cuticle

A

minimize water loss and prevent organ fusion
surface self-cleaning

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7
Q

What is the plant cuticle lotus effect?

A

Hydrophobic cuticle allows water droplets to bead on the plant’s surface and assists in removing debris (self cleaning)

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8
Q

Hypothesized function of the plant cuticle’s cuticular folds and ridges

A

prevent extended contact between different surfaces
create iridescence that attracts pollinators
help bugs attach, walk, and even guide towards desired features of the plant

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9
Q

periderm is the _________ epidermis

A

secondary

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10
Q

pavement epidermal cells

A

general protection and support
typically no chloroplasts (no photosynthesis)

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11
Q

guard cells

A

2 guard cells together that form pores in the plant’s epidermis that can open and close by turgor pressure

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12
Q

Guard cells function

A

control gas exchange

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13
Q

Where are guard cells most abundant

A

the bottom of a leaf

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14
Q

What are guard cells often flanked by to help regulate turgor

A

subsidiary cells

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15
Q

turgid (guard cells)

A

open

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16
Q

flaccid (guard cells)

17
Q

specialized features of the guard cell

A

thickened inner wall lining the pore/aperture
cellulose microfibrils are radially oriented

18
Q

Trichome

A

a unicellular or multicellular outgrowth of the epidermis on stems, leaves, or flowers

19
Q

Trichome functions

A

protection
limit water loss
protect from high sunlight by reflecting it
exude chemicals for defense or attraction

20
Q

non-glandular/non-secretory trichomes

A

often hair-like or spike-like trichomes that provide physical protection

21
Q

glandular/secretory trichomes

A

bulbous trichomes that produce secretions/oils that provide chemical protection

22
Q

2 root epidermal cell types

A

Hair cells (trichoblasts)
Non-hair cells (atrichoblasts)

23
Q

Hair cells (trichoblasts) function

A

absorb water and nutrients

24
Q

Non-hair cells (atrichoblasts) function

A

provide support and ensure space between hairs

25
types of primary meristems
protoderm ground meristem procambium
26
type of apical meristems
shoot and root
27
secondary (lateral) meristems
vascular cambium cork cambium
28
periderm
the secondary epidermis that is derived from the secondary meristem called cork cambium
29
periderm function
protection and control of water loss
30