For Exam 3 Flashcards
What are 5 major functions of stems?
- Conduct water and minerals from root to leaves.
- Conduct nutrients and photosynthates (foods) from leaves to flowers and roots
- Provide aerial support
- Some modified for storage
- Some photosynthetic (ex. cactus)
Name 3 characteristics of Herbaceous stems and give examples of Monocots and Dicots for these.
- Green
- Fleshy
- Flexible
Monocots: most grasses, lilies, some orchids Dicots: Beans, mint, parsley, daisies
Name 4 characteristics of Woody stems. Give examples of Monocots and Dicots for these.
- Typically not photosynthetic
- Hard
- Inflexible
- May be adapted for gas exchange
Monocots: bamboo, palm
Dicots: apple, oak, hickory, birch, maple, magnolia
Name a & b
a. terminal bud
b. axillary bud
Name c & d
c. node
d. internode
Name e & f
e. lenticel
f. terminal bud scale scars
Name g & h
g. bundle scar
h. leaf scar
Compare the Vascular tissue arrangement for Monocot and Dicot stems.
Monocot: scattered
Dicot: ring
Compare the presence of pith in Monocot and Dicot stems.
Monocot: no pith
Dicot: has pith
Compare the presence of Cortex cells in Monocot and Dicot stems.
Monocot: has some (depends on species)
Dicot: has cortex cells
Name e
e. Epidermis
Name a, b & f
a. cholenchyma
b. parenchyma
f. cortex
Name g, h & i
g. phloem
h. vascular cambium
i. xylem
Name c
c. vascular bundle
Name d
d. pith
Name a
a. epidermis
Name b
b. parenchyma
conjunctive: filling in the spaces
no pith
no vascular cambium
no secondary growth
Name c
c. xylem
Name d
d. phloem
Name e
e. vascular bundles
What 3 things are produced during primary growth?
- Primary xylem
- Primary phloem
- the first vascular cambium cells
What is Secondary xylem and secondary phloem?
Xylem and phloem tissue produced as a result of vascular cambium activity.
Are primary xylem and primary phloem still present after secondary growth occurs?
yes
Describe the development of secondary xylem and secondary phloem in 3 steps.
- Vascular cambium cells divide and produce cells that become immature xylem and phloem cells, adding to the existing sylem and phloem tissue.
- Immature cells differentiate into their functional cell types.
- End result is an increase in xylem and phloem tissue volume. Vascular cambium cells will continue to divide to produce more cells to the inside (xylem) and outside (phloem).
What growth tissue stage(s) does this show?
Primary Growth
Name a & d
a. Epidermis
d. Vascular cambium
Name c & e
c. Primary phloem
e. Primary xylem
Name b & f
b. Cortex
f. Pith
What growth tissue stage(s) does this show?
What growth season is it in?
Primary and Secondary Growth
One growth season
Name g & n
g. Epidermis
n. Pith
Name h & k
h. Cork cambium (formation of)
k. Vascular cambium
Name i & j
i. Primary phloem
j. Secondary phloem
Name l & m
l. Secondary phloem
m. Primary xylem
How many growth seasons does this have?
Two
How many growth seasons does this have?
Three
What happens to the size of the vascular cambium ring as the new xylem and phloem cells are produced?
The size of the ring also expands.
Cambiel cells produce more cambiel cells.
This allows secondary growth to continue and can result in tremendously large stems.
Xylem and phloem accumulate over the course of years.
This contributes to the increase in diameter / density of stems.
What are a & b
- Ground parenchyma organize into the ____a_____ _____b_____.
- It also divides and produces cells perpendicular to the direction of primary growth.
- ______a_____ cells are produced to the exterior of the ______b_______.
______a______ will replace the epidermis.
- ______a_____ cells are produced to the exterior of the ______b_______.
- It also divides and produces cells perpendicular to the direction of primary growth.
a. Cork
b. Cambium
a. How do you determine the age of a tree?
b. How do you determine the life history of a tree?
c. Approximately how old is the oldest living tree?
a. Bore into a tree using an increment borer and take a sample, then count the rings on that sample.
b. Life history can be assessed by injury, environmental conditions, etc.
c. 4,800 years old: “Methuselah tree”, a Great Basin Bristlecone Pine in CA White Mountains.
Heartwood and Sapwood
a. Which of the two conducts water and minerals?
b. Which can decay?
a. Sapwood
b. Heartwood
Name the 3 parts of outer bark from outside to inside.
- Cork cells
- Cork cambium
- Cortex
Which part of the annual growth ring is the early growth and the late growth?
The early growth is the lighter, less compacted (closer to the inside).
The late growth is the darker, more compacted (closer the the outside).
What is the progressive increase in diameter and volume which involves cell division, elongation, and differentiation in a side to side direction?
Secondary Growth
What two lateral meristems contribute to secondary growth?
- Vascular cambium
- Cork cambium
What is the location and origin of the Vascular Cambium?
Location: between xylem and phloem tissues (not leaves)
Origin: generated during primary growth from procambium
What is the location and origin of the Cork Cambium?
Location: toward the perifery of the stem in cortex tissue
Origin: ground tissue, cortex parenchyma
What tissues are produced by the Vascular Cambium?
Secondary xylem and secondary phloem in a lateral direction.
What tissues are produced by the Cork Cambium?
Cork cells to the “outside”.
Will replace the epidermis.
Secondary growth is prominent in DICOTS only. Why?
Vascular tissues are in a ring like pattern - conducive to concentric growth (rings on rings on rings…).
The vascular cambium cells divide to produce ____a____ cells toward the interior of the stem and ____b____ cells toward the exterior of the stem.
a. Secondary Xylem
b. Secondary Phloem
Are the xylem and phloem cells closest to the vascular cambium newer or older?
Newer
What happens to the Primary Xylem after significant secondary growth occurs?
Primary Xylem: still present, may decay over time
What happens to the Primary Phloem after significant secondary growth?
Primary Phloem: outermost phloem still functional
What happens to the Pith after significant secondary growth?
Pith: diminishes over time, dies and decays
What happens to the Cortex after significant secondary growth?
Cortex: crushed or pushed to the outside, replaced with cork cells
What happens to the Epidermis after significant secondary growth occurs?
Epidermis: dies and is shed
What happens to the Vascular Cambium after significant secondary growth occurs?
Vascular Cambium: will expand with secondary growth
Define bark in terms of secondary growth.
2 types: inner (primary and secondary phloem), outer (periderm: cork cambiu, cork cells, any remaining cortex).
Phloem outward.
Define wood in terms of secondary growth.
Primary and secondary xylem, and any remaining pith.
Define Heartwood in terms of secondary growth.
Older secondary xylem.
Tanens make it darker.
Define sapwood in terms of secondary growth.
Functional xylem.
Younger and lighter in color.
What species are considered hardwoods?
angiosperms
What species are considered softwoods?
gymnosperms (don’t have vessel elements)
Define Growth Rings in terms of secondary growth.
Corresponds to one season of growth.
When does early growth (in growth rings) occur and why?
Spring / Summer
Resources typically widely available. Rainfall and lots of photosynthesis.
When does late growth (in growth rings) occur and why?
Fall / Winter
Growth slows due to less resource availability.
What is this?
Fungal Hyphae
What is this?
Zygomycetes
- Most commonly referred to as the sugar fungi or bread molds (not the only ones).
- Black bread mold is a typical model - Rhizopus stolonifer - it’s everywhere!
What is this?
Name some examples
Ascomycota (sac/cup fungi)
- Truffles, morels, yeasts, mildews, canned fruit fungi, wild fruit rots, insect parasites
- Most have distinctive inflected shapes that appear all over or are pitted.
What kind of fungi are these?
Name each.
Ascomycota (sac/cup fungi)
Morels (edible)
Peziza
What is this?
Chryphonetria parasitica - Chestnut blight
What is on this peach leaf?
Ascos as pathogens
Peach leaf curl fungus
What causes Dutch Elm Disease?
Ascos as pathogens
What is on this barley?
Ergot fungus (Ascos)
What are these?
a. A common Russula mushroom
b. Earth stars
c. A shelf or bracket fungus
What is this?
A common stinkhorn. The stench of the slimy mass of spores toward the tip attracts flies.
What is this?
Commercially manufactured mushrooms.
What is this?
Death angel mushroom - Poisonous
What is this?
Fly argaric mushroom - Poisonous
What is this?
“God’s flesh” mushroom - causes euphoria
Name 3 benefits of fungi
- Principal decomposers that keep organic nutrients cycling back to plants so they can grow
- Useful baking, brewing, cheese production
- Antibiotics
What is responsible for producing the blue color in blue-veined cheeses?
Penicillium
- Cheese: Blue, Gorganzola, Roquefort, Stilton
- Cheese put in vaults with fungi growing on the walls
- Fungi can form a tough rind around the milk product
Study the following, but don’t memorize
What are these?
Name a, b & c
Litchen body types
a. crustose
b. foliose
c. fruticose
Name 5 important things / benefits about Lichens.
What can be bad about them?
- Eaten by deer, reindeer and caribou
- Dyes extracted from them
- Used to make firbrous fabrics
- Decoration
- Good indicator of air quality because they don’t grow well in air pollution
- Can be corrosive: break down substrates on which they grow.
What is this?
Cyanobacteria
and different algal species
can form blooms.
- Blooms are potentially harmful to other species in the same habitat.
- Limit oxygen availability to other organisms.
- Some are toxin-producing organisms under certain conditions.
What are these?
Name A, B & C
Green Algae Morphologies
A. Volvox - hollow colonies
B. Micrasterias - unicellular with a constriction in the center - desmid
C. Pediastrum - colonial
What are these?
Name D & E
Green Algae Morphologies
D. Ulothrix - filamentous
E. Scenedesmus - colonial
What are these?
Study labeling
Some representative green algae
Spyrogira (watersilk)
Ribbon-like chloroplasts
What is this?
A single cell of the common desmid, Closterium
(green algae)
Chlorella: high oxygen production, edible, model for metabolism, Vitamin C, possible use in space travel