Exam 2 Flashcards
where do plants gets their mass
air and CO2
what organisms have the largest carbon mass
plants
what are the largest marine environment carbon producers
protists
what happens in the light dependent reactions of photsynthesis
capture and store solar energy in ATP and NADPH
h2o is split
how is water split during light dependent reactions
photolysis
how does oxygen leave the plant
via the stomata
what happens during the calvin cycle
atmospheric carbon is fixed to glucose
energy is stored in glucose
what enzyme is important in the calvin cycle
ribulose bisphosphate
what pathway is an adaption for a dry environment
C4 pathway
what are the steps in the C4 pathway
- carbon is fixed in mesophyll cells using PEP
- Processed and becomes 4 Carbon: oxaloacetate
- oxaloacetate is converted to malate in the bundle sheath cells
- malate is decarboxylated and CO2 enters the bundle sheath
what enzymes allow plants to avoid photorespiration using the C4 pathways
PEP
what happens to O2 levels when the stomata is closed? CO2?
increases
decreases
where does the calvin cycle happen
bundle sheath cells
what photosynthesis pathway is used in uber dry environments
CAM photosynthesis
do plants who use CAM photosynthesis have bundle sheath cells? how do they separate carbon fixation and the calvin cycle
no
temporal separation w/in the cell
what happens during nighttime in CAM photosynthesis plants
stomata are open and CO2 can enter
CO2 is stored as malic acid in vacuoles of mesophyll cells
what happens during daytime in CAM photosynthesis plants
stomata are closed
CO2 is released from malic acid and enters cytosol for photosynthesis
_____ grasses dominate tropical and subtropical grasslands, ____ grasses dominate in cooler temps, ____ plant dominate arid environments
C4
C3
CAM
__ plants increases as you move south
C4
how do stomata open (3 steps)
- K+ pumped into guard cell vacuole
- H2O enters vacuoles
- cells become turgid
how do stomata close (3 steps)
- K+ is pumped out of guard cells
- H2O flows out of cells
- cells became flaccid
what are the 3 functions of leaves
solar collector
CO2 absorption
transpiration
modified spines
stipules
what are the 2 leaf types
compound and simple
what are the two vein types found in plants and to which plant do the belong (ie dicot vs monocot)
netted in dicot
parallel in monocot
formed by hydrophobic cutin to maintain h20
cuticle
long & narrow cells without a lot of intracellular space
pallisade
what cells make up the mesophyll cells in monocots?
dicots
spongy
pallisade and spongy
what are the two mesophyll arrangements
horizontal
vertical
pallisade layer is always on top
horizontal leaf mesophyll arrangement
2 pallisade layers w/ spongy cells in the middle
vertical leaf mesophyll arrangement
How is the cutin in these environments:
dry environments
mesic environements
submerged
thick
medium
nonexistent
what are the 4 functions of trichomes
defense against herbivores
reflect light to cool leaf
decrease evaporation
capture prey
why are trichomes found on the bottoms of leaves sometimes
minimize total water loss
how are guard cells shaped in grasses
dumbells
how are guard cells normally shaped
kidney beans
Describe stomata arrangement:
- horizontal
- vertical
- floating horizontal
- aquatic
- found on lower surface
- lower and upper surface
- upper surface
- no stomata
what are the 4 functions of soil
anchors plants
medium for plant growth
provides h2o and minerals
habitat for symbionts
What type of rock is this:
formed through cooling and solidification of magma or lava
igneous rock
What type of rock is this:
forms when rock is subjected to high heat, high pressure, hot-mineral rich h2o, or combination
metamorphic rock
What type of rock is this:
formed by accumulation or deposition of small particles that cement in layers
sedimentary rock
igneous rock examples (2)
granite
basalt
metamorphic rock examples (2)
marble
slate
sedimentary rock examples (2)
sandstone
limestone
process that breaks down rock via glaciers, wind, rain, temperature and/or freeze-thaw cycle that leads to soil formation
weathering
what are four characteristics that define rocks
crystalline structure
impurities trapped in crystal matrix
elements released into soil solution
weathering
which organisms are the first to colonize bare rock
lichen
explain chemical weathering
plants respire and release CO2 and water (carbonic acid) which breaks down rocks which alters soil chemistry
smallest size particle that has a negative charge
clay
largest size soil particle
sand
middle sized soil particle
silt
what kind of ions does clay attract and are the weakly or strongly bonded
cations
weakly
are there a lot of anions in the soil
why
no
washed away by the rain
Which horizon is this:
fallen leaves (litter)
few centimetres thick
O horizon
Which horizon is this: topsoil 10-30 cm thick 10-15 organic material dark soil
A horizon
Which horizon is this: subsoil 30-60 cm thick little organic material light colored soil accumulated minerals
B horizon
Which horizon is this:
extends to bedrock
lacks organic material
partially/unaltered rock fragments
C horizon
in which horizon do plants grow best
why
C horizon
lots of minerals and good source of h2o
what are the 5 soil components
which accounts for the lgst portion of soil
mineral particles, air, water, humus, living organisms
mineral particles
large spaces
rapid gas diffusion
holds water poorly
sand
small spaces
poor gas diffusion
holds water in capillary spaces
clay
what is the best soil type because it is an equal mix of sand, clay, and silt
loam
decaying organic material
humus
what are the four functions of humus
increase water holding capacity
increases cation exchange capacity
aerates the soil
reservoir of nutrients
does humus have a positive or negative charge
negative
how is humus replenished
leaf litter in the O horizon
animal waste
how is water found in nature (2 forms)
which do plants prefer
chemically bound & unbound
unbound
water locked into mineral crystals
hydrated to surface of clay-dry soil
chemically bound
dissolved nutrients
unbound
how is water held in place
adhesion and cohesion
what happens to water in macropore space
micropore?
water drains away
goes to plants
which organism is known to mix, aerate, and refine soil
earthworms
what are 5 ways living organisms effect soil
mix, aerate, refine soil add humus to soil add CO2 through respiration affect nutrient availability make soil inhospitable
what is the result of adding CO2 to soil
lower pH and increase nutrient availability
liberate phosphate from mineral particles
phosphotases
inhibit plant growth
terpenoids
release of allelochemicals that can have a positive or negative effect on other organisms in terms of growth, germination, survival, and/or reproduction
allelopathy
what are the 2 types of nutrients and in what quantities are they needed
macro -lg amts
micro- sm amts
what are some of the known macronutrients
nitrogen potassium calcium phosphorous magnesium sulphur
what 2 macro nutrients make chlorophyl
magnesium
nitrogen
list micronutrients
iron
chlorine
copper
boron
why does farmed soil need fertilizer
to replace minerals lost from leaching and crop production
larger than typical bacteria gram negative mucilaginous sheath closed loop DNA extensive thylakoid system lack flagella
cyanobacteria
how do cyanobacteria stay afloat
buoyancy vesicles
what are three cellular makeups of cyanobacteria
unicellular
colonial
filamentous
how do cyanobacteria move
using pili along polysaccharide tracks
how do cyanobacteria reproduce
is there spindle formation
asexually via binary fission
no
how do cyanobacteria deal with environmental stress
forming spores
thick walled spores resistant to desiccation and freezing
akinetes
which organisms were the first to split h2o and release O2
cyanobacteria
what element most abundant in the atmosphere?
is it available to plants? why?
nitrogen
no because very little is available for use in soil and water
is nitrogen inert
how money bonds does it have
how much energy is required to break this bond
yes
three
a lot
what three products all contain nitrogen
proteins
nucleic acids
chlorophyll
what do yellow leaves mean
low nitrogen in the soil
can animals use ammonia and ammonium
where do they get their nitrogen
no
protein
where do we get essential amino acids
nonessential amino acids?
from diet
we make ourselves
what is the best combination of plants to eat if you don’t eat meat
legumes and grains
what three ways to plants get nitrogen
soil
symbionts
eating insects
what symbionts help plants access nitrogen
what enzyme do they use
cyanobacteria & rhizobia
nitrogenase
what organelles found in cyanobacteria are used for ammonium fixation in ammonium lacking environments
heterocysts
polymer of aspartic acid and one molecule of arginine found in cytoplasm
cyanophycin granules
can cyanophycin be depolymerized
yes
what type of symbiosis exists between cyanobacteria and plants
mutualism
what cyanobacteria and plant have a known mutualistic relationship
anabaena azollae and azolla
what organism is used as green manure to fertilize rice fields with nitrogen
azolla (fern)
what accessory pigments are found in prochlorobacteria
chlorophyll b and carotenoids
prochlorobacteria are considered ancestors of plant chloroplasts because they share pigment characteristics
true
in what organism were prochloron first found in
sea squirt
what is the study of fungi
mycology
when did fungi split from plants
1.6 billion years ago
what fungi was dominant during the late silurian period that are now extinct
prototaxites
what domain are fungi in
eukarya
export hydrolytic enzymes to break down biopolymers for absorption
non motile bodies
non motile spores
cell wall made of chitin and glucans
fungi
what are the 5 fungi phyla
basidiomycota ascomycota glomeromycota zygomycota chytridomycota
what does the greek word askos mean?
mykes?
sac
mushroom
sac fungi 75% of described fungi multicellular and unicellular filamentous hyphae septate haploid
ascomycota
body of the fungus
myecelium
do fungi have female and male strains?
what are the strains
are they monokaryotic or dikaryotic
no
positive and negative
monokaryotic
what is the fruiting body of the ascomycota called
is it monokaryotic or dikaryotic
ascocarp
both
where is the zygote formed in ascomycota
asci
what are four examples of ascomycota
morchella esculenta
truffles
yeast
penicillin
what does the greek word basidion mean
base or pedestal
known as club fungi
multicellular and unicellular
filamentous hyphae
haploid
basidiomycota
which three phyla are sister taxa
basidiomycota
glomeromycota
ascomycota
what is the fruiting body of a basidiomycota
basisiocarp
mushroom
Define these terms: gondwana agarikon ites magnificus
ancient supercontinent
mushroom
fossil
magnificent
what species is the oldest phylum mushroom from
basidiomycota
what are the 3 parts of a mushroom
stalk
gills
pileus
what type of insect does phallus rubicundus attract and why
attracts flies
smells like rotting flesh
are lion’s mane mushroom edible
yes
what three mushrooms arise from agaricus bisporus
button
cremini
portobello
which phylum of fungi is an obligate symbiotic fungi that reproduces asexually with multinucleate glomerospores
glomeromycota
arbuscular mycorrhizae
colonize/ grow within plant roots
which two fungi phylum have non-septate hyphae
glomeromycota
zygomycota
when was the ordovician period
484.4 million years ago
what do plants provide fungus in a symbiotic rel.
fungi to plants?
sugars/carbon
phosphate
tree shaped extension with a large surface area necessary for efficient nutrient exchange
arbuscles
what are the storage organs in root cells called
vesicular arbuscular mycorrhizae
how do fungi grow inside of plants
penetrate roots cells cortex but not the cell membrane
which glomeromycota forms a relationship with cyanobacteria Nostoc instead of a plant
geosiphon pyriformis
why is there a symbiotic relationship between cyanobacteria and glomeromycota
phosphate limitation
which plant from the early Devonian period had no roots or leaves and only rhizoids and was considered a sporocyte
aglaophyton
what does the greek word zygon mean
yoke
are the spores of fungi motile
No except for chytidiomycota
rhizopus stolonifer (black bread mold) is an example of the fungi phylum ______
zygomycota
what does the greek word chytridion mean
little pot
has flagella
mainly aquatic
cell wall is chitin and cellulose
can be parasitic
chytridiomycota
what is chytridiomycosis of amphibians
skin disease that causes skin dysfunction by fungi called BD