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plant ecology midterm
Terms in this set (43)
mechanisms to promote outbreeding and prevent selfing include ...
dioecy- male and female flowers on different plants
monoecy- separate male and female flowers on the same plant
spatial separation- arrangement of male and female structures in one flower
the f is a pollination syndrome?
flower traits that have evolved in response to natural selection from abiotic and biotic pollinators
examples include flower shape, size, color, odor....
in what ecological conditions would asexual reproduction be more favorable than sexual reproduction?
a stable, unchanging environment would favor asexual reproduction because it ensures the success of the plant's offspring
of light, proper temperatures, water, CO2, and inorganic soil nutrients, which two of these are plants most likely to compete other plants for?
temperature and CO2
photoinhibition is a decrease in photosynthesis due to ...
excess light energy
the three photosynthetic pathways RuBP is found in ...
C3, C4, CAM
the relationship between temperature and respiration in plants is best described as ...
positive and exponential
photorespiration occurs when RuBP reacts with __________ instead of ______________
the ratio of water molecules out vs carbon dioxide in is ...
water comes out of plants way more than CO2 goes in because water has such a high ...
diffusion gradient and rate of diffusion
consequence of more frequent fires, increasing tall shrub cover, and warming in cold, northern places?
CO2 being released into the atmosphere from the soil
the soil that holds the most moisture is ...
the soil that holds the lest moisture is ...
the majority of water loss a plant experiences goes through its ...
a very small amount of water loss a plant experiences escapes through the ...
the two primary determinants of a plant's transpiration are ...
leaf conductance (resistance to flow) and the water vapor concentration gradient (from leaf to air)
an increase in air temperature will affect transpiration most in plants with what type of photosynthetic pathway?
when plants increase their temperature optima for photosynthesis over the course of the growing season as air temperatures increase, this is called ...
when assessing the energy budget of a plant, energy inputs to a leaf are about half&half from what two sources?
solar radiation and infrared radiation from its surroundings
the most important process a plant leaf experiences energy loss through is ...
re-radiation (IR radiation)
pros and cons of sexual reproduction
-takes a long time
-relies on two individuals, more things could go wrong
pros and cons of asexual reproduction
-lack of genetic diversity/ability to evolve
the three ingredients necessary for the storage effect are ...
1) species-specific responses to environmental conditions
2) covariance between environment and competition
3) buffered population growth
phosphorus rarely limits plant growth because of an often obligate, symbiotic relationship the plant has with ...
the second most abundant macro nutrient in plant leaves is ...
stoichiometric homeostasis occurs when leaves of plants maintain relatively constant __________ even when growing across a wide range of _______________
leaf nutrient ratios (N:P, C:N:P)
soil nutrient levels or amounts
the consequences evergreen species face in terms of low nitrogen levels are ...
low relative growth rate and photosynthetic rate
what abundant soil macro-nutrient do evergreen and deciduous species differ significantly in concentrations?
the most important abiotic factor that increases the leaf boundary layer is ...
decreased wind speed
the most important plant factor that increases the leaf boundary layer is ...
increased plant surface
what is the advantage gained when a water stressed grass rolls or folds its leaves?
less surface area to absorb sunlight and gain heat
under what conditions will convection result in no energy loss from the leaf, no matter the wind speed?
when Ψleaf = Ψair
a plant population is ...
a group of individuals (plants) of the same species that live together and reproduce
density-independent population growth is ...
growth is not reduced with increasing density of plants
simple equation of population growth & decline
dN/dt = B-D+I-E
reasons why population growth in plants is complicated include ...
-plants have both sexy and asexy reproduction
-birth/death rates vary considerably with size, age, life history, morphology
-populations are stage-structured
stage structure in plant populations means ...
differences between individuals in a population due to size, life history, age ,,,
how is stage structure incorporated in estimate of population growth?
life tables, matrix modules
λ is ...
population growth rate
if λ>1 ...
the population is increasing
if λ<1 ...
the population is decreasing
sensitivity analysis is ...
how an absolute change in a transition element causes an absolute change in population growth
elasticity analysis is ...
how a relative change in a transition element causes a relative change in population growth
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