Plant Diversity
Conducts water and minerals from roots to the rest of the plant
xylem
Plant that provides salicin, the original source of aspirin:
white willow
The number of organisms in a population per unit of space is the
density
Two factors that provide stability in biological communities are genetic diversity and
species redundancy in functional roles
Elephants, beavers, kangaroo rats, and prairie dogs alter habitats in a way that supports other species and are therefore known as
keystone modifiers
The loss of water vapor from leaves caused by dry air outside the plant is
transpiration
Plant that produces tetrahydrocannabinol (THC) which reduces sperm count crosses the placenta, and interferes with short term memory:
marijuana
Population increase without limits exemplified by the pattern of human population growth is
exponential
Trophic levels in food webs include primary producers, herbivores, omnivores, detritivores, and
carnivores
Successful experience with a particular prey item that allows predators to focus on specific prey is known as a
search image
The two plant groups that must remain near water for reproduction are:
mosses and ferns
The active compound in Mormon tea that is used as a decongestant
ephedrine
Logistic growth is the pattern exhibited when increasing density slows growth as the population approaches the
carrying capacity
The rate of energy transfer between trophic levels is approximately
10%
The loss of apex predators from a food web that allows an increase intermediate level predators is known as
mesopredator release
Plants with large, showy flowers that expend energy into flower production will be pollinated by:
animals
Source of urushiol, which bonds to proteins on skin causing an allergic reaction
poison ivy
Fragmented populations connected through corridors such that gene flow still occurs are known as
metapopulations
Species whose loss or removal have large effects on the diversity and structure of the biotic community are known as
keystone species
Species interactions in which both organisms benefit are called
mutualisms
The plant structure that holds pollen is the:
anther
Depressant produced by the poppy that dulls the perception of pain
morphine
Density dependent factors that affect population growth rates include competition, predator aggregation, and
crowding
Predator mediated competition demonstrated by overgrowth of mussels in intertidal communities was by removal of
sea stars
The low fertility and heart abnormalities exhibited by Florida panthers are due to
inbreeding