test 2 Flashcards
(50 cards)
In the real world, many factors determine the number of organisms in any one population. Yet a superfly with unlimited food and no mortality would show what type of growth?
j-shaped growth curve
The demographic transition refers to a country’s change from…
high birth and death rates to low birth and death rates
Tundra biomes occur…
at high latitudes and altitudes, where the growing season is short
A population growing at 2.5% per year should double in about ___ years.
28
Widespread starvation is an example of ____ population control
density-dependent
Which of the following sequences is an example of exponential growth rate?
4,8,16,32
Carrying capacity is the population…
that an environment can support on a long-term basis
In a population whose mortality and natality are balanced, there are…
about the same number of old and young
Crude birth rates are measured in terms of children born…
per 1000 people each year
An “r-adapted” strategy of population growth includes a tendency for…
little parental care and protection, production of many small offspring that mature early, and organisms to have short lives and grow rapidly
Life expectancy is the…
number of years an individual of a certain age will probably live
Location of specific biomes can be predicted based on…
precipitation and temperature
The zero population growth rate in the more highly developed countries is ___ children.
2.1
Endocrine disruptors…
disrupt normal hormone functions
Teratogens cause abnormal growth specifically in…
embryos
If solubility is an important characteristic in toxic material movement in the environment and body, which of the following statements is true?
oil-soluble compounds accumulate in the body
Hazardous substances ___ while toxins are ____.
are dangerous substances; poisonous substances
Biomagnification is a concentration of toxins…
as predators consume and store toxins stored in the bodies of their prey
The difference between “total growth rate: and “natural increase” is that total growth rates…
include immigration and emigration as well as births and deaths
Highly persistent toxic chemicals…
retain their toxicity as they cycle through the food chain and environment
Historically, up until the middle ages, populations were mostly limited by…
disease, famine and war
Deciduous forests…
have trees that shed their leaves seasonally
In evaluating the interaction of two chemicals that have an adverse impact on a specific organism, the most serious detrimental chemical interaction would be described as…
synergistic
A dependency ratio is a comparison between the numbers of…
working and nonworking people
