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Biology 104 Unit 1 Exam with correct Answers
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Biology 104 Unit 1 Exam with correct Answers
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Biology 104 Unit 1 Exam with correctAnswers
Ecology - Answer -the study of the interactions of organisms with other organisms and
with the physical environment
habitat - Answer -the place where an organism exists
population - Answer -a group of the same species occupying a certain area
community - Answer -all populations at one locale (e.g., a coral reef population)
ecosystem - Answer -m contains the community organisms and abiotic factors
biosphere - Answer -the layer on the earth where living organisms can live
Demography - Answer -the statistical study of a population, e.g., its density, distribution,
rate of growth
population density - Answer -the number of individuals per unit area.
population distribution - Answer -the pattern of dispersal of individuals across an area
Resources - Answer -nonliving and living components of an environment that support
living organisms.
Limiting factors - Answer -those environmental aspects that particularly determine
where an organism lives.
Examples of Limiting Factors - Answer -Such factors include oxygen supply, light
availability, space, temperature, and precipitation amounts
Example of Biotic Factor - Answer -Biotic factors can be illustrated by red kangaroos
that are limited to inland Australia by the grasses that grow there.
terms used to describe patterns of distribution. - Answer -Clumped, random, and
uniform
, rate of natural increase (r) - Answer -dependent on the number of individuals born every
year and the number of individuals that die every year.
biotic potential - Answer -The highest possible rate of natural increase for a population
when resources are unlimited
Biotic potential depends on 4 things: - Answer -a. # of offspring per reproduction
b. Chances of survival until age of reproduction
c. How often each individual reproduces
d. Age at which reproduction begins
cohort - Answer -all members of a population born at the same time.
Survivorship - Answer -the probability of newborn individuals of a cohort surviving to
particular ages.
A survivorship curve is obtained by - Answer -plotting the number of individuals
surviving at each age, is characteristic of each species.
3 Age Distribution Groups: - Answer -prereproductive, reproductive, and
postreproductive
Age structure diagrams - Answer -used to determine past and future history of a
population.
The 2 Population Growth Models: - Answer -Exponential Growth & Logistic Growth
Exponential Growth - Answer -the number of individuals added each generation
increases as the total number of females increases.
Logistic Growth - Answer -When growth encounters environmental resistance
density-independent factors - Answer -Abiotic factors that regulate population.
(Tornados, hurricanes, tsunami, forest fires, etc...)
density-independent factors show ____ ____________ with the size of the population. -
Answer -no correlation
Predation, parasitism, and competition - Answer -considered density-dependent; the
more these organisms crowd together, the more damaging are the food shortages, the
parasites, and the predators
density-dependent factors have some effect relative to the ______ of the population. -
Answer -size
Populations vary on particulars such as: - Answer -Fecundity, Maturity, and Parity
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