Unit B Flashcards
A Muskeg has *what* which keeps the soil from melting?
Permafrost.
In a taiga, what is the difference between Canopy and the Forest floor?
Canopy has the most sunlight and the forest floor is dark.
What part of a lake is the Limnetic Zone?
The middle zone between the Littoral Zone and the Profundal Zone. There is open water and enough sunlight for photosynthesis.
What is the difference between Grassland and Deciduous Forest?
Deciduous Forest has more precipitation than Grasslands.
What is a factor affecting aquatic systems?
Water pressure
What affects temperature and sunlight?
Seasons, water depth, hydrothermal vents
What’s the magic tempurature change number with the seasonal variations?
4*C
Surface water cools to 4*C and then what happens to O2?
O2 sinks down to the bottom.
BP-Birth potential, C-Capacity for survival, BF-Breeding frequency, M-Maturity
Larger mammals generally live longer than normal ones
C
BP-Birth potential, C-Capacity for survival, BF-Breeding frequency, M-Maturity
Pregnant female elephants carry their young for nearly 18 months.
BF
BP-Birth potential, C-Capacity for survival, BF-Breeding frequency, M-Maturity
Mice often produce litters of 6 or more
BP
BP-Birth potential, C-Capacity for survival, BF-Breeding frequency, M-Maturity
After about 6 weeks, mice reach sexual maturity
M
What is oligotrophic?
A deep, cold lake.
What is eutrophic?
A shallow, warm lake.
What is Taxonomy?
The science of classifying organisms.
Name the seven levels of classification in order.
Kingdom
Phyla
Class
Order
Family
Genus
Species
What is Phylogeny?
The hystory of the evolution of a species.
What is a Dichotomous Key?
A two-part key used to identify living things.
What is Paleontology?
The study of fossils.
How does Radiometric dating tell scientists the age of rock or fossil?
It changes a particular atom into a daughter isotope of the same or a different element
What is an endemic?
A species found in one location only.
What is a homologous feature?
Feature with a similar structure, but a different funtion
What is a vestigial feature?
May have served a useful funtion once but not anymore.
What was Buffon’s theory about evolution?
Species could change over time and these changes could lead to new organisms
What was Linnaeus’s theory about evolution?
Thought that only a few species could reproduce
What was Erasmus Darwin’s theory about evolution?
All life developed from a single source
What was Lamarck’s theory?
Believed in Spontaneous generation, and inheritance of aquired traits. (That if a mother lost her arm, the baby would be born without an arm)
What was Darwin’s Theory of Natural Selection?
Stronger individuals are better adapted to survive than weaker ones, over time species inherit traits that gives that species a survival advantage
What is a similarity between Lamarck and Darwin’s theory?
They both knew that the encironment played an important role in evolution
What is the two theories for Rate of Evolution?
Theory of Gradualism:
Idea that speciation takes place slowly
Theory of Puntuated Equilibrium:
Idea that species evolves rapidly, followed by a period of little or no change
