OC MIDTERM IMPORTANTE Flashcards
Hypothesis
A possible explanation for a set of observations that must be tested
How can you tell if a human population has passed through the demographic transition?
Birthrates and death rates are nearly equal
How can you tell if a human population has passed through the demographic transition? second reason
The age structure shows roughly equal proportions
How could a drought reduce the carrying capacity of an environment for a predator?
Drought kills plants prey eat, they starve so their predators starve
Hunters kill all of the wolves in a region, wolves ate deer. Why are there fewer deer years after the wolves are killed?
The deer population would increase rapidly due to a lack of predators; It would then fall as the deer ran out of food or diseases spread.
A species introduced in an environment with plentiful resources & few predators. graph of its population at first looks
a J-shaped curve; it’s called exponential growth.
How does nutrient availability relate to productivity and species survival?
Living things grow & reproduce when they have allthe nutrients they need.
How does nutrient availability relate to productivity and species survival? second answer
supply of least-available nutrients determines max population the species
Describe two ways that primary producers produce high-energy compounds
Photosynthesis use energy from sunlight Chemosynthesis use chemical energy.
How does energy flow through ecosystems
in feeding relationships from producers through series of consumers.
What factors describe aquatic ecosystems?
salinity, depth, temperature, flow rate, concentrations of dissolved nutrients
What abiotic factors distinguish different biomes?
latitude, elevation, temperature, rainfall or precipitation, soils, fires
What is climate
Climate describes temperature and precipitation in ecosystems over time
how does climate change affect ecosystems
Changes in climate can adversely affect the ability of organisms to survive
How do models help ecologists understand global systems?
Models show how changes in one global system affect other global systems.
How does the structure of water contribute to its unique properties?
Water is a polar molecule and can form multiple hydrogen bonds.
How does the structure of water contribute to its unique properties? second answer
hydrogen bonds These are not as strong as ionic or covalent bonds
hydrogen bonds These are not as strong as ionic or covalent bonds
it cannot carry out any functions of a living organism without a host.
group of scientists post their research results on Internet instead of publishing in a scientific journal, what skipped?
They skipped peer review.
grows tomatoes in greenhouses that differ only in @ CO2 , compares lb of tomatoes in unaltered air, is this controlled?
YES tomatoes in unaltered air are controls for tomatoes in different CO2
How do enzymes play a role in living things, and what affects their function?
Enzymes speed up chemical reactions that take place in cells.; pH, temperature, concentration
Enzymes speed up chemical reactions that take place in cells because
they are proteins that act as biological catalysts.
A centiped that is 6 centimeters long is about _________millimeters long
60 millimeters long
the bottle holds 1 ___________________of water which weighs 1 kilogram
1 Liter of water.
Samir drinks half of the bottle of water, it now has ______milliliters of water.
500 milliliters of water.
500 milliliters of water weighs about 500__________________
500 grams
What kind of chemical bonds holds the water molecule together?
covalent
What particles are shared between the atoms in the molecule___________?
electrons
