Populations Terms and Definitions Chains, Webs & Pyramids Nutrient Cycles Pot Pourri
Name 2 things that can affect the population size in a given area?
Food Supply Number of Predators Disease Natural Disasters Habitat Destruction Climate Other?
Name the two methods of estimating populations that we used in class.
1.Quadrat Sampling 2.Capture/Recapture
In a given ecosystem, rabbits eat producers. rabbits are eaten mainly by wolves. If most of the wolves die off, what will happen to the population of rabbits?
The rabbit population will increase.
Define the term “carrying capacity”.
Carrying capacity is the maximum number of organisms that an area can support on an ongoing basis
Name the one of the two ecologists responsible for the ideas in the video “population bomb”
Paul Ehrlich Rachel Carson
Explain the difference between biotic factors and abiotic factors in an ecosystem
Biotic factors are factors associated with living things. Abiotic factors are factors associated with non-living things.
This is the food energy in an ecosystem. It has the chemical formula C 6 H 12 O 6
Glucose
Which 2 substances are created (given off) during cellular respiration?
Carbon dioxide and water.
This type of species is likely to become endangered if current trends are not reversed.
Threatened species.
Name the two types of indicators that can tell us about the health of the water supply in an ecosystem.
Chemical Indicators Biological Indicators
What is the difference between a food chain and a food web?
A food chain shows only one direct line of interactions between organisms. A food web shows multiple interactions between all the organisms in an ecosystem.
Which organism exists at the 3 rd trophic level in the following food chain? Algae Minnow Trout Bear
Trout
What is the source of all food in every ecosystem?
Plants (Producers)
If only 15% of the energy is transferred to each higher trophic level in a food chain, what happens to the rest of the energy?
The organism loses the rest for metabolism (moving, breathing) and waste.
Explain why the following biomass pyramid is not healthy.
There are not enough producers in this ecosystem. The population of primary consumers will be strained and diminish. The pattern will continue up the level, until balance is reached.
Name the two nutrient cycles we discussed in class.
Carbon Cycle Nitrogen Cycle
What is cellular respiration, and write its chemical formula.
Cellular respiration is the process by which animals turn food energy into carbon dioxide and water. C 6 H 12 O 6 +6O 2 6H 2 O + 6CO 2
What is photosynthesis, and write its chemical formula?
Photosynthesis is the process by which plants turn carbon dioxide and water into food and oxygen. 6H 2 O + 6CO 2 C 6 H 12 O 6 +6O 2
Name the process performed by bacteria that take nitrogen gas from the atmosphere and turns it into nitrates for use by plants
Nitrogen Fixation
Name two ways that humans have altered the carbon cycle, resulting in more CO 2 in the atmosphere.
Deforestation has reduced the number of plants and reduced the capacity of the planet to use CO 2 from the atmosphere. Increased use of fossil fuels has increased the level of CO 2 in the atmosphere leading to global warming.
Name 2 Canadian Biomes
Tundra Boreal Forest Temperate Deciduous Forest Grassland
What type of organism turns waste into nutrients for the soil?
De-Bach De-Mozart Decomposers!
Give two solutions to the “population bomb.
-Limit births - Education - Forced sterilization
25 trout from a pond are caught and tagged on one day. The following day, 50 trout are caught and 5 of them have tags. What is the estimated population of trout in the pond?
x = x = 250 trout
Two ‘flies’ require more than 6 ppm of oxygen to survive, and their presence indicates a healthy stream or river.
Stonefly Mayfly