Populations
Photosynthesis
Energy Roles
Vocabulary
Mixed Bag
100
These are the four methods of determining population size.
What are direct observation, indirect observation, sampling, and mark and recapture.
100
What are the three things needed in order for photosynthesis to occur?
Sunlight, water, carbon dioxide
100
Name the three energy roles that organisms fill in an ecosystem.
producers, consumers, and decomposers
100
Define population density.
The number of individuals in an area of a specific size.
100
What is an herbivore and provide two examples.
An herbivore is a plant eater.
200
Name two ways organisms join a population and two ways organisms leave a population.
Birth, immigration, death, and emigration
200
What are the pores on the under side of a leaf called?
STOMATA!! (in an Italian accent!)
200
Explain how organisms in each of the three energy roles obtain energy.
Producers use sunlight to make their own food. Consumers eat other organisms. Decomposers break down organisms wastes and remains.
200
Define limiting factor.
An environmental factor that causes the population to decrease.
200
What is an omnivore? Give two examples.
An omnivore eats both plants and meat.
300
Name 3 limiting factors for an ant population and describe how one could limit the population.
Food, water, space, weather.
300
What is the food called that the plant makes for itself? What is the byproduct that is given off?
The food is called glucose (sugar). The byproduct is oxygen.
300
Identify the energy roles of the following organisms in a pond ecosystem: tadpole, algae, and heron.
Tadpole - consumer Algae - producer Heron - consumer
300
Define carrying capacity.
The largest population that an area can support.
300
What is a scavenger? Give two examples.
A carnivore that feeds on the bodies of dead remains.
400
What might cause the rabbit population in Branford to emigrate? Name two possibilities.
Snake population increased; population of hawks increased
400
What is the plural of stomata?
Stoma
400
What is the difference between a food chain and a food web?
A food web is many food chains that overlap and it is a more realistic way of portraying an ecosystem than a food chain.
400
Define consumer.
An organism that obtains energy by feeding on another organism.
400
Draw a food chain that would be found in a pond ecosystem.
Answers will vary.
500
What are the two population statement?
If the birth rate is greater than the death rate, population will increase. If the death rate is greater than the birth rate, population will decrease.
500
If you break down the term "photosynthesis" what does each part of the word mean?
Putting together with the help of light.
500
Describe specifically how the amount of energy at one level of an energy pyramid compares to the amount of energy available at the next level up.
As you move up in energy levels, there is less energy available because 90% is used for life processes and 10% is passed on as energy.
500
Define decomposer.
Organisms that break down the waste of dead organisms and return the nutrients back into the soil.
500
Why are producers the start of the food chain?
Because they make their own food.
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