True or False
Classifications
Food Webs and Chains
Dichotomous Keys
Yes or No
Extended Response
100
A herbivore is a producer organism.
False
100
What is a consumer?
An organism that depends on other organisms to obtain their energy/food. E.g. Zebra
100
What is a food chain?
A representation of the flow of nutrients and energy.
100
Is there more than one types of dichotomous key?
Yes, list and branched.
100
All introduced species become invasive species.
False.
100
Name an invasive species and 1 impact that it has had on its environment.
Answer will vary.
200
A herbivore is an organism that consumes only plants.
True
200
What is a producer?
Something that produces/makes its own energy/food. Eg. plants
200
What is a food web?
A collection of all food chains present in an ecosystem.
200
Is this a good dichotomous key? How do you know?
No, it uses subjective language (it is not specific enough).
200
If an organism is removed from an environment, there will be no effect on the remaining food web/chain.
False.
200
Name an invasive species and a control mechanism that may be used to reduce its impact on its environment.
Answers will vary.
300
Energy and matter are the same thing.
Energy - enters the food web from the sun, transfers up the food chain in one direction.
Matter - enters food webs from small molecules that are turned into bigger molecules and is continuously recycled by decomposers.
300
Explain what an apex predator is.
An apex predator is an organism with no natural predator.
300
What do arrows in a food chain and web mean? and what direction must they be pointing?
They show the direction that energy travels in a system.
They always point to the organism that does the eating/gains the energy.
300
What is missing in this dichotomous key?
A second branch from monsters.
300
Biotic factors are just as important as abiotic factors.
True
300
Are all control mechanisms good at only impacting the invasive species? Or can they impact the environment in other ways too? Explain.
Answers will vary.
400
An ecosystem needs both heterotrophs and autotrophs to become stable.
True.
400
How do you know if an organism is a secondary consumer?
The secondary consumers generally preys on at least one herbivore.
400
Is this food chain correct?
Sun > grasshopper > lizard > snake > decomposer?
If yes, how do you know?
If no, what is wrong with it?
There is no producer.
400
Identify this organism in the following dichotomous key. 
400
A dichotomous key must be able to organise all given organisms.
True
400
Why are we learning this unit?
So that we can analyse how the sustainable use of resources is relevant to how they cycle through earth systems.
500
Classification is not an everyday necessity.
False
500
Describe what an autotroph and heterotroph are.
Autotroph - makes its own nutrients to meet energy needs.
Heterotroph - consumes other organisms to gain energy to meet its needs.
500
What is wrong with this food web?
It is missing the apex predator.
500
Identify beetle D.
Ladea Elena
500
Food webs never change no matter the influence (change of season, temperature, etc).
False.
500
What is subjective language, and why does it impact the effectiveness of a dichotomous key?
It is not specific enough. Being non-specific allows the user to 'interpret' their own meaning and base a classification off of opinion rather than fact.