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IB ESS 2.1-2.4 TEST 2023/ 74 Questions and Answers/ Verified.
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IB ESS 2.1-2.4 TEST 2023/ 74 Questions andAnswers/ Verified.
What does biotic mean? - - it refers to the living components within an ecosystem
-What does abiotic mean? - - It refers to the non-living factors of the ecosystem.
-What are producers? - - They support the ecosystem by producing new biological
matter (biomass).
-What are consumers? - - They are organisms tat cannot make their own food, and eat
other organisms to obtain energy and matter.
-What does trophic level mean? - - It refers to the feeding level within a food chain.
-What are decomposers? - - They feed on the dead biomass created by the ecosystem.
-What are the primary consumers? - - Herbivores
-What are the secondary consumers? - - Carnivores
-What are the tertiary consumers? - - they are the top carnivores.
-What is the order of a food web in terms of types of organisms? - - 1. Producer
(autotroph)-------> 2. primary consumer (herbivore)-----------> 3. secondary consumer
(omnivore/Carnivore)------> 4. Tertiary consumer (carnivore)-------> Quaternary
consumer (Carnivore)
-What level do decomposers feed at? - - every level
, -What is a food chain? - - It is used to show how matter and energy move through an
ecosystem. It is the linkage of who feeds on who.
-What is the pyramid of numbers? - - It records the number of individuals at each
trophic level.
-What is the pyramid of biomass? - - It represents the biological mass of the standing
stock at each trophic level at a particular point in time.
-What is the pyramid of productivity? - - It shows the flow of energy(the rate at which
the stock is being generated) through each trophic level.
-What is the 2nd law of thermodynamics? - - It says that there is a 90% loss as heat as
the trophic levels go up.
-What to the pyramids represent? - - storages
-what is bio accumulation? - - (like DDT) The producers take in the DDT, then they
primary consumers eat it from the producers (then the DDT is in their body and
tissues), then secondary consumer eat the primary consumers and they now get it in
them, and repeats and builds up the food chain. We even have DDT in us.
-What shape is pyramids of productivity? - - They are always going to be pyramid
shaped.
-What shape is pyramids of numbers or biomass? - - They may be inverted because
they represent only the stock at a given moment in time.
-What is the definition of species? - - It is defined as a group of organisms that
interbreed and produce fertile offspring.
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