B2- Understanding our Environment

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  • Created by: el_b
  • Created on: 18-02-14 18:26
What is the order of classification?
Kingdom --> Phylum --> Class --> Order --> Family --> Genus --> Species
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What are natural classification systems?
Natural classification systems are based on the evolutionary relationships and genetic similarities between organisms
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What are artificial classification systems?
Artificial calssification systems are based on appearance rather than genes
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What does the term species mean?
a species is a group of organisms which can interbreed to produce fertile offspring
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What is Asexual reproduction
asexual reproduction is where an organism reproduces by making a copy of itself.
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What is a hybrid?
if you interbreed a male from one species with a female from another species you'll get a hybrid
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what is a pyramid of number?
a pyramid of number shows the amount of living organisms at that trophic level
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what is a pyramid of biomass?
a pyramid of biomass shows the dry weight of the organisms, it shows the total mass of living material
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what are the ways animals lose energy? (MRS GREN)
movement, respiration, sensitivity, growth, reproduction, excretion, nutrition
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Can excretory products be the start of a food chain?
yes, faeces can be the starting point of other food chains, DECAY
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Carbon cycle: the oceans absorb CO2, acting as what?
Carbon sinks
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Carbon cycle: marine organisms have ____ made of calcium ____
1.) shells 2.) carbonate
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overtime, shells in the carbon cycle become....
limestone
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Carbon cycle: CO2 returns to the air during ____ eruptions or ____
1.) volcanic 2.) weathering
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what is nitrogen an essential component for?
amino acids and proteins
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what is the job of saprophytic bacteria?
begin decomposition of dead animals and plants into ammonia
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what is the job of nitryfing bacteria?
converts ammonia into soluable nitrates the plants can absorb using the process of nitrification
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What is the job of denitryfing bacteria?
release nitrogen back into the atmosphere under anaerobic conditions, very deep in the soil
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what is the job of nitrogen fixing bacteria?
converts nitrogen from air and use it to make their own proteins
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what is lightning?
in thunder storms electrical energy combines nitrogen and oxygen to form oxides, these dissolve in the rain and form nitrates in the soil
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what is a population in biology?
a population is the number of individuals of the same species living in a certain habitat
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what is a community?
a community includes all the different species living in a certain area
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what is meant by the term interspecific?
different species competing with each other
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what is meant by the term intraspecific?
the same species competing with each other
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what is a ecological niche?
the position of an organism or population in an ecosystem
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what do plants compete for?
light for photosynethesis, water/minerals and space
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what do animals compete for?
a mate, food and shelter
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Card 2

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What are natural classification systems?

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Natural classification systems are based on the evolutionary relationships and genetic similarities between organisms

Card 3

Front

What are artificial classification systems?

Back

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Card 4

Front

What does the term species mean?

Back

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Card 5

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What is Asexual reproduction

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