GCSE WJEC Biology- classification + biodiversity

order of terms to explain natural selection

(My Voice Can Sound Rude)

mutation

variation

competition

survival

reproduction

1st part + 2nd part of animal scientific name

1st= genus

2nd= species

equation for population size (capture- recapture)

number in 1st sample x number in 2nd sample ÷ number in 2nd previously marked

biodiversity of habitat is impotant bc

• regulates gases in atmospere

  soil fertility

things to do before introducing alien species (for biological control)

• ensure organism only attacks the pest

• ensure organism doesnt carry disease

  ensure it can be succesfully bred

extinct definition

when a species has no living members

intra- specific comp

comp between members of the same species

vertebrates

has a back bone

variation

something is different

animals compete for

food

• territory

  mates

alien species definiton

organisms introduced from other countries

plants compete for

• light

• water

  minerals

inter- specific comp

comp between different species

3 reasons ppl bring unwanted species to UK

• pets

• accidentally (vehicles)

• pest control

reproduction

more likely to have offspring

capture- recapture data assumptions made

• no death

• no mass immigration/ emigration

• marking does not effect chances of survival

what is a species

• more common characteristics w eachother

• can interbreed to produce fertile offspring

humans use organisms for

• food

• clothing

• medicines

survival

better features help them survive better

competition

more likely to win

mutation

changes occur to genes

biological control definition

the control of a pest by the introduction of a natural enemy/ predator

transects show

frequency + distribution of species in a habitat

what is biodiversity of a habitat/ ecosystem

• no. different species

  no. individual of each species

sustainability means

• use only resources we need

• replace what we take

• no species become extinct and are able to use them in the future

cons of biological control

• slower than pesticides

• more expensive

  doesn’t get rid of pest completely

7 classification groups (in order)

Kings Put Crowns On Fluffy Grey Sharks

King

Phylum

Class

Order

Family

Genus

Species