Unit 3 Life On Earth Flashcards
State what a biotic factor is and name one
A living factor that effects biodiversity
e.g parasites
Define an ecosystem
Living + non-living =ecosystem
organisms. surroundings
State what a non-biotic factor is and name one
A non-living factor that effects biodiversity e.g pollution
Define and give an example of a species habitat
A habitat is the place where an organism lives e.g cacti live in the desert
Define biome
Biomes are the worlds major communities that are classified according to the predominant vegetation and characterised by the adaptations of organisms to that particular environment
State the definition of a niche
The role an organism plays in its community
Define population
In an ecosystem, a group of organisms made of one species is called a population
Define biodivesity
The variety of all living things on earth, including animals, plants, fungi, bacteria and their genes
Define community
A community is all the living things together in an ecosystem
Define species
A group of organisms which can interbreed and produce fertile offspring
Define intraspecific competition
Members of a species that are competing with each other over a resource
Define interspecific competition
Members of a species that are competing with members of another species over a resource
What is a mutation
A random change to genetic material
What is a mutagenic agent and name one
A mutagenic agent is something that increases the rate if mutation e.g chemicals such as bromine
What is an adaptation
An inherited characteristic that makes an organism well suited to its environment
What are indicator species used for
They indicate the level of pollution by their prescience or absence of
What is biological control
The deliberate introduction of a predator/parasite to reduce the population of another species
What are GM crops
When scientists insert a useful gene from another gene into a crop plant
What is monoculture
A single crop species is grown over a large area reducing the complexity of the ecosystem to a single species
Define habitat
The place where an organism lives
Algal bloom
A rapid growth of microscopic algae often resulting In a coloured scum at the surface
What is variation
How members of the same species differ
Speciation
When a new species is formed
At each stage of the food chain what percentage if energy is lost
90%
