Key words for Biology Topic 5


AS - Level Biology (Topic 5) Flashcards on Key words for Biology Topic 5, created by Alice Storr on 06/01/2017.
Alice Storr
Flashcards by Alice Storr, updated more than 1 year ago
Alice Storr
Created by Alice Storr almost 7 years ago

Resource summary

Question Answer
Abiotic Non-living factors that influence an ecosystem
Autotroph Energy from the environment used to make their own food
Biome An ecosystem for a certain group of organisms
Biosphere Part of Earth inhabited by organisms
Biotic Living factors which influence an ecosystem
Chemotroph Energy comes from inorganic chemicals
Community Populations sharing an area
Consumer Heterotrophs, surive by eating producers and other organisms
Ecology Relations of organisms to each other and their environment
Ecosystem Biological community of interacting organisms and their physical environment
Evolution Organism adapting to changes in the environment through genetic mutations and passing on succesful traits (survival of the fittest)
Food Chain A sequence of organisms showing energy transfer between organisms
Food web Representation of interconnected food chains
Habitat Natural home of organisms
Heterotroph Energy from organic sources - eats other organisms for energy
Microhabitat A unique part of a habitat
Niche A unique adaption of an organism allowing it to exploit its environment
Photosynthesis Process of plants changing CO2 to O2 and H2O to C6H12O6 involving the light independent and dependent reactions
Phototroph Energy from converting light energy into food
Population Group of organisms in a particular place
Producer First part of a food chain (1st trophic level). Gets energy from sunlight/environment (autotroph) and is predated by consumers
Speciation Formation of new species - allopatric or sympatric causes
Species A group of interbreeding organisms who produce fertile off-spring
Succession Process of organisms developing in an area of land. Starts with pioneering species. Reaches climax communoty. Has a dominant or co-dominant species. Can be deflected with human intervention.
Trophic Pyramids Graphical representation showing biomass at each trophic level in an ecosystem
Topography Shape of the land - abiotic factor. Includes steepness of a slope, aspect and drainage
Colonisation (succession) The pioneer species begin life in areas which are too harsh for more complex life forms. Break up surface, add nutrients and DOM which increases water-holding capacity of soil.
Climax community Stable stage of succession. No reason to change unless environment changes.
Primary succession On areas of land which have not previously hosted life
Secondary succession Life begins on areas of land which previously hosted life but were cleared (eg. following a forest fire)
Deflected succession The natural process of succession is altered by human activiity, preventing succession taking place (eg. sheep grazing on grass stop soil being approproate for more complex organisms)
Chloroplast (and what it contains /8) The centre of photosynthesis. Contains: thylakoid membrane, thylakoid space, starch grain, DNA loop, outer membrane, inner membrane, granum, stroma
Photosystem Clusters of photosynthetic pigments in the thylakoid membranes. Several hundred of these pigments surrounding a primary chorophyll molecule
Electron transport chain Consists of several electron carrier molecules and is formed in the light-dependent reactions of photosynthesis
Photophosphorylation The synthesis of ATP from ADP+P
ATPase Catalyses the breakdown of ATP to ADP
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