biology keywords

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  • Created on: 09-02-13 17:47
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Annum Hussain
Internal ­ Inside body temperature
External ­ Outside body temperature
Multicellular ­ Body made out more than one cell
Unicellular ­ Body made from one cell
Saprophytic ally ­ Digest food outside body
Autotrophically ­ Make own food example plants
Vertebrates ­ Living thing with backbone
Invertebrate ­ Animals without backbone
Species ­ A group of organisms that can breed with each other and produce a fertile offspring
Offspring ­ Babies
Variation ­ The difference in characteristics between organisms
Discontinuous variation ­ Characteristics controlled by genes (genetic variation) example blood group,
Continuous variation ­ Acquired characteristics controlled by genes and the environment (environmental
variation) example height, weight
Evaluation ­ When the environment changes then natural selection will result in the characteristics of a
species changing gradually form generation to generation
Simple reflex- An automatic response made by an animal to a stimulus
Overproduction ­ adults usually produce more young than the environment support when they are adults
Natural selection ­ Individuals of a species show variation. This can mean that some individuals will be
better able to survive in their environment and produce healthier offspring than others
Genes ­ A gene carries information that helps make you who you are. We usually get two genes one from
our mother & the other from our father.
Genotype ­ This shows the alleles in the individual. Each body cells has two genes for each characteristic
Alleles ­ One of two or more alternative forms of a gene by mutation are found at the same place on a

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Phenotype ­ The characteristics that are produced this includes what the individual looks like
Dominant allele ­ This shows when at least one copy is present in the genotype. A dominant allele is
dominant because you see its effects on the characteristics even if you have one copy of it.…read more

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Heterozygous ­ Is a person has different alleles of the same gene
Reflex arc- The simplest neurone pathway from a receptor cell to an effecter organ
Angina - Chest pain due to a heart condition
Reflex action - When the safety of an organism demands a very quick response, the signals may be
passed directly from a sensory neuron, via a relay neurone, to a motor neurone for instant, unthinking
action.…read more

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Carcinogens- Cause cancers
Carbon Monoxide- A gas in tobacco smoke that can get into the blood from the lungs
Liver cirrhosis ­ Liver damage
Ethical decisions- These are decisions about what you think is right or wrong
Narcotics ­ Are drugs that make us feel sleepy
Painkillers- block nerve impulses from pain effectors so you don't feel as much pain
Hallucinogens ­ change the way you experience a sense
Depressants ­ Increase reaction time so you respond more slowly
Stimulants ­ Reduce reaction…read more

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Carnivore- Secondary consumer
Pyramid of biomass- A diagram that shows the amount of biomass at each trophic level of a food chain
Parasite- Feeds on another organism while they living together
Muralists- When two organisms live closely together in a way that helps them both
Oxpeckers ­ African birds that eat insects which are parasites of large animals such as wild cattle.…read more

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Transpiration - The process by which water evaporates from the leaf through the stomata, creating a pull
causing water to rise up the plant in the transpiration stream.
Ureters - Transports urine from the kidney to the bladder.
Urethra- Transports urine out of the body.
Thorax- This is the name of the upper body cavity, which contains the respiratory system.…read more

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Iris -A colored set of muscles at the front of the eye which controls the size of the pupil and hence the
amount of light entering the eye.
Lactic acid Chemical produced in muscles which have been respiring anaerobic ally.
Lichen An organism formed from the symbiotic relationship between an algae and a fungus. Used as an
indicator species for pollution as they are sensitive to sulphur dioxide.…read more


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