Biology Plant responses and Animal Behaviour

50 terms by Yolandi

Create a new folder

Advertisement Upgrade to remove ads

abiotic factors

physical factors in the environment which can act as a stimuli for the organisms' responses

tolerance

the range of physical factors which are favourable for the organism

biotic factors

biological influences on organisms within an ecosystem

stimulus

change in environment which causes a response in an organism

receptor

any cell or group of cell which detects a change in stimuli

effector

a cell or group of cells which respond to change

interspecific

relationships between different species

intraspecific

relationships between organisms in the same species

ecosystem

all things living in a particular area including physical factors

habitat

he place or environment in which specific organisms live

limiting factor

any variable factor which limits the activity of an organism or population

gause's principle

no two species with identical ecological niches can co-exist for long in the same place

ecological niche

the way an organism lives

biological clocks

Internal timing systems that continue without external clues, and control (to some extent) the timing of activities of plants and animals.

period of the rhythm

the time it takes to complete one cycle of activity

phase shift

a shift in the activity of a biological rhythm, typically provided by a synchronizing environment stimulus

free running period

The natural period of the rhythm if there are no external cues.

entrainment

Process by which an internal clock becomes reset by rhythmic environmental factors

zeitgeber

the environmental agent that resets the biological clock e.g: change in light, temperature

circadian

of or relating to biological processes occurring at 24-hour intervals

circa

about

circatidal

A rhythm of about 12.5hours

circalunar

A rhythm of about 1 month

circaannual

A rhythm of about 1 year

photoperiod

the response in animals and plants to the length of the day and night

exogenous rhythm

A rhythm that continues only when external cues are present.

endogenous rhythm

An internal rhythm that occurs when there are no external cues. Caused by a biological clock

tropism

the growth response of a plant toward or away from a stimulus

nastic movement

a plant's response to a stimulus such that the direction of the response is preprogrammed and not dependent of the direction of the stimulus

taxes

movement of a whole organism towards or away from a stimulus

kinesis

a non-directional response to to a stimulus - animals

homing

Ability of an animal to find its way home over unfamiliar territory

auxin

substance produced in the tip of a seedling that stimulates cell elongation

apical dominance

Concentration of growth at the tip of a plant shoot, where a terminal bud partially inhibits axillary bud growth

cytokinins

Concentration of growth at the tip of a plant shoot, where a terminal bud partially inhibits axillary bud growth

gibberellins

a growth hormone that causes a wide variety of effects. One role is to stimulate growth of stems by promoting cell division. Farmers use it to make fruit grow larger

apical meristem

the growing region at the tips of stems and roots in plants

ethylene

hormone that promotes leaf abscission and fruit ripening

abscisic acid

hormone that promotes bud and seed dormancy and inhibits leaf abscission

etiolation

the act of causing a plant to develop without chlorophyll by growing it without exposure to sunlight

short day plants

plants that bloom only when the period of daylight is shorter than a specific period of darkness

long day plants

plants that bloom only when the period of day is longer than a specific period of darkness

day neutral plants

A plant in which flowering can occur irrespective of the day length

phytochrome

pigment used to measure time

vernalisation

Exposure of seeds to a period of cold to break the seeds' dormancy

dormancy

a period when an organism's growth or activity stops

stratification

when a moist seed is exposed to a low temperature for many days to break dormancy

scarification

the process where seeds need to be scratched or treated in a rough way before it can germinate

ephemerals

a chemical present in desert plants which prevents germination unless there is sufficient ain which washes the chemical away

abscission

shedding of flowers and leaves and fruit following formation of scar tissue in a plant

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording

Create Set