definition
define positive gravitropism
plant grows down towards the direction of gravity
define positive chemotaxis
an animal moves towards a chemical, which is often a food source
what does cell elongation mean
for the cell to get longer
define migration
Annual mass movement of animals of great distances, for breeding or feeding purposes
define solar navigation
an ability to use the location of the sun to find your way
define innate
inherited, born with trait/behaviour/knowledge
what effect do auxins have on stem cells
causes cell elongation
name 3 costs to migration
large amount of energy use, death by predation, getting lost, death by exhaustion
define a nastic response
a non-direction turgor response in plants
define homing
an innate ability to find your way home over familiar and unfamiliar territory
what effect do auxins have on root cells
inhibit cell elongation
name 3 benefits to migration
more food, longer feeding times, more mild conditions, more mate opportunities, weak die so stronger gene pool
A plant grows towards light
Positive phototropism
define adaptive advantage
something that results in the increase survival and reproductive success of an organism
explain the adaptive advantage of positive thigmotropism
less energy used to grow into canopy, to access more light for photosynthesis for max growth or energy for reproduction
how do animals know when to migrate
biological clock recognises the appropriate increase or decrease in day length
define navigation
Determining the position relative to other locations.
define kineses
Non-directional movement response in animals in which the rate of activity is determined by the intensity of the stimulus.
explain how a nastic response occurs
A rapid loss of turgor in specialised cells call pulvini, results in the rapid drop of the plant limb
explain how animals use the earths magnetic fields to navigate
they have magnetite or similar in brain, can align with ley lines to find direction