Glossary Definitions Flashcards
Tropisim (plant )
The DIRECTIONAL Growth of a plant organ in response to a stimulus like Light, Gravity or touch.
(+ve or -ve)
Nastic Response (plant)
A NON-DIRECTIONAL response of plant organ to the intensity of stimuli. E.g; thermonasty ( tulips open in warmth).
Kinesis (Animal)
The change in the rate of movement of an animal in response to NON-DIRECTIONAL stimuli. E.g; slaters move more when exposed to light)
Taxes (Animal)
DIRECTIONAL orientation movement towards/AWAY from stimuli.
Homing
The ability of organisms to return home/base after searching for mates or foraging.
Migration
A regular annual mass movement of populations from breeding nesting to the feeding site and return.
Zungunruhe
Migratory restlessness
Pineal Gland (birds)
an outgrowth of forebrain related to secreting melatonin which regulates activity patterns.
Pulvini cells (plants)
Cells at base of leaves which can rapidly change turgor pressure and cause lead to droop rapidly.
Sun compass
Ability to navigate using sun movemnt and a body clock.
Geomagnetic compass
ability of organisim to use magnetic lines around earth to navigate
star compass
= using the position of the stars to navigate
SCN (Suprachiasmic Nuclei) (mammal)
Area in brain of mammals which detect photoperiodism.
Klinostat
mechanism to remove stimulus or gravity in plant or cell growth.
IAA (AUXIN)
hormone in plants made in shoot tip and root tip whhc involved in growth movement. Causes differeital elongation.
