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Organism Force/Motio

7.7B FORCE & MOTION IN ORGANISMS (Plants only)

TermDefinition
FORCE Push or pull that can change the motion of an object.
MOTION Change in an object's position with respect to time & in comparison to the position of other objects used as reference points.
GERMINATION Process by which a plant grows from a seed, a.k.a. seedling emergence.
VACUOLE Organelle in cell cytoplasm; functions to store water, nutrients, & wastes; 1 large central unit in plant cells, several small units in animal cells.
TURGOR PRESSURE Force of water molecules against the cell wall that allows plants to stand up straight; "turg = swollen."
TROPISM Turning of all or part of an organism in a particular direction in response to an external stimulus, e.g. gravity, light, water, touch, heat, etc.
PHOTOTROPISM Orientation of a plant or other organism in response to light, either toward or away from the source of light; "photo = light."
HYDROTROPISM Growth or turning of plant roots toward or away from moisture; "hydro = water."
GEOTROPISM/ GRAVITROPISM Plant’s growth in response to the force exerted upon it by gravity; "geo = earth" & "gravi = gravity."
WILT Become limp or droopy due to heat, loss of water, or disease.
TURGID State of plant cells when their vacuoles are filled with water, causing the plant leaves to stand upright; "turg = swollen."
STOMATA Small openings on the underside of a leaf through which oxygen, carbon dioxide, and water can move.
PHLOEM The vascular tissue through which food moves in some plants.
XYLEM The vascular tissue that carries water upward from the roots to every part of a plant.
EMERGENCE Process of coming into view or becoming exposed after being concealed.
THIGMOTROPISM A growth response to touch.
FLACCID Limp, not firm; lacking vigor or effectiveness.
Created by: trauberk
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