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plant test DC
plant test
19
Science
7th Grade
02/14/2011

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Term
stimulus
Definition
a change in the environment that causes a response
Term
response
Definition
reaction of organism to a change in the environment
Term
positive tropism
Definition
growing toward a stimulus
Term
negative tropism
Definition
growing away from a stimulus
Term
tropism
Definition
plants growth response toward or away from a stimulus
Term
thigmotropism
Definition
plant response to touch
Term
positive thigmotropism
Definition
plant coiling around an object like a pole
Term
phototropism
Definition
a plant response to light
Term
positive phototropism
Definition
leaves and stems growing toward light
Term
geotropism
Definition
also called gravitropism. plant response to gravity
Term
positive geotropism
Definition
roots growing toward the center of gravity
Term
turgor pressure
Definition
a force that cytoplasm exerts against the cell wall in plant cells.
Term
radicle
Definition
the part of the embryo that becomes the root
Term
seed coat
Definition
the outer layer of the seed
Term
dormancy
Definition
the period of time from when the seed was produced by the mother plant until it germinates
Term
cotyledons
Definition
the first leaves "seed leaves" where food is stored
Term
germination
Definition
when the seed breaks dormancy
Term
basic parts of a plant
Definition
seed coat, cotyledon, and embryonic root, stem, and leaves
Term
hypocotyl
Definition
embryonic stem. it pushes the cotyledons until they can collect light
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