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Science Chemical Change M3 S3 L5
Alberta LTB Module Booklet Vocabulary Module 3 Section 3 Lesson 5
8
Chemistry
10th Grade
02/24/2020

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Cards

Term

CONTROL SYSTEMS

 

 

AUXIN

Definition

* A plant hormone that promotes cell elongation in stem cells as a response to a light source

 

*Auxin is a plant hormone produced in the stem tip that promotes cell elongation. Auxin moves to the darker side of the plant, causing the cells there to grow larger than corresponding cells on the lighter side of the plant

Term

CONTROL SYSTEMS

 

 

CONTROL SYSTEM

Definition

* A system within plants that produces definite responses to specific stimuli

 

 Plants do not have any muscular system or nervous system. But, they are still able to show movement and also coordination. These movements are always controlled and not haphazard

Term

CONTROL SYSTEMS

 

 

GRAVITROPISM

Definition

* The growth response of plants to Earth's gravitational system

 

*Is a coordinated process of differential growth by a plant or fungus in response to gravity pulling on it

Term

CONTROL SYSTEMS

 

 

HORMONE

Definition

* A chemical produced by a cell in one location that travels to another location where it produces an effect

 

Plant hormones are signal molecules produced within plants, that occur in extremely low concentrations. Plant hormones control all aspects of growth and development, from embryogenesis, the regulation of organ size, pathogen defense, stress tolerance and through to reproductive development

Term

CONTROL SYSTEMS

 

 

PHOTOTROPISM

Definition

* A growth response of plants to light conditions

 

* Refers to the growth movement of a plant in response to light

Term

CONTROL SYSTEMS

 

POSITIVE & NEGATIVE PHOTOTROPISM

Definition

* Positive phototropism is the response of the stem of a plant to grow toward a source of light

 

* Negative phototropism is the response of a root of a plant to grow away from a source o light

Term

CONTROL SYSTEMS

 

 

POSITIVE & NEGATIVE GRAVITROPISM

Definition

* Positive gravitropism is the response of the root of a plant to grow toward the force of gravity

 

* Negative gravitropism is the response of a stem of a plant to grow against thee force of gravity

Term

CONTROL SYSTEMS

 

 

STIMULUS

Definition
* Something in the environment that causes a reaction by an organism
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