CONTROL SYSTEMS

AUXIN

* 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

CONTROL SYSTEMS

CONTROL SYSTEM

* 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

CONTROL SYSTEMS

GRAVITROPISM

* 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

CONTROL SYSTEMS

HORMONE

* 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

CONTROL SYSTEMS

PHOTOTROPISM

* A growth response of plants to light conditions

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

CONTROL SYSTEMS

POSITIVE & NEGATIVE PHOTOTROPISM

* 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

CONTROL SYSTEMS

POSITIVE & NEGATIVE GRAVITROPISM

* 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

CONTROL SYSTEMS

STIMULUS