Plant Control Systems and Defenses

a plant growth hormone that controls dormancy and leaf aging

the natural separation of flowers, fruit, or leaves from the parent plant

the suppression of lateral bud development on growing shoots

a plant growth hormone that controls root growth, bud formation, and fruit maturity

a structure at the axil (angle between a leaf and the branch it attaches to) of a branch that may develop into a new branch

repeated process that occurs within a 24-hour period; these patterns continue even without external cues

a class of plant hormones that influences tissue growth

a plant hormone that controls the ripening of fruit

the effect of gravity on plant movement

one of a class of plant hormones that regulates stem length, seed germination, flowering, sexual expression, and leaf and fruit ripening

specialized cell, found in stems and leaves, that makes eating a plant unpleasant, such as sharp crystals within cells

a specific hormone within leaves and stems that triggers a reaction when a plant's surface is wounded

quick movement by plants in reaction to temperature, humidity, or touch; these movements are reversible and repeatable

bending movement by plants in which the plant inclines in a particular direction

disease-causing organism or virus that causes harm to a host organism

plant movement based on light

chemical substance in plants that signals growth and development

chemical compound that signals growth and development in plants

the aging and decay of plant matter

protective plant part, such as a spine or thorn

a plant's response to touch

hairlike outgrowth on a plant shoot that functions to deter herbivores

the reaction of a plant shoot to avoid an obstacle to growth

a positive or negative response of a plant to a stimulus

a reversible positioning caused by changes in water content in a plant

organic compound that easily vaporizes; used for communication in plants