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20 Cards in this Set

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Hormone

A substance that is produced in one part of an organism

Target cell

Portion of an organism affected by particular hormone

Phototropism

The tendency of a plant to grow toward a source of light

Auxins

Produced in the apical meristem and are transported downward into the rest of the plant

Gravitropism

Which is the response of a plant to the force of gravity

Lateral bud

A merstematic area in the side of a stem that gives rise to side branches

Apical dominance

Closer a bud is to the stems tip, the more it is inhibited

Herbicides

High concentrations of auxins inhibit growth, many compounds are used as

Cytokinins

Plant hormones that are produced in growing roots and in developing fruits and seeds

Gibberellin

Fungus produces a growth promoting substance like this

Ethylene

One od the minor components of natural gas

Tropisms

Responses of plants to external stimuli

Thigmotropism

Response of plants to touch

Short day plants

Plant flowers when days are short

Long day plants

Plant flower when days are long

Photoperiodism

Responsible for the timing of seasonal activites such as flowering and growth

Dormancy

Period during which an organisms growth stops

Abscission

Cells at the petiole seals the leaf off from the plants vascular system

Xerophytes

Plants that live in the desert biome

Epiphytes

Plants that are not rooted in soil but instead grow directly on the bodies of other plants