plant

Table of Contents

Introduction
Definition of the kingdom
Nonvascular plants
- Definition of the category
- Representative members
  - Division Bryophyta
  - Division Marchantiophyta
  - Division Anthocerotophyta
Vascular plants
- Definition of the category
- Nonseed plants
  - Class Lycopodiopsida
  - Class Polypodiopsida
    - Subclass Polypodiidae
    - Order Psilotales
    - Order Equisetales
    - Order Marattiales
- Seed plants
  - Gymnosperms
  - Angiosperms
  - Classification of angiosperms
  - Stems
  - Leaves and roots
  - Flowers
  - Fruits and seeds
Reproduction and life histories
- Life histories
  - Homosporous life histories
  - Anisosporous life histories
  - Heterosporous life histories
- Variations involving seed plants
- Asexual reproduction
- Deviations from the usual life history
Plant physiology
- General features of plant nutrition
  - Mode of nutrition
  - Essential elements and minerals
  - General overview of metabolic cycles
- Pathways and cycles
  - Control mechanisms
  - Principal pathways and cycles
- Unique features of plant metabolism
- Photosynthesis
  - Basic mechanisms
  - Specific variations in photosynthesis
Ecology
- Plant geography
- Succession and zonation
- Ecosystems and the biosphere
- Dispersal and colonization
- Human effects on plants and natural communities
  - Domestication
  - Changes in biosystems: pollution
- Conservation
Evolution and paleobotany
- Evolution of land plants from the Ordovician Period through the middle Devonian
- Evolution of seed plants and plant communities
Classification
- Annotated classification
- Critical appraisal

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Glimpse the diversity of plant evolution that provides food and habitats for other life to thrive

Study adaptations evolved by bryophytic mosses, hornworts, and liverworts and those of vascular angiosperms

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Photosynthesis diagram showing how water, light, and carbon dioxide are absorbed by a plant and that oxygen and sugars are produced. Also show a person to illustrate the oxygen/carbon dioxide cycle between plants and animals.

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plant summary

plant

organism

Also known as: Embryophyta, Metaphyta, Plantae

Written by Hans Lambers, Rudolf Schmid, John H. YoppSee All

Fact-checked by The Editors of Encyclopaedia Britannica

Article History

weeping willow tree

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Category: Animals & Nature

Key People:: Alexander von Humboldt; Sir Hans Sloane, Baronet; Henry Chandler Cowles; Julius von Sachs; Dennis Robert Hoagland

Related Topics:: angiosperm; plant development; fern; photosynthesis; heirloom plant

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plant, (kingdom Plantae), any multicellular eukaryotic life-form characterized by (1) photosynthetic nutrition (a characteristic possessed by all plants except some parasitic plants and underground orchids), in which chemical energy is produced from water, minerals, and carbon dioxide with the aid of pigments and the radiant energy of the Sun, (2) essentially unlimited growth at localized regions, (3) cells that contain cellulose in their walls and are therefore to some extent rigid, (4) the absence of organs of locomotion, resulting in a more or less stationary existence, (5) the absence of nervous systems, and (6) life histories that show an alteration ...(100 of 20146 words)

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