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The Plant Kingdom- An Introduction

Kingdom Plantae: The Kingdom of multicellular Producers
The plant kingdom comprises multicellular photosynthetic organisms. They constitute the predominant producers of the biosphere. They include both aquatic and terrestrial plants.
The aquatic plants include both fresh water and marine; they are green, red and brown algae.
Spirogyra
Spirogyra
Land plants are grouped into bryophytes and tracheophytes.
Horn Worts
Horn Worts
Bryophytes are non vascular plants. They are comprised moss and liverworts which live only in moist places.
Examples: Riccia, Marchantia, Anthoceros, Funaria.
Tracheophytes include all the plants with vascular system. Body of these plants are distinguished into stem, leaves and roots. Tracheophytes are grouped into Pteridiophytes, Gymnosperms and Angiosperms.
selaginella
Selaginella
Pteridiophytes are producing neither flowers nor seeds.
Examples: Psilotum,Lycopodium, Selaginella etc
Gymnosperms and angiosperms are seed bearing plants.
image
Cycas
Gymnospems seeds are without fruits (naked seeds). Eg: Cycas, Pinus, Deodar etc.
Angiosperms produce covered seeds i.e., within the fruit or seed  are covered by the ovary.
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Orchid
Characters: 

Habit and Habitat
Immobile and photosynthesising plants. Some flowerings have evolved a heterotrophic mode of life.
Nutrition
 Nutrition is autotrophic. Plants prepare the food materials from water, carbon dioxide and inorganic essential elements using light energy trapped by chlorophyll and accessory pigments.
Structure
Plants are immobile. The plant cells are covered by a rigid cell wall formed of cellulose. So cells are not capable of contraction and relation. The plant body is formed of tissues; organs like structures and vascular tissues are present in higher forms.
Reproduction
It occurs by asexual and sexual or both.


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