types of plantae kingdom
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Answer:
Explanation:Classification of Plant Kingdom
Based on whether plants have a well-differentiated body and the presence or absence of specialized tissues for transport, and the ability to bear seeds Kingdom Plantae (Plant Kingdom) is can be classified into different divisions. The features and examples of each division are mentioned hereunder.
Division Thallophyta
These are the lowermost plants of the plant kingdom, without a well-differentiated body design. This means that the plant body is not differentiated as roots, stem, and leaves. They are commonly called algae, are permanently aquatic. Examples include Spirogyra, Chara, and Ulothrix.
Division Bryophyta
These are small terrestrial plants. They show differentiation in the body design, with stem, leaf-like structures, and root-like structures. But, they do not have any specialized tissue to conduct water and other substances. They live in damp and sandy habitats and are often referred to as the amphibians of the plant kingdom. Examples are Riccia, Funaria, and Marchantia
Division Pteridophyta
These are supposed to be the oldest vascular plants. The plant body is differentiated into roots, stem, and leaves, apart from having a specialized tissue for conduction. This tissue helps in the conduction of water and other substances from part of the plant to the other.
These plants have naked embryos called spores. The reproductive organs in these plants are inconspicuous. Examples: Marselia, Ferns
(Source: Wikipedia)
Division Phanerogamae
Phanerogams are seed-bearing plants. The plant body is well differentiated with stem, leaves, and roots. There are well differentiated reproductive tissues that produce seeds. These plants also have a well-developed vascular system.
Depending on whether the seeds produced are naked or whether they are enclosed, phanerogams are further classified into two subdivisions. They are Gymnosperms and Angiosperms
Gymnosperms
Gymnosperms are plants with naked seeds. There are about 650 living species of gymnosperm plants. The plants are usually perineal, evergreen and woody.
They have a well-developed vascular tissue but do not have vessels. The reproductive organs generally form cones or strobilus. There is no fruit formation and the seeds are hence said to be naked. Examples: Cycas, Pinus, Deodar
Pine Cone (Wikimedia Commons)
Learn about Gymnosperms in more detail here
Angiosperms
Angiosperms are seed-bearing plants. Seeds develop inside tissues that get modified to form the fruit of the plant. Also called the flowering plants, they are found abundantly in nature. These plants are usually terrestrial and they may be annual, biennial or perennial. The vascular system is very well developed with xylem and phloem. Angiosperms also show the feature of double fertilization. Examples: Mustard plant, Pea plant.
On the basis of the cotyledons (seed leaves) Angiosperms are further divided into Monocotyledonous plants and Dicotyledonous plants. Monocots have seeds with single seed leaf, having vascular bundles arranged in a complex manner. Dicots, on the other hand, have two cotyledons. The vascular bundle is arranged in a ring.
Answer:
Plants are mainly multicellular, predominantly photosynthetic eukaryotes of the kingdom Plantae. Historically, plants were treated as one of two kingdoms including all living things that were not animals, and all algae and fungi were treated as plants. However, all current definitions of Plantae exclude the fungi and some algae, as well as the prokaryotes (the archaea and bacteria). By one definition, plants form the clade Viridiplantae (Latin name for "green plants"), a group that includes the flowering plants, conifers and other gymnosperms, ferns and their allies, hornworts, liverworts, mosses and the green algae, but excludes the red and brown algae.
Green plants obtain most of their energy from sunlight via photosynthesis by primary chloroplasts that are derived from endosymbiosis with cyanobacteria. Their chloroplasts contain chlorophylls a and b, which gives them their green color. Some plants are parasitic or mycotrophic and have lost the ability to produce normal amounts of chlorophyll or to photosynthesize. Plants are characterized by sexual reproduction and alternation of generations, although asexual reproduction is also common.
There are about 320,000 species of plants, of which the great majority, some 260–290 thousand, produce seeds.[5] Green plants provide a substantial proportion of the world's molecular oxygen,[6] and are the basis of most of Earth's ecosystems. Plants that produce grain, fruit and vegetables also form basic human foods and have been domesticated for millennia. Plants have many cultural and other uses, as ornaments, building materials, writing material and, in great variety, they have been the source of medicines and psychoactive drugs. The scientific study of plants is known as botany, a branch of biology.