diversity in plants
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WHAT IS DIVERSITY ?
Diversity is a commitment to recognizing and appreciating the variety of characteristics that make individuals unique
in an atmosphere that promotes and celebrates individual and collective
achievement. NEXT
PLANTAE
The first level of classification among plants depends on whether the plant body has
well- differentiated, distinct components. The next level of classification is based on whether the differentiated plant body ha special tissues for the transport of water
and other substance within. Further classification looks at the ability to bear
seeds and whether the seeds are enclosed within fruits. NEXT
THALLOPHYTA
A phylum of plants of very diverse habit and structure, including the algae, fungi, and lichens. The simpler forms, as many blue-
green algae, yeasts, etc., are unicellular and reproduce vegetatively or by means of asexual spores; in the higher forms
the plant body is a thallus, which may be filamentous or may consist of plates of cells; it is commonly undifferentiated into
stem, leaves, and roots, and shows no distinct tissue systems; the fronds of many algae, however, are modified to serve many of the
functions of the above-named organs. Both asexual and sexual reproduction, often of a complex type, occur in these forms. The
Thallophyta exist almost exclusively as gametophytes, the sporophyte being absent or rudimentary. By those who do not
separate the Myxophyta from the Tallophyta as a distinct phylum the latter is treated as the lowermost group in the vegetable
kingdom.NEXT
EXAMPLES OF TYALLOPHYTA – ALGAE
ULVA SPIROGYRA CHARA
CLADOPHORA ULOTHRIXNEXT
BRYOPHYTA
A member of a large group of seedless green plants including the mosses, liverworts, and hornworts. Bryophytes lack the specialized tissues xylem and
phloem that circulate water and dissolved nutrients in the vascular plants. Bryophytes generally live on
land but are mostly found in moist environments, for they have free-swimming sperm that require water for transport. In contrast to the vascular plants, the
gametophyte (haploid) generation of bryophytes constitutes the larger plant form, while the small
sporophyte (diploid) generation grows on or within the gametophyte and depends upon it for nutrition.
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EXAMPLES OF BRYOPHYTA
RICCIA MARCHANTIA
FUNARIA NEXT
PTERIDOPHYTA
A large group of higher plants to which are sometimes assigned all higher seedless plants
except mosses (Bryophyta). Unlike the bryophytes, the sporophyte—the asexual generation—is well
developed and divided, except in Psilotophyta, into stems, leaves, and roots. Spores develop, from which emerges the gametophyte—the sexual
generation. The gametophyte is poorly developed, almost undifferentiated, and bears sexual organs (in males, antheridia, and in females, archegonia). After fertilization, another asexual generation develops.
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EXAMLES OF PTERIDOPHYTA
FERNS MARSILEANEXT
GYMNOSPERMS
Gymnosperms are a group of vascular plants whose seeds are not enclosed by a
ripened (fruit). Gymnosperms are distinguished from the other major group of seed plants,
the angiosperms, whose seeds are surrounded by an ovary wall. The seeds of many
Gymnosperms (literally, naked seed) are borne in cones and are not visible. Taxonomists now
recognize four distinct divisions of extant gymnospermous plants (coniferophyta,
cycadophyta, ginkgophyta, and gnetophyta).NEXT
EXAMPLES OF GYMNOSPERMS
CYCUSPINUS
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ANGIOSPERMS
Any of a large group of plants that produce flowers. They develop seeds from ovules contained in
ovaries, and the seeds are enclosed by fruits which develop from carpel's. They are also distinguished by the process of double fertilization. The majority
of angiosperms belong to two large classes : monocotyledons and eudicotyledons. The
angiosperms are the largest phylum of living plants, existing in some 235,000 species. They
range from small floating plants only one millimeter (0.04 inch) in length to towering trees
that are over 100 meters (328 ft) tall.NEXT
EXAMPLES OF ANGIOSPERMS
MONOCOTS - PAPHIOPEDILUM
DICOTS - IPOMOEA
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