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As with food crops, the "discovery, domestication and cultivation" of ornamental plants have a long history. There is indication that lilies were cultivated in China for both medicinal and decorative purposes for over two thousand years. Roses, lilies, violets, anemones, and lavender have been grown as garden plants in Europe since the time of the Roman Empire. At present the diversity of decorative plant species that are cultivated is greater than the diversity of food plants that are commonly grown around the world. In the UK alone an estimated 3,000 species, and a wide range of cultivars and hybrids, are cultivated for ornamental purposes. As "novelty and variety" are important in the horticultural market, plant biodiversity is the key to this industry as it permits the addition of new species or varieties periodically.
Ornamental plants are an important commodity in international trade due to the expanding market. As such, wild species of horticultural value are under threat around the world, due to both habitat destruction and direct exploitation for local and international trade. Important plants of ornamentals trade are: species with bulbs, orchids, cacti and other succulent plants, cycads and insectivorous plants. Over 5,000 species of orchids are recorded in CITES trade statistics during the period 1983-1989. Dendrobium is the most heavily traded genus of orchid exported from Thailand. Sri Lanka also has about 170 species of plants of ornamental value of which 74 are endemic.
Q. Which cell organelles are well-developed in secretory cells? In secretory cells, like the secretory cells of endocrine glands, organelles related to production, "exportation
What group did reproduction via sexual exchange of genetic information originate in?
Subphylum Chelicerata. Six pairs of appendages, four pairs being legs, with paired chelicerae (fangs). There are three classes in this phylum.
REPRODUCTIO N - It is not only production of new ones to increases its number but a means for the survival of a population on earth. Main aim is "survival and continuati
a) The West of Scotland Coronary Prevention Study (WOSCOPS): The study randomized healthy men between the ages of 45 and 64 years with TC levels higher that 252 mg/dL and LDL chole
Antimicrobial prophylaxis Antimicrobial prophylaxis is generally not indicated for cardiac catheterization, varicose vein surgery, most dermatologic and plastic surgery, arteri
Q. What is the cause of the immunodeficiency presented by AIDS patients? The cause of the immunodeficiency obtainable by AIDS patients is the destruction of CD4 T helper lympho
CAUSE S OF VARIATION - Effect of environmental conditions Change in the gene pattern like - (a) Random distribution of homologous genes in meiosis (b) Crossing over
Epilimnion - Summer Stratification This forms the upper layer of the lake and consists of freely- circulating warm water which is well lighted though poor in nutrients. Most o
reproduction
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