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Green Seal is a non-profit, third-party certifier and standards development body in the United States. Since 1989 it has provided independent, objective, science-based guidance to the marketplace and to consumers. Green Seal is the largest US-based ecolabeling organization and meets the United States Environmental Protection Agency's Criteria for Third Party Certifiers, the requirements of ISO 14020 and 14024, and the standards of the Global Ecolabelling Network. Green Seal is the U.S. member of GEN which consists of 26 of the world's leading ecolabeling programs, including Germany's Blue Angel (certification) and the Nordic swan.
A Green Seal Certification Mark on a product means that it has gone through a stringent process to show that it has less impact on the environment and human health. Green Seal takes a life cycle assessment approach, evaluating a product from the raw materials through the manufacturing process and ending with recycling or disposal. Products only become certified after rigorous science-based evaluation, including on-site plant visits. The Green Seal means that the product has passed the tests; that it works as well as or better than others in its class, and that it has been evaluated without bias or conflict of interest.
Poisonous food plants
Many food plants possess toxic parts, are toxic unless processed, or are toxic at certain stages of their life. Notable examples include:
- Apple(Malus domestica). Seeds containcyanogenic glycosides; in most species, the amount found in a single fruit won't kill a person; but it is possible to ingest enough seeds to provide a fatal dose.
- Cassava(Manihot esculenta) Toxic in the unprocessed form.
- Cherry(Prunus cerasus), as well as other species (Prunus spp) such aspeach (Prunus persica), plum (Prunus domestica), almond (Prunus dulcis), and apricot (Prunus armeniaca). Leaves and seeds contain cyanogenic glycosides.
- Chocolate. Containstheobromine at levels toxic to dogs and cats.
- Indian pea(Lathyrus sativus). A legume grown in Asia and East Africa as an insurance crop for use during famines. Containsoxalyl-L-Î±,Î²-diaminopropionic acid (ODAP), a neurotoxin causing wasting and paralysis if eaten over a long period.
- Kidney beanor common bean (Phaseolus vulgaris). Contains the lectinphytohaemagglutinin, which causes gastric upset. Toxicity removed by thorough cooking.
- Nutmeg(Myristica fragrans). Containsmyristicin.
- Lima beanor Butter Bean (Phaseolus lunatus). Raw beans contain dangerous amounts oflinamarin, a cyanogenicglucoside.
- Lupin. Some varieties have edible seeds. Sweet Lupins have less, and Bitter Lupins have more of the toxic alkaloidslupinine and sparteine.
- Onions and garlic. Onions and garlic (genus Allium) containthiosulphate, which in high doses is toxic to dogs, cats and some other livestock.
- Potato(Solanum tuberosum). Foliage and green-tinged tubers are toxic, containing the glycoalkaloidsolanine, which develops as a result of exposure to light. Causes intense digestive disturbances, nervous symptoms, and in high enough doses, death.
- Rhubarb(Rheum rhaponticum). Leaf blades, but notpetioles, contain oxalic acidsalts, causing kidney disorders, convulsions, coma. Rarely fatal.
- Tomato(Solanum lycopersicum). Foliage and vines containalkaloid poisons which cause digestive upset and nervous excitement.
Other poisonous plants
- Aconitum(Aconite, wolfsbane, monkshood) (Aconitum napellus). The poison is concentrated in the unripe seed pods and roots, but all parts are poisonous. Causes digestive upset, nervous excitement. The juice in plant parts is often fatal. It is a quick-acting poison often used to coat poisonous arrows in Asia.
- Adenium obesum. Also known as Sabi Star, Kudu or Desert-rose.The plant exudes a highly toxic sap which is used by the Akie and Hadza in Tanzania, to coat arrow-tips for hunting.
- Agave. The juice of a number of species causes acute contact dermatitis, with blistering lasting several weeks and recurring itching for several years thereafter.
- Abrus precatorius, known commonly as Jequirity, Crab's Eye, Rosary Pea, 'John Crow' Bead, Precatory bean, Indian Licorice, Akar Saga, Giddee Giddee orJumbie Bead inTrinidad & Tobago. Particularly dangerous as the brightly-coloured seeds (usually black and red) are commonly used in jewellry and easily eaten by children.
- Angel's Trumpet (Brugmansia). All parts of the plant contains the tropane alkaloidsscopolamine and atropine. Often fatal.
- Asparagus. The berries are poisonous.
- Autumn crocus. The bulbs are poisonous and cause nausea, vomiting, diarrhea. Can be fatal.
- Azalea. (Azalea ssp.) All parts of the plant are poisonous and cause nausea, vomiting, depression, breathing difficulties, coma. Rarely fatal.
- Bittersweet nightshade
From Yahoo Answers
Answers:Plants with variegated leaves, e.g. Duranta (In a variegated leaf only certain parts are green, the rest of the leaf does not contain chlorophyll.) can still photosynthesize through the green parts of the plant which contain chlorophyll. The 'green pigment' is chlorophyll. Chlorophyll appears green because it reflects most of the green light. Hence leaves appear green. However, it is absolutely possible for all plants (green/or variegated) to photosynthesize. For plants who have red leaves, it is just so that the leaf reflects red light, hence appearing red. It still contains chlorophyll.
Answers:Chlorophyll is only one kind of photosynthetic pigment. Actually there are various different kinds of chlorophylls, all of which tend to absorb efficiently in the red and blue-ish parts of the spectrum, but not the green - thus, they appear green to us. However, other pigments also exist, the most common of which are xanthophyll (yellow) and carotene (orange). Chlorophyll is extremely efficient (its highest absorption peak is at the wavelength peak of natural sunlight, 475 nm). So this is why most leaves are green normally. However, there's another player: just as with humans, UV light can be damaging to plants. And just as humans have melanin to protect against UV damage, plants also have a protective pigment - anthocyanins. These come in a wide range of colors - reds, purples, pinks, etc. They're responsible for the intense purple colors some plants have. Note that these plants will be less efficient at photosynthesis as a result (since they're wearing sunscreen, essentially). Anthocyanins also get produced in the fall after chlorophyll breaks down (to protect the leaf from damage during this period), which gives us the vivid colors we're so enamored of.
Answers:Any conifer, cycad, fern (or fern-ally), moss, or liverwort species will do. Look up several of those, and you'll have many good examples. The links below will get you started: scroll towards the bottom of any of those pages, and you'll get a taxonomy of everything in that phylum. Click around til you find a particular species or genus you like, and you've got a good example.