Flower petals have colors such as yellow or orange because they possess?
813027
Carotenoids.  Those are yellow and orange pigments that are found in many plants.  The best known of them is probably beta carotene (the most common isomer of carotene, which gives this category of pigments its name), found in carrots.
456475
It depends on the flower but they can attract moths, bees, beetles and bats. The reason for the scent is to attract the pollinator and the nectar is a reward for pollinating the flowers. Bee flowers are usually blue or yellow.
331986
Depends on what the person might like....or the occassion. \nColors & flowers portray different emotions....like red for passion or love and white for...truth or peace. You could give mono color flowers, or make a colorful bouquet. It will depend...just make a choice, and hopefully the person will like it! If the person is a girl..well girls love flowers in general, so I don't think you could go wrong.\n\nHere's a link to "flowers and their meaning". There are other useful websites on the net too. U can research..\n\nDifferent colors also portray different emotions and meanings. There's tonz of websites that you can read and get information on too. Just type the keywords and you will come across lots of resources.\n\nhttp://www.getromantic.com/romance/content.shtml?resources/meaningofflowers.shtml\n\nOk....goodluck! :)
710055
White (Bridal) Rose symbolizes a  happy love \n\nSingle Rose in any color expresses simplicity and gratitude \n\nWhite Roses express  Purity/heavenly, secrecy, silence, innocence and charm \n\nRed (Dark) Rose reveals unconscious  beauty \n\nRed Roses symbolize sincere Love,  Respect, Courage & Passion \n\nPink Rose carry the message of happiness, gracefulness and gentleness \n\nPink (Light) Rose  conveys admiration, gentleness, grace, gladness, joy and sweetness \n\nPink (Deep) says Thank You \n\nOrange Roses indicate enthusiasm,  desire and fascination \n\nLavender Roses symbolize love at first sight and enhancement \n\nRed (Single) means "I Love You"\n\n Yellow Roses indicate joy, gladness,  friendship and "I Care"  \n\nCoral Rose conveys desire
151447
This isn’t a science question, it’s a question of etymology, the study of words. And every colour name has its own unique history. \n\nSome colour names like ‘red’ and ‘blue’ are ancient, going back 20, 000 years or more. Nobody is quite sure who invented these words or where, but they are ancient in origin. \n\nOther colour names like ‘orange’ are only a few hundred years old and their history is well documented. In the case of orange the word only came into use after the fruit orange was imported into Europe from China about 500 years ago. Until then the objects we say are orange today were simply described as red or reddish yellow. There is a common English flower which is clearly a bright orange colour that is still called the scarlet pimpernel because it was named in the days before orange entered into the English language\n\nEvery colour  name has a history all of its own. Some are not well known and date back to the dawn of the various language groups. Other like pink or orange are reasonably well documented and only came into existence within the last few hundred years.
313933
No examples of this type of scenario come to mind immediately, and I think that I know why.  What you consider to be flowers and what the plant's flowering reproductive body actually is may not always be the same thing.  All fruiting plants have flowers, but some may be so small that they are imperceptible or unrecognizable to the human eye (like the flowers that make up the bushy part of a cauliflower).  If the flowers are too small to be pollinated by insects, then they may be pollinated by the wind, or in some cases, pollinated by the plant itself.
586901
A white lily or orchid.
1058175
Flowers which change color often do so based upon the acid or base content of the soil.\n\nThis might be the situation in your case.
262612
FLowers are the sex organs of the plant.  They are pollinated and make seeds.
310508
anks got a bit mixed up\n\nrichard__red\nof________orange\nyork_______yellow\ngave________green\nbattle________blue\nin____________indigo \nvain___________violet
206727
If you restrict this to botany, many people would say "orchids!!" This is because they are beautiful and have very intricate reproductive processes (often involving mimicry of female wasps or bees to induce males to try to mate with them, thus transfering pollen from flower to flower).\nSome others might nominate the sunflower or daisy family as the most highly evolved. The daisy-type flower itself is a very complex structure and takes a multitude of forms.
779911
Sweet peas.\n\nThe flowers are really pretty and interesting shapes, and they come in all colours.  Not something you'd put in the middle of the table at supper though...\n\nI also really like sunflowers, because they are yellow, which is my favourite colour, and they look "happy" - it's hard to explain, they just look so cheerful and they make me feel happy too.\n\n;-)
57843
i've seen white lilies, but they come in different colors. check out the link, it has a bunch of pictures.
27320
Blue, red, and yellow are primary colors. Purple, orange, and green are secondary colors.\n\nblue+red=purple\nred+yellow=orange\nblue+yellow=green\n\nComplementary colors of a primary color are the secondary color made when the other two primary colors are combined.\n\nRed and green are complementary.\nBlue and orange are complementary.\nYellow and purple are complementary.
225246
The flowers have five petals (with the exception of Rosa sericea which often has only four)
906817
well, technically, yellow roses is a sign of friendship. But now a days, it may be cuz they like the color yellow. I would think that the person was trying to be nice to me. ( Or maybe they were the color that was on sale! LOL)
326149
For flower decorations.