Why are some flowers yellow?  From Cristin C. 1st grade?
440292
Flowers try to attract insects that will pollinate them.  They do this by being bright colors that insects will notice, and by having sweet smells that insects like.  Yellow is a common color for flowers because it is bright and easy for insects to see.
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)
224357
Please take the time to\nvote for the best answer\n\nThank You!!\n\nYellow, the royal color used by the emperors, represents power and authority (2). It is associated with the Earth Element, which symbolizes growth (2). The Chinese word for yellow, huang, sounds like the word for "royal," and thus was chosen thousands of years ago as the exclusive color for the imperial household (1). Under the penalty of death, no Chinese person other than the emperor was permitted to be clothed in any shade of yellow or gold (1). Figure 2 below displays some portraits of some ancient Chinese emperors bearing the national color of old China, yellow/gold.\n\n\n\nIn Egypt and Burma, yellow signifies mourning.\n\nIn Spain, executioners once wore yellow.\n\nIn India, yellow is the symbol for a merchant or farmer.\n\nIn tenth-century France, the doors of traitors and criminals were painted yellow.\n\nHindus in India wear yellow to celebrate the festival of spring.\n\nIf someone is said to have a “yellow streak,” that person is considered a coward.\n\nIn Japan during the War of Dynasty in 1357, each warrior wore a yellow chrysanthemum as a pledge of courage.\n\nA yellow ribbon is a sign of support for soldiers at the front.\n\nYellow is a symbol of jealousy and deceit.\n\nIn the Middle Ages, actors portraying the dead in a play wore yellow.\n\nTo holistic healers, yellow is the color of peace.\n\nYellow has good visibility and is often used as a color of warning. It is also a symbol for quarantine, an area marked off because of danger.\n\n“Yellow journalism” refers to irresponsible and alarmist reporting
813056
During  a recent experiment our finding with red, green, blue, yellow and clear lights were as follows:\n\nOur results show that the red group grew the most in height, and the yellow and green groups exhibited similar amounts of growth. The blue group grew the least of the colored groups, but the clear and control groups grew the least of all the groups.
44250
The age tottally varies,ussally they catch it when you are in pre-school learning your colors, as it's kind of wierd to them if every time they say "color the flower blue" you color it purple.
1015359
using simple physics\n\nThe blue color of the sky is due to Rayleigh scattering. As light moves through the atmosphere, most of the longer wavelengths pass straight through. Little of the red, orange and yellow light is affected by the air.\n\nthe grass is green because the other colors are absorbed and only green is reflected. Grass and most other plants are green because they contain a pigment known as chlorophyll.\n\nSun isn't really yellow. The color yellow is a purely human interpretation of a collection of radiation that hits the retinae of our eyes and gets processed by our visual cortex.
1053473
Isn't it the fruit?  Flowers on a strawberry plant are small and white with yellow centers.  As with most fruit, this flower is the site that turns into the edible fruit that contains seeds for dispersal.
1079172
because flowers are considered beautiful and attractive and somewhat good smelling objects. ppl in their right brians r usually attracted to things that smell good and look good to them.
11031
Because chlorophyll is green.
73710
THE HOW AND WHY OF FLOWER COLOR \nBy Dr. Leonard Perry, Extension Professor \nUniversity of Vermont \n  \n\nThe main reason most of us grow flowers is for their colors. The color provided by flowers and the combinations of colors, and the feelings these evoke, is the main reason I and others I know garden. Yet have you ever thought about what makes flowers the colors that they are or how you can describe these colors to others? \n\nWhat may seem simple on the surface is really a lot more complicated than you might think. The color that you see in flowers is actually the result of reflected light from various plant pigments. \n\nA group of compounds called "anthocyanidins" are the basic ingredients. They are named for the flowers in which they were first found, such as the scarlet "pelargonidin" from the geranium or Pelargonium, the purple "petunidin" from the Petunia, or the blue-violet "delphinidin" from the Delphinium. \n\nIt is these anthocyanidin pigments that biotechnologists are studying to change flower colors. For instance, they've taken the scarlet pelargonidin-producing gene from corn and placed it into petunias to give this flower a novel orange color. \n\nThe gene for delphinidin (blue-violet) has been placed into carnations to make some blue. Other factors within the cell, such as the acidity (pH) and even cell shape, are making the genetic production of blue mums and roses a bit more challenging. \n\nCombine the anthocyanidin compounds with sugar in plants to produce the more common "anthocyanin" pigments responsible for our fall leaf colors, among other colors. There are other pigments in leaves as well, such as the flavonols (yellow) and, of course, chlorophyll (green). Flavonols, and the colorless (to us) flavonoid pigments, not only affect the color caused by primary pigments (co-pigmentation), but by absorbing ultraviolet light they also are readily seen by insects. \n\nIt is the insects and other pollinators, such as moths, for whom flower colors really exist, not for our pleasure. Pollination, and subsequent fruit production, is the main purpose of most flowers. A bee balm (Monarda) that appears red to us, may appear white to an insect. Or what are white and yellow flowers to us may appear light blue to insects. \n\nEver wonder why some flowers such as lungworts (Pulmonaria), forget-me-nots (Myosotis), or other members of the Borage family seem to change color from pink to blue? Other flowers such as larkspur (Delphinium) also may exhibit these changes. This usually indicates to insects that a flower has aged and is past pollination, so move on! \n\nMany flowers may not change color on an individual plant, but may change color, even if slightly, among locations or various conditions. Temperature affects color, hence, there are often more vivid colors in cool northern gardens than hot summer ones. Plant stress, such as from drought, insect attack, or plant nutrition (too much or little) also can cause different levels of pigments in flowers, and. as a result, different colors. \n\nSo the next time you look at flowers in your garden, a catalog, or in a book, think about all those unseen chemicals that cause the color. Think, too, about who in the insect world these flower colors are designed to attract, and what colors they may be seeing!
1101816
Why is the Sun yellow? \nIt isn't, really. The color yellow is a purely human interpretation of a collection of radiation that hits the retinae of our eyes and gets processed by our visual cortex. \nAnimals seem to have some analogous way of discriminating light by some kind of 'coloration' sense, but we have no way to know if their brains actually 'see' the same thing we do when they look at 'yellow' light. Color detection is caused by photosensitive cells called 'cones', and some animals have none of these and would see the Sun as, presumably some shade of grey since there retinae have the black-white sensitive 'rods' instead, and which have a greater light sensitivity.
378587
the color change that paper undergoes overtime can be traced to the substances that make up its raw materials. since paper comes from trees, you can expect that it contains cellulose, or the complex carbohydrate (polysaccharride) and the polymer which cements the cellulose molecules together, lignin. lignin is a complex carbohydrate which makes tree trunks and branches sturdy and hard. \n\nthe exposure of lignin to sunlight and air is what turns the paper yellow. when lignin oxidizes it begins to become more and more unstable. it then absorbs more light which in turn causes lignin to emit a darker color.
986566
Hello friend.. \nHope you have heard of chlorophyll and other colouring (pigments) agents naturally present in plant leaves.Chlorophyll is the chief chemical helping reactions that finally end up in production of starchy food in plants. \nThese chlorophylls themselves break down and  are being continually used up in the food-manufacturing process. \nBut while the plant grows the plant resynthesizes this pigment and  leaves seem green.\nBy the end of  summer, cells called cork cells, which are degenerate products, get accumulated in the base of the leaf-stump. This results in blockage of water transport to leaves through their "veins".  Chlorophyll from then on degenerates and breaks down. \n    In the fall (autumn as we call it here), seasonal changes slow down the rate of  chlorophyll-synthesis.\nCarotenoids which are another group of pigments present in leaves become clearly visible through these leaves devoid of Chlorophyll. Light is not needed in order for a plant to produce carotenoids, therefore these pigments are always present in a living plant. Aspen, Black Cherry, Sycamore,  Maple and  Poplar are some of the trees famous for their pictureque beauty in Autumn. Carotenoids appear in colours ranging from Brown or red to yellow depending on its concentration in these leaves.  Examples of carotenoids found in leaves include lycopene, which is red, and xanthophyll, which is yellow.  When found naturally, carotenoids give colour to carrots, beetroot, and a number of plant and animal produces like mango, banana egg yolks etc.\nBesides these natural Carotenoids, there are a group of pigments called Flavanoids that appear in the leaves only during autumn. Examples of flavonoids include flavone and flavol, which are yellow, and the anthocyanins, which may be red, blue, or purple, depending on pH (strawberry, apple,  cherry etc..)Anthocyanins are the chief agents among these flavanoids. They are a result of degeneration of sugar moieties in leaves. In autumn, as a plan to prevent losing precious minerals, ions and vitamin-enzymes through falling leaves, these chemicals are transported into the trunk/stem of the plant. But Carbohydrates, being complex molecules aren't transpoted to the main stem/trunk. The transport of ions back into stem causes a  fall in the phosphate concentration in the leaves,which in turn triggers production of Anthocyanins. This process is dependent on physical influences like soil-acidity and brightness of Sun light. Brighter, the days, brighter the colour of autumn leaves and vice versa.\nLeaves containing primarily anthocyanins will appear red. Leaves with good amounts of both anthocyanins and carotenoids will appear orange. Leaves with carotenoids but little or no anthocyanins will appear yellow. In the absence of these pigments, other plant chemicals also can affect leaf color. An example includes tannins, which are responsible for the brownish color of some Oak leaves. \nHope that clears your doubt.\nbye..
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;-)
621260
Try a seed and a fully open flower. Obviously this flower has grown, but you can say that what you came to the class knowing was just the basics..like the seed, and as the class went on, your learning grew more and now you know much more about it, like the open flower..what color it is, how big it is, what it looks like on the inside..etc.
674370
The simplest way to explain it to a 9 year-old would be simply to say that the blue sky is actually sunlight - but all of the colours of light from the sun can pass through the air except blue, and that the sun scatters this blue light in all directions so that you see blue wherever you look.  This is also the reason why the sun appears yellow - in reality it is white because when you mix all colours together you get white - but when you take the blue light out and scatter it all over the sky, then all of the remaining colors add to give you bright yellow.
800111
pink or yellow roses.