Articles

Articles

You are going to read a science related article.

1.) You will click on the link below. Hightlight all the article text and paste it to your article page.

[] 2.) Read the text completely through once to gain an overall understanding of the article. 3.) The second time you read, you will investigated a little closer. As you read the article through this time you will need to __complete__ the following:
 * Find unfamiliar content words and turn them green.
 * Sentences that hold the main __idea__ of important facts turn them orange.
 * After each paragraph, write a summary of what the paragraph was mostly about.
 * Answer the following questions:

The chlorophyll is less stable because it breaks down while the Carotenoids stay. OK  When there's less light in a day. OK  The leaves change color because of the little bit of sun and because the suns been out longer. OK
 * How do we know that Carotenoids are more stable compounds than chlorophyll?**
 * How does nature signal it's time for leaves to change color?**
 * How would you explain the reason the leaves changing colors and falling off so late this year?**

**The Splendor of Autumn** Every autumn we revel in the beauty of the fall colors. The mixture of red, purple, orange and yellow is the result of chemical processes that take place in the tree as the seasons change from summer to winter.During the spring and summer the leaves have served as factories where most of the __foods__ necessary for the tree's growth are manufactured. This food-making process takes place in the leaf in numerous cells containing chlorophyll, which gives the leaf its green color. This extraordinary chemical absorbs from sunlight the energy that is used in transforming carbon dioxide and water to carbohydrates, such as sugars and starch.Along with the green pigment are yellow to orange pigments, carotenes and xanthophyll pigments which, for example, give the orange color to a carrot. Most of the year these colors are masked by __great__ amounts of green coloring. __Cell__ processes cause the colors on leaves and leaves make food for the tree. But in the fall, because of changes in the length of daylight and changes in temperature, the leaves __stop__ their food-making process. The chlorophyll breaks down, the green color disappears, and the yellow to orange colors become visible and give the leaves part of their fall splendor.At the same time other chemical changes may occur, which __form__ additional colors through the development of red anthocyanin pigments. Some mixtures give rise to the reddish and purplish fall colors of trees such as dogwoods and sumacs, while others give the sugar maple its brilliant orange.The autumn foliage of some trees show only yellow colors. Others, like many oaks, display mostly browns. All these colors are due to the mixing of varying amounts of the chlorophyll residue and other pigments in the leaf during the fall season. Leaves stop making food in the fal l and chlorophyll breaks down. As the fall colors appear, other changes are taking place. At the point where the stem of the leaf is attached to the tree, a __special__ layer of cells develops and gradually severs the tissues that __support__ the leaf. At the same time, the tree seals the cut, so that when the leaf is finally blown off by the wind or falls from its own weight, it leaves behind a leaf scar.Most of the broad-leaved trees in the North shed their leaves in the fall. However, the dead brown leaves of the oaks and a few other species may stay on the tree until growth starts again in the spring. In the South, where the winters are mild, some of the broad-leaved trees are evergreen; that is, the leaves stay on the trees during winter and keep their green color. Some trees lose leaves earlier. Most of the conifers - pines, spruces, firs, hemlocks, cedars, etc. - are evergreen in both the North and South. The needle- or scale-like leaves remain green or greenish the year round, and individual leaves may stay on for two to four or more years. Some trees are the same in the north and south Temperature, light, and water supply have an influence on the degree and the duration of fall color. Low temperatures above freezing will favor anthocyanin formation producing bright reds in maples. However, early frost will weaken the brilliant red color. Rainy and/or overcast days tend to increase the intensity of fall colors. The best time to enjoy the autumn color would be on a clear, dry, and cool (not freezing) day.Enjoy the color, it only occurs for a brief period each fall. Temperature can cause fall colors
 * Chlorophyll Breaks Down**
 * Other Changes Take Place**
 * Only Some** **Trees Lose Leaves**
 * Weather Affects Color Intensity**


 * Student: Jordan Ulett Assignment: ** Why Do leaves Change Color? ** Period: 2 **


 * ** Possible points ** || ** 1 ** || ** 2 ** || ** 3 ** || ** Max ** ** Points ** ** = 3 ** ||
 * ** Questions ** || Answered || Answered completely with errors || Answered with complete sentences accurately || 3 ||
 * ** Summary ** || Described || Described with errors || Described accurately with errrors || 3 ||
 * ** Vocabulary ** || 1term || 2terms || 3+terms || 1 ||
 * ** Total Points ** ||  ||   ||   || 7/9 ||

** Teachers Note: **
 * ** Descent effort. Lets do better on future assignments. **