ÇÄÇÄ»° Íøµê ºÃÓÑ ÐÅÏ¢ Ìû×Ó¼¯ תÕÊ ÒýÓà »Ø¸´ ²©¿Í ²¿Âä ÊÕ²Ø	¾«¼ò°æ Â¥Ö÷

¡¾Earth & Sky¡¿2006-09-17 ¡¡¡¡¡¡¡¡¡¡ ¡¡¡¡¡¡¡¡¡¡ ÏÂÔØmp3 ¡¡¡¡¡¡¡¡¡¡ÉÏÒ»ÆÚ¡¡¡¡¡¡¡¡¡¡¡¾Earth & Sky¡¿×¨À¸½ÚÄ¿µ¥ ½ÚÄ¿²ÎÓ뷽ʽ£º È«ÎÄÌýд£¨Ô¼1·Ö30Ã룩£¬Çë×¢Ã÷¡°Homework¡±¡£ Ð޸ıðÈËÌýд¸å£¬Çë×¢Ã÷¡°On sb. ¡±²ÉÓá°½×ÌÝʽÐ޸ġ±£¬Ð޸Ĵ¦±êºìÉ«£¬²»È·¶¨´¦±êÀ¶É«¡£ ²ÎÓëÌýд¡¢Ð޸Ľ±Àø 100HY . ---------------------------------------------------------- ²Î¿¼Îı¾£ºWhy do tree leaves turn red in fall? This is Earth and Sky. In the fall, the leaves of some trees turn yellow, orange or red. The bright colors are wonderful to behold. But do they have some hidden purpose? Bill Hoch is a plant physiologist at the University of Wisconsin. He's especially interested in red leaves. I mean, it sort of flies in the face of biology in that, you know, nature is very efficient and it doesn't do something for no reason. And so we figured there had to be some purpose for the production of these pigments in autumn. For much of the year, green leaves help convert sunlight into food. In the fall, trees break down the green pigments and nutrients stored in the leaves. As the leaves of the tree begin to change, nutrients are shuttled into the roots for reuse in the spring. Hoch suspected that some trees produce red pigments as a kind of sunscreen, protecting leaves from sunlight while the tree stores nutrients. To find out, he conducted an experiment with plants that produce red pigments, and other plants of the same species with a defective gene preventing them from making the color red. He found that the plants without red pigments were more damaged by fall sunlight, and couldn't recover leaf nutrients as effectively. Other researchers are doing experiments to see if the red pigments in autumn leaves have other benefits -- such as protecting trees from insects. Meanwhile, Hoch is now searching for other ways trees protect themselves. That's our show. We are Block and Byrd for Earth and Sky. [´ËÌù×ÓÒѾ­±»×÷ÕßÓÚ2006-10-27 10:47:07±à¼­¹ý]

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Why do tree leaves turn red in fall? Yellow and orange pigments -- called carotenoids -- are always in tree leaves, but for most of the year, they're masked by green pigments that help convert sunlight into food. In the fall, trees break down the green pigments and nutrients stored in the leaves. The nutrients are then shuttled into the roots for reuse in the spring. This process reveals the yellow pigments. (Kristen Benavides) ÒѾ­½±Àø cxyf413,Óô³Á,gfyjy,zjsh,mobydick,gsg123,wenbin186,rain_802 µ¥¸öÓû§²Ù×÷£º½ðÇ®100 [´ËÌù×ÓÒѾ­±»×÷ÕßÓÚ2006-10-26 9:49:05±à¼­¹ý]

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This is Earth and Sky. In the fall, the leaves of some trees turn yellow orange or red. The bright colors are wonderful to be hold. but do they have some hidden purpose ? Bill * , a plant physiologist said the university was consent. He is expecially interested in red leaves. * in the face of biology, you know, nature is very efficient and doesn't do something for no reason. So we figure out there has to be some purpose or the production of this pigment in autumn. For much of the year, green leaves help convert sunlight in the food. In the fall, trees break down the green pigments and nutrients stored in the leaves. As the leaves of the tree begin to change, new trees are shuttled into the roots for reuse in the spring. * affected that some trees produce red pigments in the kind of sunscreening. Protecting leaves from sunlight while the tree stores nutrients. To find out he conducted an experiment with plants that produce red pigments. And other plants of the same species with the diffective gene proventing them from making the color red. He found that the plants without red pigments were more damaged by fall sunlight, and * recovered new trees as effectively. Other researchers are doing experiments to see if red pigments in autumn leaves have other benefits , such as protecting trees from insects. Meanwhile, * are now searching for other ways trees protect themselves. That's our show. We are Block and Byrd for Earth and Sky. [´ËÌù×ÓÒѾ­±»×÷ÕßÓÚ2006-9-16 13:18:38±à¼­¹ý]

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On cxyf413 This is Earth and Sky. In the fall, the leaves of some trees turn yellow orange or red. The bright colors are wonderful to be hold. but do they have some hidden purpose ? Bill ? is a plant physiologist at the University of ?. He's especially interested in red leaves. I mean, ? in the face of biology in that nature is very efficient and it doesn't do something for no reason. So we figured there had to be some purpose for the production of these pigments in autumn. For much of the year, green leaves help convert sunlight into food. In the fall, trees break down the green pigments and nutrients stored in the leaves. As the leaves of the tree begin to change, nutrients are shuttled into the roots for reuse in the spring. ? suspected that some trees produce red pigments as a kind of sunscreening, protecting leaves from sunlight while the tree stores nutrients. To find out he conducted an experiment with plants that produce red pigments. And other plants of the same species with a defective gene preventing them from making the color red. He found that the plants without red pigments were more damaged by fall sunlight, and couldn't recover leaf nutrients as effectively. Other researchers are doing experiments to see if the red pigments in autumn leaves have other benefits, such as protecting trees from insects. Meanwhile, ? is now searching for other ways trees protect themselves. That's our show. We are Block and Byrd for Earth and Sky. [´ËÌù×ÓÒѾ­±»×÷ÕßÓÚ2006-9-16 14:16:24±à¼­¹ý]

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On Óô³Á This is Earth and Sky. In the fall, the leaves of some trees turn yellow, orange or red. The bright colors are wonderful to be hold. but do they have some hidden purpose ? Bill Hawk is a plant physiologist at the University of Wisconsin. He's especially interested in red leaves. I mean, certainly flys in the face of biology in that,you know, nature is very efficient and itɾ doesn't do something for no reason. So we figured there had to be some purpose for the production of these pigments in autumn. For much of the year, green leaves help convert sunlight into food. In the fall, trees break down the green pigments and nutrients stored in the leaves. As the leaves of the tree begin to change, nutrients are shuttled into the roots for reuse in the spring. Hawks suspected that some trees produce red pigments as a kind of sunscreening, protecting leaves from sunlight while the tree stores nutrients. To find out he conducted an experiment with plants that produce red pigments. And other plants of the same species with a defective gene preventing them from making the color red. He found that the plants without red pigments were more damaged by fall sunlight, and couldn't recover leaf nutrients as effectively. Other researchers are doing experiments to see if the red pigments in autumn leaves have other benefits, such as protecting trees from insects. Meanwhile, Hawk is now searching for other ways trees protect themselves. That's our show. We are Block and Byrd for Earth and Sky.

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on gfyjy This is Earth and Sky. In the fall, the leaves of some trees turn yellow, orange or red. The bright colors are wonderful to be hold. but do they have some hidden purpose? Bill Hawk is a plant physiologist at the University of Wisconsin. He's especially interested in red leaves. I mean, it's sort of flys in the phase of biology in that,you know, nature is very efficient and it/ doesn't do something for no reason. And so we figured there had to be some purpose for the production of these pigments in autumn. For much of the year, green leaves help convert sunlight into food. In the fall, trees break down the green pigments and nutrients stored in the leaves. As the leaves of the tree begin to change, nutrients are shuttled into the roots for reuse in the spring. Hawks suspected that some trees produce red pigments as a kind of sunscreens, protecting leaves from sunlight while the tree stores nutrients. To find out he conducted an experiment with plants that produce red pigments. And other plants of the same species with a defective gene preventing them from making the color red. He found that the plants without red pigments were more damaged by fall sunlight, and couldn't recover leaf nutrients as effectively. Other researchers are doing experiments to see if the red pigments in autumn leaves have other benefits, such as protecting trees from insects. Meanwhile, Hawk is now searching for other ways trees protect themselves. That's our show. We are Block and Byrd for Earth and Sky.

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on zjsh This is Earth and Sky. In the fall, the leaves of some trees turn yellow, orange or red. The bright colors are wonderful to behold, but do they have some hidden purpose? Bill Hawk is a plant physiologist at the University of Wisconsin. He's especially interested in red leaves. I mean, it's sort of flies in the face of biology in that, you know, nature is very efficient and it/ doesn't do something for no reason. And so we figured it had to be some purpose for the production of these pigments in autumn. For much of the year, green leaves help convert sunlight into food. In the fall, trees break down the green pigments and nutrients stored in the leaves. As the leaves of the tree begin to change, nutrients are shuttled into the roots for reuse in the spring. Hawks suspected that some trees produce red pigments as a kind of sunscreen/, protecting leaves from sunlight while the tree stores nutrients. To find out he conducted an experiment with plants that produce red pigments. And other plants of the same species with a defective gene preventing them from making the color red. He found that the plants without red pigments were more damaged by fall sunlight, and couldn't recover leaf nutrients as effectively. Other researchers are doing experiments to see if the red pigments in autumn leaves have other benefits, such as protecting trees from insects. Meanwhile, Hawk is now searching for other ways trees protect themselves. That's our show. We are Block and Byrd for Earth and Sky.

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Homework This is Earth and Sky. In the fall, the leaves of some trees turn yellow, orange or red. The bright colors are wonderful to behold, but do they have some hidden purpose? Bill Hoker is a plant physiologist at the University of Wisconsin. He's especially interested in red leaves. I mean, it sort of flies in the face of biology in that nature is very efficient and it doesn't do something for no reason. So we figured there had to be some purpose for the production of these pigments in autumn. For much of the year, green leaves help convert sunlight into food. In the fall, trees break down the green pigments and nutrients stored in the leaves. As the leaves of the tree begin to change, nutrients are shuttled into the roots for reuse in the spring. Hoch suspected that some trees produce red pigments as a kind of sunscreen, protecting leaves from sunlight while the tree stores nutrients. To find out he conducted an experiment with plants that produce red pigments. And other plants of the same species with a defective gene preventing them from making the color red. He found that the plants without red pigments were more damaged by fall sunlight and couldn't recover leaf nutrients as effectively. Other researchers are doing experiments to see if the red pigments in autumn leaves have other benefits, such as protecting trees from insects. Meanwhile, Hawk is now searching for other ways trees protect themselves. That is our show. We are Block and Byrd for Earth and Sky.

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This is Earth&Sky. In the fall,the leaves of some trees turn yellow,orange,red.The bright colours are wonderful to hold.But do they have some hidden purpose? Bill Haffice,the plant physiologist**University was consent.He is especially interested in the red leaves. "***in face of biology and you know natures are efficient and doesn't do something for no reason." Have some purpose for the production of these pigments in autumn.For much of the year green leaves help convert sunlight into the foods.In the fall trees break down the green pigments and nutrition stored in new leaves as the leaves of the tree begin to change.New trees are shuttle into the roots for reuse in spring.Some trees produce red pigments as a kind of sunscreen protecting leaves from sunlight while the trees store nutritions. To find out he conducted an experiment with plans as to produce red pigments.And the other plans of the same species with defective genes preventing them from making the colour red.He found the plants without the red pigments were more damaged by fall sunlight. And could recover leaf nutrition as effectively.Other researchers are doing experiments to see if red pigments in autumn leaves have other benifits,such as protecting trees from insects. Meanwhile hocks are now searching for other ways trees protect themselves.That is our show.We are Block and Byrd for Earth&Sky.

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Homework This is Earth and Sky. In the fall the leaves of some trees turn yellow orange or red.The bright colors are wonderful to behold. but do they have some hidden purpose? Bill Hoker is a plant physiologist said in the university of Wisconsin. He is especially interested in red leaves. "It means certain flies there in the face of biology, and that, you know natures is efficient and it doesn't do something for no reason, so we figured to have some purpose for, the production of these pigments in autumn." For much of the years, green leaves help to convert sunlight into food, and fall trees break down the green pigments and nutrients stored in the leaves, as the leaves of the tree begin to change, nutrients shuttled into the roots for reuse in the spring. Hoker suspected that some trees produce red pigments have a kind of sun scream protecting leaves from the sunlight for the trees store the nutrients. To find out he conducted an experiment with plaints that produce red pigments. Another plants of the same species with a defective gene preventing them from making the color red. He found that the plants without red pigment were more damaged by fall sunlight, and couldn't recover with nutrients and effectively. Other researchers are doing experiments to see if the red pigments in autumn leaves have other benefits, such as protecting trees from insects. Meanwhile, Hoker is now searching for other ways trees protect themselves. That is our show, we're Block and Bird from Earth and Sky.

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on mobydick This is Earth and Sky. In the fall, the leaves of some trees turn yellow, orange or red. The bright colors are wonderful to behold. But do they have some hidden purpose? Bill Hoch is a plant physiologist at the University of Wisconsin. He's especially interested in red leaves. I mean, it/ sort of flies in the face of biology in that, you know, nature is very efficient and it doesn't do something for no reason. And so we figured there had to be some purpose for the production of these pigments in autumn. For much of the year, green leaves help convert sunlight into food. In the fall, trees break down the green pigments and nutrients stored in the leaves. As the leaves of the tree begin to change, nutrients are shuttled into the roots for reuse in the spring. Hoch suspected that some trees produce red pigments as a kind of sunscreen, protecting leaves from sunlight while the tree stores nutrients. To find out, he conducted an experiment with plants that produce red pigments, and other plants of the same species with a defective gene preventing them from making the color red. He found that the plants without red pigments were more damaged by fall sunlight, and couldn't recover leaf nutrients as effectively. Other researchers are doing experiments to see if the red pigments in autumn leaves have other benefits -- such as protecting trees from insects. Meanwhile, Hoch is now searching for other ways trees protect themselves. That's our show. We are Block and Byrd for Earth and Sky.

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Collins: If an action or belief flies in the face of accepted ideas or rules, it seems to completely oppose or contradict them. ...scientific principles that seem to fly in the face of common sense...

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