落叶是自然界的食物工厂。植物用根从土壤里吸收水分。它们从空气中吸收二氧化碳。植物用光把水和二氧化碳变成葡萄糖。葡萄糖是糖的一种。植物用葡萄糖作为能量和生长所需。植物把水和二氧化碳变成葡萄糖的过程叫做光合作用。意思是‘和光一起’。化学上说叶绿素使得光合作用发生。叶绿素也使得植物呈现绿色。...
The days get shorter, and the night get longer. Trees get less sunlight, so they make less food. The leaves stop making the green colors. Other colors that were under the green start to show. 秋天 秋天,天气变了。 白天变短了,夜晚变长...
Over time, leaves stop making the green chemical. So they lose their green color. When that happens,the hidden orange Yellow And brown colors start to show. Leaves also start making a red color at this time. At night the t...
Why Do Leaves Change Colors? When walking along the street, with rows of trees lined therestill, have you ever noticed the color of the leaves? 当我们走在街上,路边有一排排的树在路边直直的立着。但是你注意过叶子的颜色吗? Leaves on the green plants are green in spring, then becomedarker...
So… Why Do Leaves Change Color? In this science experiment, we used rubbing alcohol and energy (hot water) to separate the colors. You likely saw green and, depending on your leaf type, maybe red, yellow, or orange. As we know, chlorophyll gives leaves their green color and is so dom...
3.(2017·静安·二模)Why do leaves change colour?One of nature's most beautiful (1)is a forest full of bright autumn colors.Imagine making art with all those colors of paint!Leaves in their autumn colors are beautiful. Did you ever wonder why a tree's leaveschange color? To answer this...
1 【题目】 Choose the words of expressions and complete the passage why do leaves (树叶) change colour ? One of nature's most beautiful ___ is a forest full of bright autumn colors . Imagine making art with all those colours of paint! Leaves in their autumn colours are beautiful . Did...
The trees will rest, and live off the food they stored during the summer. They begin to shut down their food-making factories. The green chlorophyll disappears from the leaves. As the bright green goes away, we begin to see yellow and orange colors. Small amounts of these colors have ...
become dominant and show their colors. The timing of the color changes in leaves depends on the species. Some trees such as sourwood in southern forests become vividly colorful in late summer while others change color once autumn starts. The difference in timing is considered to be genetically ...
CChoose the best answer and complete the passage(选择最恰当的选项完成短文)Why do leaves change color?One of nature's most beautiful 1 is a forest full of bright autumn colors. Imagine making artwith all those colors of paint!Leaves in their autumn colors are beautiful. Did you ever wonder...