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Origin of photosynthesisModL: see photo- and synthesis

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A. sunlight is absorbed by chlorophyll in a leaf

How can scientists exploit photosynthetic organisms to generate compounds that we can use as fuel? One big step has been the sequencing of genomes (sets of encoded genetic information) of many photosynthetic organisms. These sequenced genomes allow scientists to more easily compare the different photosynthetic machinery in different organisms. Furthermore, knowing the sequence makes it easier when they try to modify the genomes of these organisms.

B. carbon dioxide is taken in from the air

Current research on photosynthesis has the potential to substantially change the way that we as humans live. Imagine a world where cheap and efficient energy was the standard for everyone. Cheap fuel would sure make road trips (or even flying!) more affordable. The possibilities are endless…if only it would help you buy your own set of wheels!

C. water is transported from the roots

D. glucose is synthesized and distributed throughout the plant

Why would scientists want to modify the genomes of organisms that have evolved over millions of years to perfect photosynthesis? Because, they are crazy and crave massive failure. Just kidding. The reason is that, while these organisms have evolved to better fit into their own environments, these evolved traits are not necessarily the best traits for generating fuel for humans. It's always about us, isn't it? Scientists can look for mutants that have useful changes in particular photosynthetic pathways, or they can try to create changes themselves by a wide variety of molecular and genetic techniques. In one instance, scientists have been able to generate mutants in the algae C. reinhardtii that have a defect in electron transfer around Photosystem I. The result is an increased production of hydrogen gas (H2), a clean and efficient energy source. Other mutants have been identified that increase the amount of carbon stored either as lipids or carbohydrates.

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.

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The definition of photosynthesis is the process through which plants use water and carbon dioxide to create their food, grow and release excess oxygen into the air.

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.

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    Photosynthesis — bozemanscience

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  • Low light intensity lowers the rate of photosynthesis

    As the intensity is increased the rate also increases

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LabBench Activity Plant Pigments and Photosynthesis

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.

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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.

Symposium | Tropical Agriculture Conference

photosynthesis A. sunlight is absorbed by chlorophyll in a leafB. carbon dioxide is taken in from the airC. water is transported from the rootsD. glucose is synthesized and distributed throughout the plantE. oxygen is released

Chapter 2 - Energy conversion by photosynthetic …

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.

School of Sciences • Science Degrees | CBU

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 Urea Fertilizer: Description and Application

photosynthesis A. sunlight is absorbed by chlorophyll in a leafB. carbon dioxide is taken in from the airC. water is transported from the rootsD. glucose is synthesized and distributed throughout the plantE. oxygen is released

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