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Light-dependent stage of photosynthesis - Flashcards …

Photosynthesis in a leaf: Chloroplasts, Grana, Stroma, and Thylakoids, the starting point for energy's travels through life

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What happens during stage 2 of photosynthesis ..

Sugars created in photosynthesis can be later converted by the plant to starch for storage, or it can be combined with other sugar molecules to form specialized carbohydrates such as , or it can be combined with other nutrients such as nitrogen, phosphorus, and sulfur, to build complex molecules such as and .

Photosynthesis Stage I: The Light Reactions

All of the sugar produced in the photosynthetic cells of plants and other organisms is derived from the initial chemical combining of carbon dioxide and water with sunlight.

The first stage of photosynthesis is called the light reactions

Redox potentials in photosynthesis light dependent stage

It is estimated by the U.S. Forest Service that all the forests in the United States, combined, sequestered approximately 309 million tons of carbon each year from 1952 - 1992, offsetting approximately 25 percent of human-caused emissions of carbon during that period. Over a 50-year lifespan, a tree generates almost $32,000 worth of oxygen, providing $62,000 worth of air pollution control. This tree would also be responsible for recycling $37,500 worth of water and controlling $31,000 worth of soil erosion.

On average, one acre of new forest can sequester about 2.5 tons of carbon annually. Young trees absorb CO2 at a rate of 13 pounds per tree each year. Trees reach their most productive stage of carbon storage at about 10 years at which point they are estimated to absorb 48 pounds of CO2 per year. At that rate, they release enough oxygen back into the atmosphere to support two human beings. Planting 100 million trees could reduce an estimated 18 million tons of carbon per year and consequently save American consumers $4 billion each year on utility bills.

(ATP), two molecules used in the second stage of photosynthesis

Urban forests help to improve our air quality. Heat from the earth is trapped in the atmosphere due to high levels of carbon dioxide (CO2) and other heat-trapping gases that prohibit it from releasing the heat into space. This creates a phenomenon known today as the “greenhouse effect.” Therefore, trees help by removing (sequestering) CO2 from the atmosphere during photosynthesis to form carbohydrates that are used in plant structure/function and return oxygen back into the atmosphere as a byproduct. Roughly half of the greenhouse effect is caused by CO2. Therefore, trees act as carbon sinks, alleviating the greenhouse effect.

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  • sunlight is absorbed by chlorophyll in a leaf B

    Friday, December 10, 2010

  • carbon dioxide is taken in from the air C

    photosynthesis A

  • water is transported from the roots D

    Photosynthesis - Wikipedia

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