How is sugar made by photosynthesis in a plant cell?Describe the process of photosynthesis and its outcomes.

Expert Answers
engtchr5 eNotes educator| Certified Educator

Let's look at this one from the most basic perspective possible: Leaves make chlorophyll, which in turn produces cellulose. The way they make chlorophyll is through the process of photosynthesis -- sunlight becoming food for plants. A simple way to think about it is this: Sunlight strikes plants, leaves ingest carbon dioxide and give off oxygen, and water is absorbed into the leaves, roots, or cells themselves. During this process, sugar is created as a byproduct of the photosynthesis.

maria-vivanco | Student

In a plant, the leaves have pigments (chlorophyll) that absorb light and have openings to let  CO2 through called stroma.

Photosynthesis is the process that plant use to trap the suns energy to build glucose as food.  It happens in the chloroplast. It happens in two stages: the light dependent reaction (happens in the thylakoid membrane of the chloroplast) and the Calvin cycle (happens in the stroma)

The equation for photosynthesis is: C02 + H20 -> C6H12O6 + 02

 The light dependent reaction produced ATP and NADPH, energies that are needed to produce glucose (sugar)

The light dependent reaction has these steps: 

1. The light hits the chlorophyll in the thylakoid membrane, which excites electrons and releases enzymes that split H20 into Oxygen ( which is one of the products of photosynthesis and is released) 

2. The electrons are gained by NADP+, an energy in the electron carrier proteins, which are connected a chain called electron transport chain (ETC, we are gonna call it that from now on, since its shorter to type). Since electrons and hydrogens are gained NADP+ is reduced to NADPH. 

3. As energy goes through the ETC, it is lost.The energy will be used by ADP syththase ( an enzyme) to add PHOSPHATE and produce ATP.

The second stage is the Calvin cycle. The Calvin cycle uses the ATP and NADPH to produce carbon. 

The Calvin Cycle goes as following:

1. 3 molecules of CO2 combine w 3 molecules of RuBp to form 6 molecules of the three carbon sugar PGA (this is called carbon fixation because it fixes CO2 gas into an organic compound) [catalyzed by Rubisco]
2. PGA gains phosphate from ATP and be reduced by NADPH to produced 6 molecules of G3P (PGAL)
3. 1 molecules of PGAL leaves chloroplast to the cytoplasm to be involved in the production of gluclose
4. The 5 molecules of G3P will be used to regenerate RuBP (ATP is required)

The Calvin Cycle produced glucose(C6 H12 06)  

rdaugherty | Student

Sugar is made through photosynthesis by a chemical reaction within the plant’s cell.  Photosynthesis takes place in the chloroplast of a cell.  Light is absorbed into the cell by chlorophyll which is located in the chloroplast (an organelle in a plant cell.).  The chemical reaction that produces sugar is powered by the sun’s energy.  Carbon Dioxide, CO2, is absorbed by the plant through the stomata (small openings on the underside of the plants leaves) and water, H20, which is absorbed through the root hairs are combined together in a chemical reaction, which produces glucose, or the sugar that plants use for energy.  The chemical formula for the process is 6CO2 + 6H2O (+ light energy) =C6H12O6 + 6O2.

A cell is like

a storage of needs so the sugar which co2 and h2o carbonixoide and water combine from the sun energy and all together are the food for the leaves of the plant.