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photosynthesis notes - Biology Junction

Carbon dioxide is captured in a cycle of reactions known as the Calvin cycle or the Calvin-Benson cycle after its discoverers. It is also known as just the C3 cycle. Those plants that utilize just the Calvin cycle for carbon fixation are known as . Carbon dioxide diffuses into the stroma of chloroplasts and combines with a five-carbon sugar, ribulose1,5-biphosphate (). The enzyme that catalyzes this reaction is referred to as , a large molecule that may be the most abundant organic molecule on the Earth. This catalyzed reaction produces a 6-carbon intermediate which decays almost immediately to form two molecules of the 3-carbon compound 3-phosphoglyceric acid (). The fact that this 3-carbon molecule is the first stable product of photosynthesis leads to the practice of calling this cycle the C3 cycle.

This process is extremely important for life on earth as it provides the oxygen that all other life depends on.


Just like humans and other living things, plants also need this food for many things. Let's see a few:

Glucose resulting from photosynthesis is used during respiration to release energy that the plant needs for other life processes.

The plant cells also convert some of the glucose into starch for storage. This can then be used when the plant needs them. This is why dead plants are used as biomass, because they have stored chemical energy in them)

Glucose is also needed to make other chemicals such as proteins, fats and plant sugars that are all needed for the plant to carry out essential growth and other life processes.

Photosynthesis in plants and a few bacteria is responsible for feeding nearly all life on Earth

plant | Definition, Evolution, Ecology ..

23/12/2017 · Photosynthesis is the process by which plants produce the sugarsused as food. Three pieces are needed: Carbon dioxide and water asingredients, and …

More than 10 billion tons ofcarbons are "fixed" by plants on Earth every year- this means that carbon molecules are convertedfrom being part of a simple gas (carbon dioxide)into more complex molecules (carbohydrates),making carbon available as food fornon-photosynthesizers, like humans. They alsoproduce oxygen at the same time. Take a look at atree - most of the mass of that tree was made bythis process of pulling the carbon out of the gasform and into the sugar form. Amazing!

Sunlight provides energy in the form ofelectromagnetic radiation. Sunlight is actuallymade up of photons, which are very small particlesthat carry electromagnetic force. In the firststep of photosynthesis, the plants capture aphoton and harness its energy in order to startphotosynthesis. During photosynthesis, the plantstake carbon dioxide (which is present throughoutthe air) and water (which is also in the air anddirt) and turn it into sugar, among othercompounds. Plants also produce oxygen duringphotosynthesis. (This is a lucky process for usbecause we produce carbon dioxide and breathe inoxygen -- without plants, we'd be in a lot oftrouble!)Amazingly, some animals have beenfound that also do photosynthesis. I recentlywrote an article on such an animal -- here is thelink if you're interested (it also talks moreabout photosynthesis):

types of photosynthesis in plants

Sunlight provides energy in the form ofelectromagnetic radiation. Sunlight is actuallymade up of photons, which are very small particlesthat carry electromagnetic force. In the firststep of photosynthesis, the plants capture aphoton and harness its energy in order to startphotosynthesis. During photosynthesis, the plantstake carbon dioxide (which is present throughoutthe air) and water (which is also in the air anddirt) and turn it into sugar, among othercompounds. Plants also produce oxygen duringphotosynthesis. (This is a lucky process for usbecause we produce carbon dioxide and breathe inoxygen -- without plants, we'd be in a lot oftrouble!)

Chapter 3 section 3 and 4 Flashcards | Quizlet

Polar forests reappeared in the Eocene after the , and the Eocene’s was the Cenozoic’s warmest time and . Not only did alligators live near the North Pole, but the continents and oceans hosted an abundance and diversity of life that Earth may have not seen before or since. That ten million year period ended as Earth began cooling off and headed toward the current ice age, and it has been called the original Paradise Lost. One way that methane has been implicated in those hot times is that leaves have , which regulate the air they take in to obtain carbon dioxide and oxygen, needed for photosynthesis and respiration. Plants also lose water vapor through their stomata, so balancing gas input needs against water losses are key stomata functions, and it is thought that in periods of high carbon dioxide concentration, . Scientists can count stomata density in fossil leaves, which led some scientists to conclude that carbon dioxide levels were not high enough to produce the PETM, so that produced the PETM and , and the controversy and research continues.

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Why do plants need water, light, and carbon dioxide ..


Carbon dioxide is produced during the processes of decay ..

When a seed germinates into a sapling, the stored reservoirs of energies are used up by the sapling. The plant must create its own energy in order to survive. Photosynthesis is the process by which new lease of energy is made available to the plant. For photosynthesis, plants need light, water, carbon dioxide and chlorophyll. The chlorophyll converts water from soil and carbon dioxide from air into oxygen and sugar in the presence of sunlight.

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