Photosynthesis - Part I: Even the light that does make it here is reflected and spread out. The little light that does make it here is enough for the plants of the world to survive and go through the process of photosynthesis. Light is actually energy, electromagnetic energy to be exact.
This is where the color comes from. The outer surface is called the thylakoid membrane or the photosynthetic membrane.
The pigment and ATP Synthetase molecules Where does photsynthesis take place on the thylakoid membrane. Inside the membrane is the thylakoid space.
Scientists generally break photosynthesis into two stages, the light reactions and the dark reactions. The light reactions, which are also called light dependent because they depend on light or energy fixing because they capture and make energy available for the process reactions, take place in the thylakoid space and the thylakoid membrane.
Click on the underlined links for more info and definitions. There are no little blue men in the stroma. This picture shows three thylakoids stacked one on top of the other. A stack of thylakoids is called a granum.
More than one granum are grana. Apparantly, the little green specks you see when you look at stacks of thylakoids through a microscope, reminded someone of "grains" of something.
The first stage of photosynthesis takes place in the thylakoid membrane and the thylakoid space. The various types of chlorophyll and carotenoid molecules are the pigments placed in the membrane. These pigments start the process by acting sort of like antennae that capture the solar energy.
Light photons hit the chlorophyll or carotenoid molecules. This photon energy "knocks loose" an electron which provides the energy to other molecules to start the very complicated and fascinating photosynthesis process.
What happens to the chlorophyll molecules? This is where the water comes in.
There is a special enzyme molecule with the specific job of breaking apart water molecules. This procedure is called the photolysis of water. Water molecules are broken down into oxygen and hydrogen atoms. The hydrogen atoms are further broken down into a hydrogen ion and an electron.
Guess where the electrons go. They go to the chlorophyll and other pigment molecules where they replace the missing electrons "knocked" loose by photons of light.
Guess where the oxygen atoms go. For the most part, they just go out! They link up with another oxygen molecule to form O2, then they flow back out to the air from whence they came.
It comes from the oxygen in water molecules H2O and is just an unwanted byproduct as far as photosynthesis is concerned. The electrons and hydrogen ions are used, and some of the oxygen may get used for respirationbut a lot of them just go back out to the atmosphere where you and I may breath them with our very own gas exchange systems.
The hydrogen ions left behind stay for a very short while in the thylakoid space. This space is often referred to as the hydrogen reservoir because it is a reservoir for hydrogen ions - nice and straight forward, eh? Darn sight easier to remember than thylakoid space.
The hydrogen ions go zipping out of the thylakoid space, flowing through special channels in the membrane.
ATP adenosine triphosphate and another molecule abbreviated NADPH too big of a name to write are the two energy carrying molecules that power the dark reactions not to be confused with the dark side of the Force that powered Darth Vader of photosynthesis Part 2 occuring in the stroma.
There is also a steady flow of electrons, from the water, through various steps through the membrane, and finally to NADPH. This electron flow is an electric current - electricity powered by solar energy. There is more, much more, but you get the idea. A lot is going on in a leaf. Basically, in step one, the light reactions, the energy of light is captured and transferred into ATP and NADPH, which are used to provide energy for the making of carbohydrates in stage two of photosynthesis, the carbon cycle.Sri Lanka plant names in Sinhala, tamil, botany, ethnobotany, etymology, computer science sinhala glossary links to place names, old and new maps, philological, historical and sociological notes, links to .
Photosynthesis takes place inside plant cells in small things called chloroplasts. Chloroplasts (mostly found in the mesophyll layer) contain a green substance called chlorophyll.
Below are the other parts of the cell that work with the chloroplast to make photosynthesis happen. Photosynthesis, a plant's internal process that converts light energy into food, takes place mostly in the leaves of plants.
Plants and trees utilize specialized structures to conduct the chemical reactions necessary to transform sunlight into chemicals the plant can use. Mar 25, · Photosynthesis occurs in the chloroplasts which is where the actual green pigment hangs out in the cells of green plants.
More specifically, the chloroplasts contain stacks of disk-shaped thylakoids, where the physical light-dependent reactions take place. Photosynthesis is a process in which light energy is used to produce sugar and other organic compounds.
Learn how plants turn sunlight into energy. The light reactions take place in the presence of light. The dark reactions do not require direct light, however dark reactions in most plants occur during the day.
How does photosynthesis work? Light energy is converted to chemical energy during the two main stages of photosynthesis: The Light-dependent Reactions and the Calvin Cycle.
Most of the reactions involved in the process of photosynthesis take place in the leaves. The diagram below shows the cross section of a typical plant leaf.