During the calvin cycle
calvin cycle
Carbon atoms are fixed into organic compounds in The Calvin Cycle.
compounds
From CO2 in the atmosphere which is fixed into organic matter in photosynthesis.
Carbon fixation is the process by which carbon from carbon dioxide is incorporated into organic compounds.Specifically, fixation describes a conversion from inorganic to organic. The process is carried out by living organisms. Organisms known as autotrophs - e.g., plants - will grow by conducting carbon-fixing photosynthesis. Others known as heterotrophs - e.g., animals - will grow by using an autotroph's fixed carbon.
Atoms of elements combine in fixed ratios will form compounds.
fixed carbon is carbon content of the coal/biomass which is not easily decomposed or combusted at lower temperatures(>200 c), and total carbon content of coal/biomass is volatile carbon present in form of other hydrocarbons forms like volatile organic compounds, etc.. which easily combusted at little higher temperatures (>50 c)
The carbon and oxygen atoms in carbon dioxide are strongly attracted to each other, and carbon dioxide in the air will only break up into separate carbon and oxygen atoms at very high temperatures, higher than the temperatures usually found in nature on earth. In green plants, however, a chemical called chlorophyll in the cells of the plants can use the energy of light (usually sunlight) to break apart the carbon dioxide into carbon and oxygen, even at ordinary temperatures. The oxygen is released into the air, and the carbon is combined with other elements to create sugars, starches, cellulose, and other organic compounds that become part of the plant.
Atoms of elements have a fixed number of electrons that can bond with other atoms. Carbon has 4 electrons that can bond with other atoms. So 4 hydrogen atoms can bond with one carbon atom.
it is called a fixed composition
C4 pathways has enzymes that can fix CO2 into 4 Carbon compounds even when the CO2 is low and the O2 is high. Those 4 Carbon compounds are then transported to other cells where the CO2 is released and enters the Calvin Cycle.
A chemical compound that has a set number of atoms for each element. E.g. water H2O has the fixed ratio of 2:1, that is 2 hydrogen atoms to 1 oxygen atom, carbon dioxide CO2 has a fixed ratio of 1:2 (1 carbon atom to 2 oxygen atoms). It has to be fixed as if it isn't it makes a new compound/chemical.