NOTE: Free essay sample provided on this page should be used for references or sample purposes only. The sample essay is available to anyone, so any direct quoting without mentioning the source will be considered plagiarism by schools, colleges and universities that use plagiarism detection software. To get a completely brand-new, plagiarism-free essay, please use our essay writing service.
One click instant price quote
Photosynthesis is the Photosynthesis PHOTOSYNTHESIS Photosynthesis is the process by which green plants and certain other organisms use the energy of light to convert carbon dioxide and water into the simple sugar glucose. In so doing, photosynthesis provides the basic energy source for almost all organisms. Oxygen is extremely important to photosynthesis, which most organisms depend on. Photosynthesis occurs in green plants, seaweeds, algae, and certain bacteria. Chlorophyll is capable of converting active light energy into a form (glucose) that is stored in food.
The initial phase of the process requires direct light; water (H 2 O) is broken down into oxygen (which is released as a gas) and hydrogen. Photosynthesis, in general, is the reverse of respiration, in which carbohydrates are broken down to release energy. Cellular respiration converts sugar into ATP, which is the fuel used by all living things. Plants are the only photosynthetic organisms to have leaves (and not all plants have leaves). A leaf may be viewed as a solar collector crammed full of photosynthetic cells. The raw materials of photosynthesis, water and carbon dioxide, enter the cells of the leaf, and the products of photosynthesis, sugar and oxygen, leave the leaf.
Water enters the root and is transported up to the leaves through specialized plant cells known as xylem. Carbon dioxide cannot pass through the protective waxy layer covering the leaf (cuticle), but it can enter the leaf through an opening (stomata). Oxygen produced during photosynthesis can only pass out of the through the opened stomata. COMPARSION BETWEEN RESPIRATION AND PHOTOSYNTHESIS Photosynthesis Respiration Where? In chlorophyll bearing-cells In all cells When? In the presence of light All the time Input Carbon dioxide and water Reduced carbon compounds and oxygen Output Reduced carbon compounds, Carbon dioxide and water oxygen, and water Energy Source Light Chemical Bonds Energy Result Energy stored Energy released Chemical Reaction Reduction of Carbon compounds Oxidation of carbon compounds The equation for photosynthesis is: 6 C 1 The chloroplast is the organelle of photosynthesis.
In many ways, the chloroplast resembles the mitochondria. Both are surrounded by a double membrane with an inter membrane space. Both have their own DNA. Both are involved in energy metabolism. Photosynthesis uses most of the energy in sunlight except green wavelengths (color thats reflected). The light reactions occur on thylakoid membranes in plants (similar membranes in protest).
There are two process of photosynthesis dark reaction and light reaction. In a dark reaction it can occur with or without light. They occur in the stroma of chloroplast. The dark reaction requires ATP which is a product of light reaction. The chemical energy required for the light-independent reaction is supplied by the ATP and NADPH molecules produced in the ight-dependent reaction.
The light-independent reaction is cyclic, that is, it begins with a molecule that must be regenerated at the end of the reaction in order for the process to continue. The light-independent reaction requires the presence of carbon dioxide molecules, which enter the plant through pores in the leaf, diffuse through the cell to the chloroplast, and disperse in the stroma. The light-independent reaction begins in the stroma when these carbon dioxide molecules link to sugar molecules called ribose bisphosphate (Ru BP) in a process known as carbon fixation.
Free research essays on topics related to: energy source, carbon, carbon dioxide and water, photosynthesis, green plants
Research essay sample on Carbon Dioxide And Water Green Plants
