Where does photosynthesis take place? | Yahoo Answers
Where does photosynthesis take place?
the way land plants perform photosynthesis does not …
Plant photosynthesis, both the Light Phase and Dark phasereactions, takes place in chloroplasts, which may be regarded asthe "power plants" of the green leaf cells. At night,when there is no sunlight energy, ATP continues to be generatedfor the plant's needs by respiration, i.e., oxidation of(photosynthetically produced) carbohydrate in mitochondria(similar to animals).
We are caught up, as organic beings, in the naturalprocess through which the earth accepts energy from the sun andthen releases it. There has been life on Earth for at least threeand a half billion years, and over this time there has been aclear and constant evolution in the way energy is used. The firstliving things may have obtained energy from organic moleculesthat had accumulated in their environment, but photosyntheticautotrophs, able to capture energy from sunlight, soon evolved,making it possible for life to escape this limited niche. Theexistence of autotrophs made a place for heterotrophs, which useenergy that has already been captured by autotrophs.
Where does all this "photosynthesizing" take place
It is not clear how photosynthesis got started,although it is a combination of two systems that can be foundsingly in some life forms that still exist. But blue-green algae,which are among the earliest organisms documented in the fossilrecord, already employed the two-stage process that waseventually handed down to green plants. This is a complexsequence of events that has a simple outcome. Carbon dioxide (ofwhich there was an abundance in the earth's early atmosphere)reacts with water through energy from light, fixing carbon andreleasing oxygen, and a portion of the energy remains captive aslong as the carbon and the oxygen remain apart. Plants releasethis energy when and where necessary to conduct their metabolicbusiness (Starr & Taggart, 1987).
So we can summarize by saying that the photosynthetic plantstrap solar energy to form ATP and NADPH (Light Phase) and thenuse these as the energy source to make carbohydrates and otherbiomolecules from carbon dioxide and water (Dark Phase),simultaneously releasing oxygen in to the atmosphere. Thechemoheterotrophic animals reverse this process by using theoxygen to degrade the energy-rich organic products ofphotosynthesis to CO2 and water in order to generate ATP fortheir own synthesis of biomolecules.
What Type Of Organism Does Photosynthesis Occur In? …
Carotenoids; are a class of accessory pigments that occur in all photosynthetic organisms such as algae and some types of fungus and bacteria, Xanthophylls; are another class of accessory pigments.
For each electron flowing from water to NADP+ (a net change in1.14 volts), two quanta of light are absorbed, one by eachPhotosystem. Each molecule of oxygen released involves the flowof four electrons from two water molecules to two NADP+s andrequires four quanta of sunlight absorbed by each Photosystem toprovide the energy to do this. These are the "Light PhaseReactions" of photosynthesis, which produce two high energychemical products, namely NADPH and ATP.
11.09.2017 · Where does photosynthesis take place
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Now what are the "Dark Phase Reactions" (aka CalvinCycle)? This is the cycle that converts CO2 into glucose. Sinceit utilizes the chemical energy in the ATP and NADPH, it does notrequire sunlight (hence the name). It is a complex cycle ofmostly phosphorylation (adding or removing phosphate) andoxidative (electron removal) chemical reactions whereby 6molecules of CO2 are converted into one molecule of glucose. Itrequires the energy-releasing cleavage of high energy bonds of 18ATPs and 12 NADPHs . The resulting 18 ADPs and 12 NADP+s are thenrestored by the Light Phase process to their high energy forms(ATP and NADPH).
Science Experiments on Environmental Education and Biology
Starvation, social strife, and disease interact incomplex ways. If famine were the sole mechanism of collapse, thespecies might become extinct quite suddenly. A population thatgrows in response to abundant but finite resources, like thereindeer of St. Matthew Island, tends to exhaust these resourcescompletely. By the time individuals discover that remainingresources will not be adequate for the next generation, the nextgeneration has already been born. And in its struggle to survive,the last generation uses up every scrap, so that nothing remainsthat would sustain even a small population. But famine seldomacts alone. It is exacerbated by social strife, which interfereswith the production and delivery of food. And it weakens thenatural defenses by which organisms fight off disease.
Cellular Respiration Animation - Sumanas, Inc.
Photosynthesis converts these energy- depleted compounds (ADPand NADP+) back to the high energy forms (ATP and NADPH) and theenergy thus produced in this chemical form is utilized to drivethe chemical reactions necessary for synthesis of sugars andother carbon containing compounds (e.g., proteins, fats). Theproduction of high energy ATP and NADPH in plants occurs in whatis known as Light Phase Reactions (Z Scheme) (requiressunlight). The energy releasing reactions which converts themback to energy-depleted ADP and NADP is known as Dark PhaseReactions (Calvin Cycle) (does not require light) in whichthe synthesis of glucose and other carbohydrates occurs.
Garden - How To Information | eHow
Hydroponics is a method of growing plants without soil. Plants are simply placed in water with the necessary chemicals. As plants are deprived of support from the ground, they will fall down. To support the plants, an inert material like expanded clay pebbles is used in a pot in the tank (figure 5). Before inserting a plant in a hydroponic system, you must carefully remove all soil from the roots otherwise bacteria will putrefy them.
For many houseplants you can use tap water. Though, particularly for vegetables, it is advised to add appropriate nutrients. This cultivation method has the advantages of both requiring less frequent waterings and using very little water. With this system you can grow nearly any houseplant or vegetable. Hydroponics is useful also to show what nutrition plants need.
1 - Place some houseplants in hydroponics.
2 - Try hydroponics with vegetables and find the suitable nutrients.
Hydroponics in the Classroom
Growing plants without soil
To teach orphaned children how to grow their own food with hydroponics (gardening that uses very little water).
Organic Greenhouse Vegetable Production
Internet keywords: hydroponics classroom.
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