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BIOLOGY
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What is photosynthesis?

All the answers above are A1. So instead, I'll give you the bigger picture. Photosynthesis means to "produce" (synthesis) from "light" (photo). This string of words is not very accurate at first. Let's put this into perspective: As humans, we respire - This means we react our food (glucose) with the oxygen we inhale. This reaction is exothermic; less energy is used in starting the reaction than is released into the environment. The energy released is transferred into heat to keep us warm, and to drive other energy intensive purposes (cell division, active transport in nerve cells etc.). Respiration: Chemical potential energy converted into other forms of energy (heat, kinetic etc.) Respiration takes place in the mitochondria (an organelle). Carbon dioxide and water are the chemical products of this reaction. Plants also respire for similar purposes - that is, to keep warm and carry out energy intensive reactions. However, unlike humans, plants do not physically eat foods containing carbohydrates and such. How do they then acquire a store of chemical potential energy to allow respiration? The answer is photosynthesis. In the chloroplast (another organelle specific to plants), energy from sunlight is used to drive the endothermic (more energy consumed than released) reaction whereby carbon from atmospheric carbon dioxide undergoes a reaction with water from the transpiration stream (water sucked up the roots, stems, into the leaf). This reaction produces glucose. Glucose is used as the chemical potential energy source for plant respiration. Photosynthesis: Infrared radiation / Light energy (photons) from the sun converted into chemical potential energy. ------------------------------------------------------------- Photosynthesis: 6H2O + 6CO2 -> 6O2 + C6H12O6 (Glucose [IR/SUNLIGHT -> CHEMICAL POTENTIAL] Respiration: 6O2 + 6C6H12O6 (Glucose) -> 6H2O + 6CO2 [CHEMICAL POTENTIAL -> OTHER FORMS]

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Ali Rajani
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The word photosynthesis comes from the Greek language: ‘photo’ means ‘light’ ‘synthesis’ means ‘putting together’ Simple definition: Using light energy to create food (glucose) for the plant. Side point: That's why plants need light to survive :) Light energy is absorbed by the chlorophyll from the Sun. Chlorophyll is the green pigment found in chloroplasts. these CHLOROPLASTS are found in the plant cells. Water is absorbed by the root hair cells by osmosis and oxygen is absorbed through tiny holes in the leaf called stomata by diffusion. Scientific explanation: Photosynthesis is a chemical reaction that takes place in the chloroplasts of green plant cells, where light energy is used to convert carbon dioxide (CO2) and water (H2O) into glucose (C6H12O6) and oxygen (O2). Word equation to represent this process: carbon dioxide + water —> glucose + oxygen The left hand side of the arrow are the reactants and the right hand side of the arrow are the products of photosynthesis.

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Heaja Sadiq
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Photosynthesis is chemical reaction that takes place in plants and certain bacteria which uses the energy from the light as a photon. Let's have a look in plants. Plants absorb water from the soil through the root and water will be photolysed into O2 and H+. The electron will be passed on from one tranport protein to another in the electron transport chain, which therefore, will be accepted by electron accceptor. The energy of transporting electron will be used to make ATP. ATP and electron carrier will be used to reduce the intermediate product of CO2 fixation, which has been taken from the air, to form precursor of glucose. Therefore here's the summary of the complete reaction of photosynthesis : CO2 + H2O -> C6H12O6 + O2

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Ali Muharom
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It is the process by which green plants and certain other organisms transform light energy into chemical energy where light energy  is captured and used to convert water, carbon dioxide and minerals into and energy-rich organic compounds.

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Usman Gul Mohammed
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Photosynthesis is a chemical reaction that takes place inside a plant, producing food for the plant to survive. Carbon dioxide, water and light are all needed for photosynthesis to take place. Photosynthesis happens in the leaves of a plant. Plants need food to respire, grow and reproduce. Unlike animals, plants are able to make their own food by the process of photosynthesis. Photosynthesis takes place in the part of the plant cell containing chloroplasts, these are small structures that contain chlorophyll. For photosynthesis to take place, plants need to take in carbon dioxide (from the air), water (from the ground) and light (usually from the sun).

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Ryan Lai
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Photosynthesis is a reaction between water, carbon dioxide, and sunlight that produce Oxygen, sugar(glucose) and energy in the form of adenosine triphosphate (ATP) 6CO2 + 6H2O + sun light ----> C6H12O6 + 6O2 + 6H2O

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Farhan Harsya
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48 students helped

Photosynthesis is a chemical reaction that happens in the leaves of a plant to food for it to survive. Photosynthesis takes place in the part of the plant cell containing chloroplasts, which are small structures containing chlorophyll. For photosynthesis to take place, plants need to take in carbon dioxide (from the air), water(from the ground) and light (usually from the sun).

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Wahida Ahmed
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