PLANT PHYSIOLOGY
PHOTOSYNTHESIS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Sunlight makes plants green and only green plants photosynthesize
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Light energy travels through the plant down to the roots and causes the water rise
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Sunlight is needed for the chemical reaction in photosynthesis to occur
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Light energy can be written as either a Reactant or a Product of photosynthesis
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Detailed explanation-1: -When written as a word equation the light energy appears above the arrow as it is required for photosynthesis but it is not actually a reactant. Here the monosaccharide glucose is shown as a product, although the actual processes in plants produce disaccarides.
Detailed explanation-2: -Sunlight is above the arrow in photosynthesis equation because it is not a reactant. Light energy is used to help the reactants to react! It is not “used up” in the chemical reaction of photosynthesis, it is energy needed for it to happen.
Detailed explanation-3: -Light is not a reactant in photosynthesis. The reactants are carbon dioxide and water. Light acts as an energy source to propagate the reaction by splitting the water molecule (photolysis) to provide the hydrogen ions (protons) and the electrons for the next phase.
Detailed explanation-4: -The Sun! The energy from light causes a chemical reaction that breaks down the molecules of carbon dioxide and water and reorganizes them to make the sugar (glucose) and oxygen gas. After the sugar is produced, it is then broken down by the mitochondria into energy that can be used for growth and repair.