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does anyone know D?

Lab 8 Spring 2020 The Light Reactions The light reactions begin with the photolysis of water. Photolysis refers to the process by which, in the Intact thylakoid membranes and light. water is split into oxygen protons and electrons. Therefore, was primary electron donor in photosynthesis. Conversion of water, a very stable molecule, to oxygen is er unfavorable and would not occur to any significant extent without input of light energy in photosystem e process by which, in the presence of s. Therefore, water is the olecule, to oxygen is energetically Check yourself! a. What does the word photolysis mean? Use your knowledge of root words to figure it out. • When oxygen from water is broken down into oxveen gas. Is it reduced or oxidized? Explain your answer. C. What does your What does your answer above reveal about chlorophylla? Hint: What is happening to chlorophylla at the same time that water is broken down into oxygen gas? V. What is the importance of this chemical reaction? Why would life on Earth cease if it could not occur? The electrons generated from the splitting of water are accepted by the chlorophyll of photosystem ll. Within the chlorophyll, the electrons become excited by light energy into a higher energy state. From this higher energy state, the electrons are passed from the chlorophyll of photosystem Il to the first member of a short electron transport chain. Once the electrons have traveled through the electron transport chain, they wind up being accepted by the chlorophyll of photosystem I. Check yourself! . Can you draw the flow of energy during photosynthesis? . Can you draw the flow of electrons? While electrons are passed from one member of the electron transport chain to another protons are pumped into the thylakoid lumen. This creates an electrochemical gradient that is then used to synthesize ATP from ADP and P in a manner superficially similar to that of cellular respiration. This ATP is then used in the light-independent reactions to synthesize carbohydrates. Check yourself! . How is this similar to cellular respiration? How is the different? At the end of this electron transport chain, the electrons are accepted by the chlorophyll of photosystem from here, they are again excited to a higher energy state by light. After passage through another smaller electron transport chain, the electrons are finally transferred to NADP and reduce it to NADPH. Thus, the products of the lieht reactions are a reduced electron carrier (NADPH) and ATP. The entirety of the light reactions can be disor using something called a "Z-scheme (Figure 2). The Z-scheme accurately depicts the flow of electrons starting with water and ending with NADPH. The Light-Independent Reactions The nnoducts of the licht reactions (NADPH and ATP) are used in the light-independent reactions to con diavide into carbohydrates. These reactions occur simultaneously with the light reactions in plant colls The Indenendent reactions take place in the stroma surrounding the thylakoid membranes. In brief NADU from the light independent reactions, H2O, and CO2 react for form glyceraldehyde-3-phosphate (G3P), which is

Answer 1

PHOTOLYSIS OF WATER IS AN IPMPORTANT PART OF LIGHT RECTION OF PHOTOSYNTHESIS .BECAUSE WE KNOW THAT ENERGY CURRENCY WHICH IS USED IN PLANTS ARE NADPH AND ATP ,THE HYDROGEN OF NADPH ARE GAINED THROUGH PHOTOLYSIS OF WATER.

THE PRODUCTS OF PHOTOLYSIS OF WATER ARE HYDROGEN IONS,ELECTRONS AND OXYGE ATOMS. THE OXYGEN ATOMS FORMS OXYGEN GAS ,LIFEON EARTH IS NOT POSSIBLE WITHOUT OXYGEN GAS