During photochemical phase of photosynthesis what happens

Answer Photosynthesis occurs in two stages- light reaction and dark reaction. During the light reaction water is split using energy from light and NADPH2 and ATP are synthesized The chemical reaction of photosynthesis (as I hinted at in Detail #1) occur in two phases. Phase #1 is called photolysis or the photochemical reactions or ( if you don't like those two names ) the light reactions Photosynthesis is a process by which phototrophs convert light energy into chemical energy, which is later used to fuel cellular activities. The chemical energy is stored in the form of sugars, which are created from water and carbon dioxide. 3,12,34

During photochemical reaction of photosynthesi

The electron transport chain is a series of molecules that accept or donate electrons easily. By moving step-by-step through these, electrons are moved in a specific direction across a membrane. The movement of hydrogen ions are coupled with this. This means that when electrons are moved, hydrogen ions move too The accumulation -in the atmosphere- of oxygen (O2) produced during the photochemical stages of photosynthesis (see Shedding light on Photosynthesis) was one of these major events

During the reaction of photosynthesis water gets converted into glucose and oxygen.The reaction requires light energy, which is absorbed by green substance called chlorophyll. Photosynthesis takes place in leaf cells. These contains chloroplast, which are tiny objects containing chlorophyll The first phase is the photochemical phase or light-dependent process. This phase is commonly known as the light reaction. The second phase is the biosynthetic phase of the dark reaction of photosynthesis. This phase is the light-independent process Through photosynthesis, plants convert the energy of sunlight into stored chemical energy by forming carbohydrates from atmospheric carbon dioxide and water and releasing molecular oxygen as a byproduct. Both carbohydrates and oxygen are needed to sustain animal life. Many other processes in nature are photochemical

the gas phase on G. emersonii and on the dynamic of photochemical steps involved in the E P model and to asses the optimal values of light intensity Iopt maximizing the photosynthesis rate. A second purpose of this paper is to evaluate the efficiency of the photochemical process by usin Photosynthesis process used by plants to convert light energy from sunlight into sugar plant energy. The two phases of photosynthesis are: 1) Light reactions also called as photochemical reactions is the first stage of photosynthesis that converts the light energy into sugar. 2) Calvin Cycle or light-independent reaction or dark reactions or carbon fixation reactions [ A phase of photosynthesis during which light absorption and transformation of solar energy into the chemical energy of ATP and NADPH+H+ happens. This process occurs in the active photochemical membranes of the chloroplast and represents a system of photophysicalphoto-chemical and chemical reactions Chlorophyll absorbs the red and blue segment of the white light and photosynthesis occurs most efficiently at these wavelengths. When the light falls on the plant, the chlorophyll pigment absorbs this light and electrons in it gets excited. This process occurs in a complex protein system which is collectively called as a photosystem

The processes occurring during the light phase of photosynthesis can be related to: (1) Absorption of carbon dioxide; (2) Absorption of solar energy and its transformation into chemical energy. (1) Absorption of carbon dioxide from the external environment happens through the open osteole (photoactive physiological reaction) Blackmann (1905) pointed out that the process of photosynthesis consists of two phases: (1) Light reaction or Light phase or Light-dependent phase or Photochemical phase (2) Dark reaction or Dark phase or Light independent phase or Biochemical phase. During light reaction, oxygen is evolved and assimilatory power (ATP and NADPH 2) are formed. Photolysis during photosynthesis occurs in a series of light-driven oxidation events. The energized electron (exciton) of P680 is captured by a primary electron acceptor of the photosynthetic electron transfer chain and thus exits photosystem II. In order to repeat the reaction, the electron in the reaction center needs to be replenished

NADP or Nicotinamide adenine dinucleotide phosphate (NADP+) is produced together with ATP throughout the light or photochemical reactions taking place during the process of photosynthesis. These are all the essential components involved in the process of photosynthesis Photosynthesis is the process by which green plants and certain microorganisms use the energy from the sun to produce sugar. Water and Carbon dioxide are the primary raw materials of the process. Oxygen is normally released as a by-product during the photosynthetic process The end result of the photochemical part of photosynthesis is the formation of \(\ce{O_2}\), \(\ce{NADPH}\), and ATP. Much of the oxygen is released to the atmosphere, but the \(\ce{NADPH}\) and ATP are utilized in a series of dark reactions that achieve the reduction of carbon dioxide to the level of a a carbohydrate (fructose) The overall function of light-dependent reactions, the first stage of photosynthesis, is to convert solar energy into chemical energy in the form of NADPH and ATP, which are used in light-independent reactions and fuel the assembly of sugar molecules. Protein complexes and pigment molecules work together to produce NADPH and ATP

during the light-independent phase of photosynthesis, the plant secretes or wastes some energy by putting it into effect. this is done through the Calvin cycle and glycolysis. the light. Ribulose phosphate is being synthesized in the chloroplasts. RuBP is formed by taking a phosphate, coming from the splitting of ATP, and joining it with RuP, changing RuP (ribulose phosphate) into RuBP. RuBP is then able to join with CO2 and form an unstable 6C molecule which is the basis for the dark reaction. (1 vote In photosynthesis, the light reactions occur first, in which light energy is used to produce energy and electrons (in the form of ATP and NADPH) that powers the dark reactions, which takes the energy and electrons to convert CO2 and other compounds into glucose. 699 view Photosynthesis is a photo-chemical reaction involving 2 main steps, i.e. Light reaction or Hill's reaction and Dark reaction or Blackmann's reaction. Light reaction occurs in presence of light. Dark reaction can occur in absence of light but is dependent upon the end product of light reaction. Thus light reaction must precede dark reaction In photosynthesis, ATP is synthesized from the thylakoid membrane (sites of the photochemical reactions of photosynthesis) of chloroplast cells of plants. The photon particles from the sunlight..

photosynthesis (chemistry

Photosynthesis ☀️ (Definition, Process, Stages & Significance

  1. A. NUTSHELL -- in photosynthesis, absorbed light energy is used during photochemical reactions to form ATP and NADPH which, in turn, are used in biochemical reactions that convert CO 2 to 3-PGA, the building block for all other plant organic matter. B. Relationship between photochemical and biochemical reactions -- Study Figure 10.5: 1
  2. Chloroplasts perform photosynthesis during the daylight hours. The immediate products of photosynthesis, NADPH and ATP, are used by the photosynthetic cells to produce many organic molecules. In plants, the products include a low-molecular-weight sugar (usually sucrose ) that is exported to meet the metabolic needs of the many nonphotosynthetic.
  3. Results reveal that, even if the photosynthesis rate measurements of the considered mutants are higher than the measurements of the wild type even at high light intensities, when a culture is exposed to intense light for a prolonged amount of time (as it happens during the summer season), the photoinhibition leads to a dramatic reduction of the.
  4. Thangaraj Kumaravel/CC-BY 2.0. Photosynthesis takes place in the cell's chloroplast in two stages: the light stage and the dark stage. Each stage occurs in a different part of the chloroplast. In the light stage of photosynthesis, the chloroplast absorbs the light of the sun. This sets off a series of chemical reactions, beginning by converting.

formula for photochemical reactions. Light+NADP++H₂0+ADP+Pi--->O₂+ATP+NADPH. formula for biochemical reactions. ATP+NADPH+CO₂--->G3P+H₂O. oxidized molecule. when a molecule loses an electron and it's charge becomes more positive. reduced molecule. when a molecule gains an electron and it's charge becomes more negative gradman555p98x9p. The right answer is A (which represents this picture). The first phase of photosynthesis, called the light phase, requires the illumination of the sheet. This photochemical phase corresponds to the capture of light energy by light-absorbing pigments and its conversion into chemical energy in the form Definition of Light Reaction. It is the first phase of photosynthesis, where a plant derives cellular energy, i.e. ATP and NADPH, from the light energy, i.e. sunlight. The photochemical phase or light reaction is a stage that involves the oxidation of a single water molecule into half oxygen molecule.. Therefore, the splitting of two water molecules will result in releasing one oxygen molecule The light-dependent reactions use light energy to make two molecules needed for the next stage of photosynthesis: the energy storage molecule ATP and the reduced electron carrier NADPH. In plants, the light reactions take place in the thylakoid membranes of organelles called chloroplasts Photosynthesis consists of two types of reactions: a light dependent one and a light-indepen­dent one. The light-dependent reaction is a photochemical reaction or light reaction as it came to be called, culminating in the generation of NADPH 2, ATP and evolution of molecular oxygen.. The NADPH 2 and ATP are energy-rich, having caught the electrons that became available when light impinged.

We propose that the PGR5-dependent CEF-PSI functions mainly to start photosynthesis during the high-light phase under fluctuating light via the rapid build-up of ΔpH across the thylakoid. Photosynthesis is not a single chemical reaction, but rather a set of chemical reactions. The overall reaction is: 6CO 2 + 6H 2 O + light → C 6 H 12 O 6 + 6O 2; The reactions of photosynthesis can be categorized as light-dependent reactions and dark reactions. Chlorophyll is a key molecule for photosynthesis, though other cartenoid pigments. Photosynthesis takes place in the chloroplast and has two phases: a light reaction and a light-independent reaction (LIR). During the light reaction, water is used in conjunction with a very.

(PDF) Photochemical Phase Transitions Enable Coharvesting

of plant under other colors (blue, violet, red). (This idea makes a nifty science project.) Detail #3 The chemical reaction of photosynthesis (as I hinted at in Detail #1) occur in two phases. Phase #1 is called photolysis or the photochemical reactions or (if you don't like those two names) the light reactions CHAPTER 13 PHOTOSYNTHESIS IN HIGHER PLANTS Green plants carry out 'photosynthesis', a physico-chemical process by which they use light energy to drive the synthesis of organic compounds. Ultimately, all living forms on earth depend on sunlight for energy. The use of energy from sunlight by plants doing photosynthesis is the basis of life on earth

Photosynthesis initiates most of the food chains on Earth. Photochemical stage, light phase or light phase (phase - dependent light solar) is the first phase of the photosynthetic process. It happens right after the clear phase in a chain reaction until the substrate is depleted What happens during the dark phase of photosynthesis? In the dark phase (which takes place in the stroma), the ribulose bisphosphate added to the carbon dioxide gas (CO 2) in the air results in the production of organic compounds, principally carbohydrates or sugars, whose molecules contain carbon, hydrogen, and oxygen.This cycle of. Laura - We need vitamin D to maintain our bones and to make sure we absorb enough calcium from our diet. One of the main sources to humans, radiation from the sun can penetrate the layers of the skin called the epidermis, while there's a chemical called 7-hydrocholesterol and this is observed through UV light and then will produce the pre-vitamin D molecule Within the photosynthesis process there are two distinctly separate stages, a photochemical stage followed by a biochemical stage. Photosynthesis. Photosynthesis - process by which plants use radiant energy (light) to convert Carbon Dioxide and Water into chemical energy (Glucose, C 6 H 12 O 6) 6CO 2 + 6H 2 O + light à C 6 H 12 O 6 + 6O

Herein, what happens to water during photosynthesis? During the process of photosynthesis, six molecules of carbon dioxide and six molecules of water react in the presence of sunlight to form one glucose molecule and six molecules of oxygen. The role of water is to release oxygen (O) from the water molecule into the atmosphere in the form of oxygen gas (O2) PHOTOSYNTHESIS Photosynthesis as it operates in the chloroplast has two phases, the light reac­ tions, which are directly dependent on light energy, and the dark reactions, which can occur without the direct influence of light. Research over the last 30 years has heavily concentrated on the light reactions of photosynthesis. They are primaril During the day, provided the rate of photosynthesis is sufficiently high, plant leaves, and water plants, give out oxygen. Biosynthesis Some of the glucose produced by photosynthesis is used for.

Direct photolysis involves water-oxidation and a light-dependent transfer of electrons to the [Fe]-hydrogenase, leading to photosynthetic hydrogen production. Electrons are derived from water upon the photochemical oxidation by photosystem II (PSII or water-plastoquinone oxidoreductase), which is an enzyme located in the thylakoid membrane of algae and cyanobacteria The two stages of photosynthesis: Light reactions - use sunlight to initiate electron transfer, thereby reducing NADP+ to NADPH and splitting water to give off oxygen as a by-product. form ATP through phosphorylation take place in the thylakoids of the chloroplast Calvin Cycle —sometimes referred to as ‗dark reactions' because it does not require light energy for its processes to take. of photosynthesis (Govindjee, 2004). 1.2. Non-photochemical quenching NPQ is classified into three types according to their relaxation times and mechanisms (Muller¨ et al., 2001): (a) Energy-dependent quenching (qE) takes place through charge separation at the reaction centre; qE happens in seconds to minutes and requires the build-up of a. 2. Calvin, Benson and others found that during photosynthesis, the first stable product in sugar formation is 3-phosphoglyceric acid, while Hatch and Slack showed that it is oxaloacetic acid. Comment on these contradicting observations. (2) 3. Given below are the scientific terms related to photosynthesis

Photosynthesis and the Electron Transport Chain Ask A

The path of carbon in photosynthesis - Encyclopedia of the

(a) The photochemical phase is Hill reaction. It occurs in presence of light. It includes excitation of chlorophyll, photolysis of water molecule, photophosphorylation and reduction of NADP to 15 NADPH2. (b) The excited chlorophyll transfers an electron from chlorophyll in many steps As a consequence an electron of chlorophyll is transferred to a higher energy level. This energy-rich electron is then transferred to a neighbouring electron acceptor with a strong electronegative redox potential. The transfer of the electron from the activated chlorophyll to the (first) acceptor is the first photochemical phase of photosynthesis Information. CHAPTER WISE Test Series from Wise got. Bioenergetic Chapter Test BIOLOGY TEST 4 iS UPLOADED YOU CAN easily attempt this test. bioenergetic is one of the most important chapters for MDCAT preparation. Click on the Start Quiz button to star. You have already completed the quiz before

The light phase of photosynthesis is called . A) Hill reaction done clear. B) During photochemical reactions of photosynthesis [CPMT 1986] A) The separation of water into hydrogen and oxygen during photosynthesis is aided by . A Overview of Photosynthesis. Photosynthesis is a multi-step process that requires sunlight, carbon dioxide, and water as substrates. It produces oxygen and glyceraldehyde-3-phosphate (G3P or GA3P), simple carbohydrate molecules that are high in energy and can subsequently be converted into glucose, sucrose, or other sugar molecules. These sugar. (f) Briefly explain the term 'Destarched to plant'. (g) Give a balance chemical equation to represent the process of photosynthesis. (h) Mention two ways in which photosynthesis differs from respiration in plants. (i) List the events taking place in the photochemical phase of photosynthesis

Photolysis in Photosynthesis. Photolysis is defined as either a part of the light-dependent reaction or photochemical phase or light phase or Hill reaction of photosynthesis. Photosynthetic photolysis general reaction can be given as follows: H2A + 2 Photons (Light) → 2e- + 2H+ + A. The chemical nature of A is based on the organism type Photosynthesis 1 Demographics 2 Objectives 3 Protocol 4 Summary 5 Executive Summary 6 Curriculum Overview 7 The Backbone 8 Standards 9 Assessment Plan 10 Lesson 1.1&1.2 11 Lesson 2.1 12 Lesson 2.2 13 Lesson 3.1 14 Lesson 4.1 15 Lesson 4.2 16 Lesson 4.3 17 Lesson 5.1 18 Lesson 5.2 19 Final Test SWBAT identify and describe different types of energy and understand conversion of solar energy to. Photosynthesis. Why is oxygen released during light phase? Wiki User. ∙ 2016-02-28 03:15:06. Best Answer. Copy. Light phase need electrons. These are supplied photolysis of water. This generates AT

What are the phases of photosynthesis? - Quor

Since then CO 2 assimilation during photosynthesis was said to be of two main types: those plants in which the first product of CO 2 fixation is a C 3 acid (PGA), i.e., the C 3 pathway, and those in which the first product was a C 4 acid (OAA), i.e., the C 4 pathway. These two groups of plants showed other associated characteristics that we. Answers: 1 on a question: Review the pcr (calvin-benson-basham) cycle and the photochemical (light) reactions. if photosynthesizing green algae are provided with co2 synthesized with heavy oxygen (18o), later analysis will show that all but one of the following compounds produced by the algae contain the 18o label. that one i The general equation for photosynthesis is: 6 CO₂ + 6 H₂O + light --> C₆H₁₂O₆ + 6 O₂. Water molecules are also produced during the chemical stage of photosynthesis as the following complete equation reveals: 6 CO₂ + 12 H₂O + light --> C₆H₁₂O₆ + 6 H₂O + 6 O₂ The light reaction of photosynthesis in green plants is shown below. In this process, in a scheme that is reminiscent of electron transport in mitochondria, water is oxidized by photosystem II. Electrons from water are moved through PSII to a mobile, hydrophobic molecule, plastaquinone (PQ) to form its reduced form, PQH 2. PSII is a complicated. The light phase happens in the chloroplasts, which are the structures that contain chlorophyll. Up Next. Photosynthesis review. 1) Light reaction ( light dependent reaction) 2) Dark reaction (light independent reaction) Light reaction takes place in the the thylakoids in the presence of light to make ATP and NADPH. Breaking down photosynthesis stages . Rubisco catalyzes the bonding of CO 2 to.

NCERT Class XI Biology: Chapter 13 - Photosynthesis In

Difference Between Light Reaction And Dark Reactio

  1. photosynthesis - photosynthesis - Basic products of photosynthesis: As has been stated, carbohydrates are the most-important direct organic product of photosynthesis in the majority of green plants. The formation of a simple carbohydrate, glucose, is indicated by a chemical equation, Little free glucose is produced in plants; instead, glucose units are linked to form starch or are joined with.
  2. The maximum photochemical efficiency of PSII (Fv/Fm) decreased approximately 32% during the initial period of the nitrogen deficiency and was stable after 10 days, which indicated that the light.
  3. Photosynthesis occurs in two main phases: The light-dependent phase (Photochemical phase or Light reaction). The light-independent phase (Biosynthetic phase or Dark reactions)
  4. This happens because the stromal lamellae does not possess enzyme NADP reductase the ATP and NADPH (formed during the photochemical reaction) are utilised. 3.Explain the process of bio-synthetic phase of photosynthesis occurring in chloroplast. Ans. Biosynthetic phase (Dark Reaction) : The process by which carbon - dioxide is reduced.
  5. Quantum mechanics explains efficiency of photosynthesis. by University College London. Plant cells with visible chloroplasts (from a moss, Plagiomnium affine) Credit: Wikipedia. Light-gathering.
  6. al side of the membrane

Photochemical reaction chemical reaction Britannic

The phase of light-dependent photosynthesis begins with the arrival of photons (units of light energy ) to photosystem II or PSII. (b) What makes HeLa cells different from any other cell types? In this phase light energy is converted into chemical energy. This stage doesnt need light to occur, and can happen anytime Photosynthesis is divided in two parts: 1. Light-dependent reactions (light reactions) 2. Light-independent reactions (dark reactions). Light reactions need light to produce organic energy molecules (ATP and NADPH).They are initiated by colored pigments, mainly green colored chlorophylls Photosynthesis is the process in which light energy is absorbed and converted to chemical energy. This chemical energy is eventually used in the conversion of carbon dioxide to sugar in plants. Natural electron acceptor. During photosynthesis, natural electron acceptor NADP is reduced to NADPH in chloroplasts. The following equilibrium reaction takes place LIGHT REACTION. The light reaction is also called the Photochemical phase. It includes light absorption, water splitting, oxygen release and the formation of high-energy chemical intermediates (ATP and NADPH). In PS II the absorption maxima is at 680 nm and hence it is called PS680

Two Phases Of Photosynthesis - Questions Hous

Photosynthesis Definition. Photosynthesis is defined as the process, utilized by green plants and photosynthetic bacteria, where electromagnetic radiation is converted into chemical energy and uses light energy to convert carbon dioxide and water into carbohydrates and oxygen. Image created using biorender.com It was observed that the rate of photosynthesis is directly proportional to the intensity of light, i.e., rate increases with the increase in intensity of light till the plant achieved the saturation point. The process ofphotosynthesis takes place in following two steps (i) Light reaction or the photochemical phase

Photosynthesis - Mechanism,History,Importance - Biologyteac

Photosynthesis definition, the complex process by which carbon dioxide, water, and certain inorganic salts are converted into carbohydrates by green plants, algae, and certain bacteria, using energy from the sun and chlorophyll. See more The second phase is observed at higher C i values and corresponds to a limitation of photosynthesis by regeneration of ribulose 1, 5-bisphosphate (RuBP), which is believed to be substantially due to a limitation of electron transport capacity. Under these conditions, down-regulation of electron transport would be minimal During photosynthesis, plants incorporate atmospheric CO 2 into carbohydrates using the energy of sunlight. CO 2 enters the leaf through pore-like openings located predominately in the lower epidermis of the leaf called stomata. The sizes of the stomata are directly controlled through regulating the turgor pressure of the surrounding cells, known as guard cells Light dependent reaction - In This phase many chemical reactions occurs in very quick succession initiated by light, all reaction takes place in the presence of light hence this phase is technically called as photochemical phase or light dependent reaction , this light reaction takes place in Thylakoids that contain chlorophyll called as.

Video: Light Reaction: Reaction Steps, Photosynthesis with

Photosynthesis Mechanism - Biologyteac

Measurement of steady-state Chl fluorescence during photosynthesis and during a saturating flash provides a nonintrusive optical method for estimating photochemical efficiency of PSII, <f>PSII, i.e. the probability that an ab-sorbed quantum is used in photosynthetic electron trans-por t (Genty e al. , 1989). Th e rat of electron transport / A detailed understanding of the fine control of the photodynamics by external influences on the light-harvesting complex, such as which occur during non-photochemical quenching, an important regulatory mechanism to dissipate excess energy in photosynthesis, is still missing

The Process of Photosynthesis in Plants (With Diagram

  1. Photosynthesis. Photosynthesis is a process in which the plants use light energy to make carbohydrate from carbon dioxide and water. The overall reaction of photosynthesis can be given in a simple form as follows: 6CO2 + 6H2 + Light Energy → C6H12O6 + 6O2. In green plants, water is the hydrogen donor and it undergoes oxidation to produce oxygen
  2. Photosynthesis occurs in two stages. In the first stage, light-dependent reactions or light reactions capture the energy of light and use it to make the energy-storage molecules ATP and NADPH. During the second stage, the light-independent reactions use these products to capture and reduce carbon dioxide
  3. In photosynthesis, energy from light is used to convert carbon dioxide and water into glucose and oxygen. For 6 carbon dioxide and 6 water molecules, 1 glucose molecule and 6 oxygen molecules are produced. Actually, plants reserve very little of the glucose for immediate use. Glucose molecules are combined by dehydration synthesis to form.
  4. photosynthesis (fō'tōsĭn`thəsĭs), process in which green plants, algae, and cyanobacteria utilize the energy of sunlight to manufacture carbohydrates from carbon dioxide and water in the presence of chlorophyll.Some of the plants that lack chlorophyll, e.g., the Indian pipe Indian pipe, common name for the genus Monotropa and for the family Monotropaceae, low flowering plants of north.
  5. Photosynthesis. Photosynthesis is an energy capture process found in plants and other organisms to harvest light energy and convert it into chemical energy. This photochemical energy is stored ultimately in carbohydrates which are made using ATP (from the energy harvesting), carbon dioxide and water
  6. It is adapted to absorb a lot of light. It has lots of chloroplasts. Sunlight is needed for photosynthesis. In light-dependent reactions (as explained in light and dark reactions), photosynthesis increases with more light. More chlorophyll molecules are ionized and more ATP and NADPH are generated as more light photons are focused on a green leaf
  7. In photochemical reaction absorption of radiation takes place. Photochemistry Starts from the Absorption of Solar Radiation Photochemical reactions of organic matter can take place in surface waters and any irradiated surfaces of organic or inorganic substrata. The prerequisite for photochemical reactions is the absorption of radiation Photochemical reaction, a chemical reaction initiated by.

The dark or light-independent reactions are the synthesis part of photosynthesis that just need the products of the light reactions. These reactions occur in the stroma of chloroplasts. High-energy molecules (ATP, NADPH) created earlier, 'power' this phase of photosynthesis. The hydrogen ions and chemical energy that were. The results of long-term studies of photorespiration are summarized and the unsuccessful attempts to increase productivity by suppressing this process are shown. It has been shown that photorespiration and glycolate metabolism are involved in the regulation of the relationship between light processes in chloroplasts and the dark reactions of carbon dioxide assimilation (In photosynthesis, plants absorb CO 2 and release O 2. The normal rate of photosynthesis is many times the rate of respiration. As a result, CO 2 produced during respiration is consumed and a lot of more is absorbed from outside. Oxygen produced during photosynthesis is much more than required for respiration. Therefore, oxygen passes out. Photochemical reaction Start when the pigments (in photosystem) absorbs a photon of light. involves the light reaction; that happens in the thylakoid of the chloroplast Can be divided to 3 component processes: 1) excitation of electron 2) electron transport chain 3) ATP synthesi Question 28: List the events taking place in the photo-chemical phase of Photosynthesis. Answer: Photochemical phase of photosynthesis is light dependent. A series of chemical reactions occur in quick succession initiated by light, therefore the phase is called photochemical phase. It takes place in chlorophyll containing thylakoids of chloroplast