During the light-dependent stage (“light” reactions), chlorophyll absorbs light energy, which excites some electrons in the pigment molecules to higher energy levels; these leave the chlorophyll and pass along a series of molecules, generating formation of NADPH (an enzyme) and high-energy ATP molecules.
What happens in the light reactions of photosynthesis quizlet?
(In the light reactions, the energy of sunlight is used to oxidize water (the electron donor) to O2 and pass these electrons to NADP+, producing NADPH. Some light energy is used to convert ADP to ATP. The NADPH and ATP produced are subsequently used to power the sugar-producing Calvin cycle.)
What are the products of light reactions in photosynthesis?
During photosynthesis, light energy converts carbon dioxide and water (the reactants) into glucose and oxygen (the products).
What three reactions occur during the light reactions in photosynthesis quizlet?
- Absorption of light energy.
- Conversion of light energy into chemical energy.
- hStorage of chemical energy in the form of sugars.
Where does light reaction take place in photosynthesis quizlet?
The light-dependent reactions take place on the thylakoid membranes (the light is absorbed by the chlorophyll that is embedded in these membranes). The light-independent reactions (also called the Calvin Cycle or the dark reactions) take place in the stroma. The stroma is the fluid that fills the chloroplast.
How does light reaction occur?
The light reaction takes place in the thylakoid discs. There, water (H20) is oxidized, and oxygen (O2) is released. The electrons freed up from water are transfered to ATP and NADPH. The dark reaction occurs outside of the thylakoids.
Which of the following occurs during the light reactions?
The Light Reactions
ATP and NADPH are generated by two electron transport chains. During the light reactions, water is used and oxygen is produced. These reactions can only occur during daylight as the process needs sunlight to begin.
What are the steps involved in light reaction?
These reactions occur within specialised membrane discs within the chloroplast called thylakoids and involve three steps: Excitation of photosystems by light energy. Production of ATP via an electron transport chain. Reduction of NADP+ and the photolysis of water.
What happens during the light dependent and light-independent reactions of photosynthesis?
In the light-dependent reactions, energy from sunlight is absorbed by chlorophyll and that energy is converted into stored chemical energy. In the light-independent reactions, the chemical energy harvested during the light-dependent reactions drives the assembly of sugar molecules from carbon dioxide.
Why is photosynthesis a light-dependent reaction?
Explanation: Light reactions of photosynthesis are light dependent reactions. They are light dependent because for the process to start, a light ray should impinge on the chlorophyll and only then the reactions of photosynthesis begin.
Which process occurs during the light-dependent reaction of photosynthesis quizlet?
Which process occurs during the light-dependent reactions in photosynthesis? Water molecules are split. … ATP and NADPH are produced in the light-dependent reactions and used in the light-independent reactions.
Where does the light dependent reaction of photosynthesis take place?
Light-dependent reactions happen in the thylakoid membrane of the chloroplasts and occur in the presence of sunlight. The sunlight is converted to chemical energy during these reactions. The chlorophyll in the plants absorb sunlight and transfers to the photosystem which are responsible for photosynthesis.
Which of the following are generated by light reactions of photosynthesis quizlet?
The light reactions produce carbon dioxide, ATP, NADPH, all of which are used in the Calvin cycle. The light reactions produce ATP and NADPH, both of which are used in the Calvin cycle.
Which pigment is directly involved in the light reactions of photosynthesis?
Chlorophyll, the primary pigment used in photosynthesis, reflects green light and absorbs red and blue light most strongly. In plants, photosynthesis takes place in chloroplasts, which contain the chlorophyll.
What is light reaction and dark reaction in photosynthesis?
The main difference between light and dark reaction is that light reaction is the first stage of photosynthesis, which traps light energy in order to produce ATP and NADPH whereas dark reaction is the second stage of photosynthesis, which produces glucose by using the energy form ATP and NADPH produced from the light …
What happens in dark reaction of photosynthesis?
What is a dark reaction? In the dark reaction, plants use carbon dioxide with ATP and NADPH from the light reactions to produce glucose. It takes place in the stroma of the chloroplast.
Which of the following occurs in the dark reaction of photosynthesis?
Synthesis of PGA/PGAL.
Which of the following produced during the light phase of photosynthesis?
Photochemical phase, also called light of hill reaction occurs inside the thylakoids, espeically upon light. The function of this phase is to produce assimilatory power consisting of reduced coenzyme NADPH and energy ATP molecules.
In which part of chloroplast dark reaction occurs?
Dark reactions of photosynthesis are the chemical reactions that convert carbon dioxide and other compounds into glucose. These reactions occur in the stroma. Stroma is a fluid filled area of a chloroplast outside the thylakoid membrane.
Which of the following occurs during the light dependent reaction of a plant?
Which of the following occurs during the light-dependent reactions of plants? Light-driven electron transport in the chloroplast pumps H+ into the intermembrane space between the outer and inner membranes.
https://youtube.com/watch?v=KfvYQgT2M-k
Do light reactions depend on the Calvin cycle?
The Calvin cycle refers to the light-independent reactions in photosynthesis that take place in three key steps. Although the Calvin Cycle is not directly dependent on light, it is indirectly dependent on light since the necessary energy carriers ( ATP and NADPH) are products of light-dependent reactions.
What are the different stages of light-dependent reactions of photosynthesis?
Photosynthesis takes place in two sequential stages: The light-dependent reactions; The light-independent reactions, or Calvin Cycle.
What is produced by the light-dependent reactions of photosynthesis and used in the Calvin cycle quizlet?
What is the purpose of each phase? -The purpose of the light-dependent reactions is to use water and light to produce ATP and NADPH or energy that the cell can use. -The Calvin Cycle uses the energy produced in ATP and NADPH to produce glucose.
What does light-independent reaction produce?
Light-independent reaction is a series of biochemical reactions in photosynthesis not requiring light to proceed, and ultimately produce organic molecules from carbon dioxide. The energy released from ATP (produced during the light reactions) drives this metabolic pathway.
In what way are the light-dependent and light-independent reactions?
In the light-dependent reactions, energy from sunlight is absorbed by chlorophyll and that energy is converted into stored chemical energy. In the light-independent reactions, the chemical energy harvested during the light-dependent reactions drives the assembly of sugar molecules from carbon dioxide.
Where do the light dependent reaction and the Calvin cycle occurs in the chloroplast?
(i) The light dependent reaction refers to the light reaction of photosynthesis or Hill reaction and occurs in the grana of chloroplast. (ii) The Dark reaction (Calvin cycle) occurs in the stroma of chloroplast.
What does not occur in the light reactions of photosynthesis?
The conversion of sugar from atmospheric carbon does not occur in the light reactions, but occurs in the Calvin cycle of photosynthesis. Therefore, the correct answer is d. Carbon from the atmosphere is turned into sugar.
What do light reactions supply the Calvin cycle with?
The light reactions provide ATP and NADPH to the carbon fixation step of the Calvin cycle, and the cycle provides water and electrons to the light reactions.
Which Colour of light is responsible for greater rate of photosynthesis?
The rate of photosynthesis is affected by the color of light that is absorbed the best by the chlorophyll pigment. Chlorophyll absorbs blue and red light energies with the greatest efficiency. The color that has the highest influence on photosynthesis is the blue color. The red light is next best for photosynthesis.