Light reaction of photosynthesis

Answer 1

Answer

Light Reaction in photosynthesis occurs in the thylakoids found in chloroplasts. here are summarized process:

1. light energy strikes chlorophyll bodies and electrons get excited.

2. electrons NADP+ and H+ join together to form NADPH in the elctron transport chain.

3. light hits a second chlorophyll molecule and splits the water molecule into hydrogen and oxygen. OXygen is released into the atmosphere and hydrogen ions are added.

4. more H+ is carried by the electron transport chain.
5. Energy is generated for the formation of ATP. to summarize, the light reaction results in the A. production of ATP, a high energy molecule, and NADPH for use in the dark reaction phase; and B. production of oxygen which is released into the atmosphere.

Answer 2

See also: Light-independent reactions

The light-dependent reactions, or photosynthesis, is the first stage of photosynthesis, the process by whichplants capture and store energy from sunlight. In this process, light energy is converted into chemical energy, in the form of the energy-carrying molecules ATP and NADPH. In the light-independent reactions, the formed NADPH andATP drive the reduction of CO2 to more useful organic compounds, such as glucose. However, although light-independent reactions are, by convention, also called dark reactions, they are not independent of the need of light, for they are driven by ATP and NADPH, products of light. They are often called the Calvin Cycle or C3 Cycle.

The light-dependent reactions take place on the thylakoid membrane inside a chloroplast. The inside of the thylakoid membrane is called the lumen, and outside the thylakoid membrane is the stroma, where the light-independent reactions take place. The thylakoid membrane contains some integral membrane protein complexes that catalyze the light reactions. There are four major protein complexes in the thylakoid membrane: Photosystem I (PSI),Photosystem II (PSII), Cytochrome b6f complex, and ATP synthase. These four complexes work together to ultimately create the products ATP and NADPH.

The two photosystems absorb light energy through pigments - primarily the chlorophylls, which are responsible for the green color of leaves. The light-dependent reactions begin in photosystem II. When a chlorophyll a molecule within the reaction center of PSII absorbs a photon, an electron in this molecule attains a higher energy level. Because this state of an electron is very unstable, the electron is transferred from one to another molecule creating a chain of redox reactions, called an electron transport chain (ETC). The electron flow goes from PSII to cytochrome b6f to PSI. In PSI, the electron gets the energy from another photon. The final electron acceptor is NADP. In oxygenic photosynthesis, the first electron donor is water, creating oxygen as a waste product. In anoxygenic photosynthesis various electron donors are used.

Answer 3

Which of the following is part of the light reaction?

A) carbon fixation

B) reduction of carbon

C) addition of electrons and protons to carbon

D) regeneration of NADP+

E) formation of waste products in the form of O2

ANSWER: E if u are asked to select one

Answer 4

the diagram of light reactions in photosynthesis?

Answer 5

Light reaction in photosynthesis require light in order to produce organic energy molecules. They are initiated by colored pigments, such as chlorophyll.

Answer 6

The first stage of photosynthesis, occurring only in the presence of light, during which energy captured from light drives the production of ATP.

Answer 7

the process of light reaction is occurs during the process of photosynthesis

Answer 8

photon reaction is the light reaction in photosynthesis..!!

Answer 9

ATP and NADPH.

Answer 10

because of the gravity of the earth