by Scarlett Pfeffer
Published 3 years ago
Updated 2 years ago
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 are light reactions?
The light reactions, also known as photolysis reactions, convert energy from the sun into chemical energy in the form of NADPH and ATP. These reactions must take place in the light and in chloroplasts of plants.
What is light reaction of photosynthesis class 10th?
The light reaction is the initial stage of photosynthesis which traps light energy to produce ATP and NADPH, whereas dark reaction is the second step of photosynthesis which utilizes the energy from ATP and NADPH to produce glucose.
What is light reaction Toppr?
(Image Source: actforlibraries.com) The light reaction of light dependent reaction occurs in the chloroplast of the mesophyll cells of the leaves. The chloroplasts are double-membraned cell organelles that are comprised of stacked disc-like structures known as thylakoids.
Where does light reaction of photosynthesis take place?
The chloroplastThe chloroplast is involved in both stages of photosynthesis. 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.
4 hours ago
For any plant performing photosynthesis, four factors influence this process. CO2, water, light, and chlorophyll are the raw materials for photosynthesis. But, in case of light dependent reaction or light reaction of photosynthesis, it is most influenced by presence or absence of light. The other three factors do not play a critical role in it.
24 hours ago
· Q.2. Why is the Calvin cycle called a dark reaction? Ans: Photosynthesis takes place in two stages – Light-dependent reaction stage and Light independent or dark reaction stage. The dark reaction stage is also known as the Calvin cycle. Light is not required in this stage of the photosynthesis process, hence the name dark reaction. Light is ...
10 hours ago
In photosynthesis, a light-dependent reaction uses light energy from the sun to split water which has been taken in by the organism.Water, when split, gives oxygen, hydrogen, and electrons.These electrons move through structures in chloroplasts and, by chemiosmosis, make ATP.. The hydrogen is converted to NADPH, which is then used in the light-independent …
27 hours ago
While there are many steps behind the process of photosynthesis, it can be broken down into two major stages: light-dependent reactions and light-independent reactions. The light-dependent reaction takes place within the thylakoid membrane and requires a steady stream of sunlight, hence the name light- dependent reaction.
8 hours ago
The dark reaction of photosynthesis refers to the phase that doesn’t need light energy or photons to complete the cycle and hence also called the light-independent photosynthetic phase. Dark reaction or Calvin cycle was first explained by a scientist named Melvin Calvin.It occurs at the site of the chloroplast within the fluid surrounding the thylakoid that refers to the stroma.
7 hours ago
· Photosynthesis is a light-driven oxidation-reduction reaction where the energy from the light is used to oxidize water, releasing oxygen gas and hydrogen ions, followed by the transfer of electrons to carbon dioxide, reducing it to organic molecules. Photosynthetic organisms are called autotrophs because they can synthesize chemical fuels such as glucose from …
23 hours ago
In photosynthesis, a light-independent reaction takes place in plant chloroplasts.In this process, sugars are made from carbon dioxide. The process, known as the Calvin cycle, uses products of the light-dependent reactions (ATP and NADPH) and various enzymes.Therefore, the light-independent reaction cannot happen without the light-dependent reaction.
3 hours ago
The basic reaction is: 6 C O 2 + 12 H 2 O + e --> 2 C 6 H 12 O 6 + 6 O 2. carbon dioxide + water + light energy --> glucose + oxygen. Oxygen molecules are colored to show their fate. Oxygen from CO 2 ends up in glucose. Oxygen from water becomes free O 2. Photosynthesis has two stages. Stage 1 requires light. Stage 2 can work in the light or in ...
31 hours ago
The Calvin cycle, light-independent reactions, bio synthetic phase, dark reactions, or photosynthetic carbon reduction (PCR) cycle of photosynthesis are the chemical reactions that convert carbon dioxide and hydrogen-carrier compounds into glucose.The Calvin cycle is present in all photosynthetic eukaryotes and also many photosynthetic bacteria.
