What are the light and dark reactions for photosynthesis?
The light reactions of photosynthesis involve light-driven electron and proton transfers, which occur in the thylakoid membrane, whereas the dark reactions involve the fixation of CO2 into carbohydrate, via the Calvin–Benson cycle, which occurs in the stroma (Figure 3).
Why are light and dark reactions called?
The most outdated name is dark reactions, because light is not directly required (Figure 1). Light reactions harness energy from the sun to produce chemical bonds, ATP, and NADPH. These energy-carrying molecules are made in the stroma where carbon fixation takes place.
What is meant by dark reactions?
: any of a series of chemical reactions in photosynthesis not requiring the presence of light and involving the reduction of carbon dioxide to form carbohydrate especially : calvin cycle.
What is the difference between light phase and dark phase?
Answer: Dark reaction takes place with the presence or absence of sunlight. Light reaction is considered as the light dependent reaction. Light reaction is also called as photo-chemical phase.
What is dark photosynthesis?
The dark stage of photosynthesis is an intricate process where NADPH and ATP are used to produce carbohydrate molecules (or sugars). Unlike the light phase, it can happen in light or darkness. This light phase is necessary for the following phase, the dark phase, which doesn’t necessarily need the presence of light.
What is light and dark phase?
Complete answer:
| Light reaction | Dark reaction |
|---|---|
| It takes place in the presence of light. | It takes place in the presence or absence of light. |
| It is also called a photochemical reaction or Hill reaction. | It is also called the biosynthetic phase or Blackman’s reaction or carbon dioxide fixation or the Calvin cycle. |
What is difference between light and dark reaction?
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 is light reaction Class 11?
“Light reaction is the process of photosynthesis that converts energy from the sun into chemical energy in the form of NADPH and ATP.”
What are the differences between light and dark reaction?
What is the relation between light and dark reaction?
Complete answer:
| Light reaction | Dark reaction |
|---|---|
| It involves the absorption of light energy and its conversion into chemical energy in the form of ATP and NADPH and hydrogen ions. | It utilizes ATP and NADPH 2 for the fixation of carbon dioxide to form carbohydrates, mainly glucose. |
What is light stage in photosynthesis?
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 is the meaning of light and darkness?
LIGHT AND DARKNESS are basic natural phenomena as well as symbolic or metaphorical meanings that are often equated with the pairs of Being and Non-Being, primordial chaos and world order.
When does the dark reaction occur at night?
No, the dark reaction does not occur at night. It occurs during the day, but the reaction does not use the light directly. Therefore, it is known as the dark reaction.
How is the light and the dark related?
Ultimately, “God divided the light from the darkness.” So initially, in this telling, darkness and light are connected—if not one—and later divided. Hesiod’s Theogony says that “First of all, the Void came into being” and “out of Void came Darkness and black Night, and out of Night came Light and Day.”
What are light and dark reactions in photosynthesis?
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. Dark reactions make use of these organic energy molecules (ATP and NADPH).