The dark reaction occurs both in the presence and absence of sunlight. This reaction occurs in the stroma of the chloroplasts which are cell organelles known as the kitchen of the cells.
- 1 Do light and dark reactions occur at the same time?
- 2 Can light-independent reactions occur in the light and dark?
- 3 Is it true that light reaction occurs during the day time and dark reaction at night explain?
- 4 Is it possible for the reaction of dark phase to occur without light?
- 5 Where does light reaction and dark reaction occur?
- 6 Do dark reactions occur only in the dark?
- 7 How are the light and dark reaction connected?
- 8 Can the Calvin cycle occur during the day and night?
- 9 At what time of the day can dark reaction occur?
- 10 What is the difference between light and dark reaction?
- 11 When can light reactions occur?
- 12 Is dark reaction and Calvin cycle the same thing?
- 13 Can the Calvin cycle occur in the dark?
- 14 Does the Calvin cycle require light?
- 15 What are the reactants and products for both light and dark reactions?
- 16 Why do dark reactions depend on light reactions?
- 17 What is the similarities of light reaction and dark reaction?
- 18 Why photosynthesis does not occur in the dark?
- 19 Where does light reaction occur?
- 20 Why photosynthesis is called dark reaction?
- 21 Why doesn’t the Calvin cycle occur at night?
- 22 Why Calvin cycle is called dark reaction?
- 23 Does carbon fixation occur in the dark?
- 24 Do dark or light-independent reactions occur in plants only during the daytime?
- 25 Does photosynthesis occur at night?
- 26 Do not need light energy to power their reactions and can occur day or night?
- 27 Why is the dark stage called the dark stage?
- 28 What is the difference between light phase and dark phase in photosynthesis?
- 29 Does light-dependent reactions require sunlight?
- 30 Where do Calvin cycle reactions occur?
- 31 What happens dark reaction?
- 32 Which process is most directly driven by light energy?
- 33 What is the correct order for the reactions of the Calvin cycle?
- 34 What is ADP and NADP?
- 35 What is the difference between ps1 and ps2?
- 36 Is oxygen used in dark reactions?
- 37 Is the dark stage anabolic or catabolic?
- 38 What is the site of dark reaction in photosynthesis?
- 39 Which reaction is also called dark reaction?
- 40 Does photosystem 1 occur before photosystem 2?
- 41 What is light reaction also called?
- 42 Can photosynthesis take place without sunlight?
- 43 Will plants grow in the dark?
- 44 Why can photosynthesis only occur in the light?
Do light and dark reactions occur at the same time?
Light reaction is a light dependent reaction that occurs before the dark reaction. The dark reaction, on the other hand, depends upon the products of the light reaction. Thus, it could be said that the light reaction and dark reaction do not occur at the same time.
Can light-independent reactions occur in the light and dark?
The reactions that make up the process of photosynthesis can be divided into light-dependent reactions, which take place in the thylakoids, and light-independent reactions (also known as dark reactions or the Calvin cycle), which take place in the stroma.
Is it true that light reaction occurs during the day time and dark reaction at night explain?
Both the light and dark reactions occur in the day. As dark reaction does not require light it doesn’t meant it occurs at night it only requires products of light reaction like ATP and NADPH.
Is it possible for the reaction of dark phase to occur without light?
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.
Where does light reaction and dark 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.
Do dark reactions occur only in the dark?
The term dark reactions does not mean the reactions happen at night or that they require darkness. It means that the reactions can proceed regardless of the amount of light available. The term is only used to identify the dark reactions with the light reactions, which obviously require light.
How are the light and dark reaction connected?
Both light reaction and dark reaction occurs in a plant. Light reaction is commonly known as photosynthesis in which they prepare food by the help of sunlight and produce ATP which is a form of energy. In dark reaction glucose is produced by the help of ATP which was produced in light reaction.
Can the Calvin cycle occur during the day and night?
It can occur day and night. the light reaction produces ATP &NADPH for the Calvin cycle to occur. NADPH is a short-lived process and is a light-dependent reaction.
At what time of the day can dark reaction occur?
Dark reaction occurs only at night in the stroma of chloroplast.
What is the 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 …
When can light reactions occur?
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.
Is dark reaction and Calvin cycle the same thing?
When the reaction of photosynthesis does not require light energy is called as a light-independent or dark reaction. It is also called as a biosynthetic phase or Calvin cycle. It occurs in the stroma of the chloroplast.
Can the Calvin cycle occur in the dark?
Though it is called the “dark reaction”, the Calvin cycle does not actually occur in the dark or during night time. This is because the process requires NADPH, which is short-lived and comes from the light-dependent reactions.
Does the Calvin cycle require light?
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 reactants and products for both light and dark reactions?
Explanation: Both light dependant and dark reactions are types of photosynthetic reactions. Dark reactions occur in the grana of chlorophyll,and get energy from ATP and NADPH. The reactants are water and carbon dioxide.
Why do dark reactions depend on light reactions?
The cycle uses ATP and NADPH synthesized in the light-dependent reactions to drive its reactions forward. So although the cycle itself doesn’t use light energy, it does depend on the light reactions to provide it with the ATP and NADPH.
What is the similarities of light reaction and dark reaction?
Light reaction | Dark reaction |
---|---|
It occurs in the thylakoid membrane of the chloroplast. | It occurs in the stroma of the chloroplast. |
It depends on the sunlight. | It does not depend on the sunlight. |
Photolysis occurs in photosystem II. | Photolysis does not occur. |
ATP and NADPH are produced. | Glucose is produced. |
Why photosynthesis does not occur in the dark?
Plants can perform photosynthesis at night only if they are provided with the artificial light of the corresponding wavelengths. Photosynthesis is the process by which light energy is converted to chemical energy with the help of chlorophyll pigment, which absorbs light energy.
Where does light reaction occur?
In plants, the light reactions take place in the thylakoid membranes of organelles called chloroplasts. Photosystems, large complexes of proteins and pigments (light-absorbing molecules) that are optimized to harvest light, play a key role in the light reactions.
Why photosynthesis is called dark reaction?
Instead, dark reaction uses ATP and NADPH to produce energy molecules. No photosystem is required. Photolysis of water does not occur. So, the dark reaction in photosynthesis is called so because it does not require light energy.
Why doesn’t the Calvin cycle occur at night?
The Calvin cycle is a dark reaction because it does not need sunlight. Although it can happen during the day, this process does not require energy from the sun to work. Other names for the Calvin cycle include the Calvin-Benson cycle, light-independent reaction, carbon fixation and C3 pathway.
Why Calvin cycle is called dark reaction?
Only the light reaction directly uses light. The Calvin cycle is fueled by products from the light reaction, but doesn’t need light. Therefore it is called the dark reaction.
Does carbon fixation occur in the dark?
The assimilation of carbon into organic compounds is the result of a complex series of enzymatically regulated chemical reactions—the dark reactions. This term is something of a misnomer, for these reactions can take place in either light or darkness.
Do dark or light-independent reactions occur in plants only during the daytime?
Plants also use the compounds they make to build their own cell parts. Many students believe that the light-dependent reactions occur in the daytime and the light-independent reactions (sometimes called the “dark” reactions) occur at night when the plant can’t get sunlight, so it needs sugar.
Does photosynthesis occur at night?
During the day, photosynthesis is dominant, so there is a net release of oxygen. At night, photosynthesis stops but respiration continues, so there is a net consumption of oxygen.
Do not need light energy to power their reactions and can occur day or night?
Dark reactions or “light independent reactions” do not need light energy to power their reactions and can occur day or night. Discovered by three scientists, the dark reactions are also called the Calvin-Bensen-Bassham cycle or just Calvin Cycle.
Why is the dark stage called the dark stage?
In this cycle ATP and NADPH, produced in the light stage, provide the energy and electrons to change carbon dioxide (CO2) to carbohydrates (C H O) molecules. Although this stage is called the dark stage it occurs in light and also in darkness as long as the products of the light phase are still available.
What is the difference between light phase and dark phase in photosynthesis?
Light reaction | Dark reaction |
---|---|
It occurs in the thylakoid membranes of grana and stroma lamellae. | It occurs in the stroma of the chloroplast. |
Does light-dependent reactions require sunlight?
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.
Where do Calvin cycle reactions occur?
Unlike the light reactions, which take place in the thylakoid membrane, the reactions of the Calvin cycle take place in the stroma (the inner space of chloroplasts).
What happens dark reaction?
Light reactions | Dark reactions |
---|---|
It takes place in the grana of the chloroplast. | It occurs in the stroma of the chloroplast. |
Which process is most directly driven by light energy?
Photosynthesis: Photosynthesis is the process by which the chlorophyll molecules convert the light energy into chemical energy where there is the fixation of inorganic carbon into organic carbon with the help of light and provides food for the ecosystem.
What is the correct order for the reactions of the Calvin cycle?
The Calvin cycle has four main steps: carbon fixation, reduction phase, carbohydrate formation, and regeneration phase.
What is ADP and NADP?
ATP – Adenosine triphosphate. ADP – Adenosine diphosphate. NADP – Nicotinamide adenine dinucleotide phosphate. NADPH – The reduced form of NADP. In the Light Dependent Processes i.e Light Reactions, the light strikes chlorophyll a in such a way as to excite electrons to a higher energy state.
What is the difference between ps1 and ps2?
The main difference between photosystem 1 and 2 is that PS I absorbs longer wavelengths of light (>680 nm) whereas PS II absorbs shorter wavelengths of light (<680 nm).
Is oxygen used in dark reactions?
The reason these two processes occur at the same time is that photorespiration uses oxygen while giving out carbon dioxide and the dark reaction of photosynthesis uses carbon dioxide while giving out oxygen. Thus, these processes are often studied together to understand the efficiency of the plant system.
Is the dark stage anabolic or catabolic?
Answer and Explanation: This dark reaction or Calvin cycle is a very crucial anabolic reaction for photosynthetic organisms.
What is the site of dark reaction in photosynthesis?
They provide the energy that enable the plant to combine carbon dioxide with other compounds to make sugar. This activity occurs in the stroma of the chloroplast and does not require light. It is therefore known as the dark reaction of photosynthesis.
Which reaction is also called dark reaction?
The dark reaction is the second phase of photosynthesis which occurs in the stroma of chloroplasts. The reaction is also known as the biosynthetic phase or Blackman’s reaction or carbon dioxide fixation or Calvin cycle.
Does photosystem 1 occur before photosystem 2?
Photosystem I occurs before photosystem II during the light reactions. a collection of pigments that trap solar energy and focus it on reaction centers, releasing high-energy electrons.
What is light reaction also called?
The light reaction is also known as photolysis reaction and takes place in the presence of light. It usually takes place in the grana of chloroplasts. The photosystems have pigment molecules.
Can photosynthesis take place without sunlight?
At night, or in the absence of light, photosynthesis in plants stops, and respiration is the dominant process. The plant uses energy from the glucose it produced for growth and other metabolic processes.
Will plants grow in the dark?
ANSWER: In a strict sense, plants do not grow faster in the dark; they grow slower. However, plants seem to grow faster in insufficient light due to rapid cell elongation. In other words, they don’t grow faster, they simply stretch.
Why can photosynthesis only occur in the light?
ADP molecules, thus, formed during dark reaction are reconverted into ATP molecules during light reaction. Light is, thus, necessary for the process of photosynthesis to provide energy for the synthetic reactions.