Can the dark reaction occur in light?
The dark reaction of photosynthesis is not dependent on sunlight
but it does not mean it does not occur in its presence. 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.
Can dark reactions happen without light reactions?
Oxygen, released as a by-product, passes into the atmosphere through pores in the leaves. NADPH and ATP drive the second stage, the “dark” reactions (or Calvin cycle, discovered by Melvin Calvin), which
do not require light
.
Where does the dark reaction occur?
The dark reaction occurs
outside of the thylakoids
. In this reaction, the energy from ATP and NADPH are used to fix carbon dioxide (CO
2
). The products of this reaction are sugar molecules and other organic molecules necessary for cell function and metabolism.
Does dark reaction depend on light?
Dark reactions are called biosynthetic phase of photosynthesis.
Reason:
Dark reactions do not directly depend on the presence of light but are dependent on the products of the light reaction
, i.e., ATP and NADPH.
Does the dark reaction require sunlight?
The Calvin cycle is also called the dark reactions or light-independent reactions because it is the part that
doesn't need energy from the sun to happen
. The Calvin cycle takes place within the stroma of the chloroplast.
Does Calvin cycle occur in light or dark?
reactions” of the Calvin cycle actually occur in the dark
. The reality of the situation is that several enzymes in the so-called “dark reactions” are, in fact, indirectly dependent on the presence of light for their activity.
Can dark reactions occur in dark?
Dark reaction is also known as light-independent phase. Unlike, light reaction, it does not require light as an essential factor. Thus, can takes place both in the presence or absence of light.
The term dark reaction does not mean that it takes place only in dark period or at night
.
Where do light and dark reactions occur?
The light reactions of photosynthesis take place in the thylakoid membrane, whereas the dark reactions are located in the chloroplast stroma
.
Which event does not occur in light reactions?
Answer. Answer: C)
CO2,reduced into C6H1206
.
Does light reaction occur in Grana?
(i)
Light reactions occur in grana thylakoids
whereas dark reactions occur in stroma of chloroplasts.
Why are dark reactions called light-independent?
Therefore the dark reaction in photosynthesis is called so because
it don ot directly depend on light energy
. Dark reaction of photosynthesis has distinct chemical reactions which help in the transformation of carbon dioxide and other compounds to form glucose.
How do the light and dark reactions work together?
Photosynthesis takes place in two distinct stages. In the light reactions energy from sunlight drives the synthesis of ATP and NADPH coupled to the formation of O
2
from H
2
O. In the dark reactions so named because they do not require sunlight the ATP and NADPH produced by the light reactions drive glucose synthesis.
Can photosynthesis occur in the dark?
No, plants do not perform photosynthesis at night
. Plants can perform photosynthesis at night only if they are provided with the artificial light of the corresponding wavelengths.
Can photosynthesis occur without light?
Plants respire all the time, whether it is dark or light, because their cells need energy to stay alive. But
they can only photosynthesize when they have light
.
Does the Calvin cycle need 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.
Do light-independent reactions only occur at night?
Although the light-independent reactions do not use light as a reactant (and as a result
can take place at day or night
), they require the products of the light-dependent reactions to function.
Can Calvin cycle exist without light reaction?
1 Answer. Krishan T. Calvin-Benson cycle
would not be possible
without the light dependent reactions because it would lack ATP and NADPH2 molecules.
What reaction does not take place in the dark?
Solution : Dark reaction needs products of
light reaction like ATP and NADPH
hence cannot take place at night. Step by step video solution for [object Object] by Biology experts to help you in doubts & scoring excellent marks in Class 11 exams.
Does dark reactions of photosynthesis occur only at night?
This process takes place in the presence of light. Dark reaction of photosynthesis does not require light. 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.
Can the Calvin cycle occur in the darkness?
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.
Where are ps1 and ps2 located?
Photosystem I (PS I) and II (PS II) are found
in the thylakoid membranes inside the chloroplast
. The photosystems are responsible for carrying out photochemical phase or light reaction of photosynthesis.
How light reaction takes place and in what way it is different from dark reaction?
Light reaction and dark reaction are the two types of sequential processes that occur during the photosynthesis of plants.
Light reaction occurs in the thylakoid membrane of chloroplast whereas the dark reaction occurs in the stroma of the chloroplast
.
Where do the light and dark reactions occur in a chloroplast be able to identify the parts in a chloroplast diagram?
The light reactions take place in
the thylakoid
. There, water (H
2
O) is oxidized, and oxygen (O
2
) is released. The electrons that freed from the water are transferred to ATP and NADPH. The dark reactions then occur outside the thylakoid.
Which one of the following do not occur during photosynthesis?
Final step:
Oxidation of carbon to carbon dioxide
doesn't occur during photosynthesis.
Which of the following occurs in the light reactions of photosynthesis?
The light-dependent reactions use light energy to make two molecules needed for the next stage of photosynthesis:
the energy storage molecule ATP and the reduced electron carrier NADPH
. In plants, the light reactions take place in the thylakoid membranes of organelles called chloroplasts.
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.
Why do dark reactions occur in stroma?
| Light reactions Dark reactions | It takes place in the grana of the chloroplast. It occurs in the stroma of the chloroplast. |
|---|
Does light reaction occur in stroma?
The light reaction takes place in the discs
. During this process, ATP and NADPH are formed with the seven steps of the reaction starting from absorbing light and passing the electrons. The matrix of chloroplast cells is called stroma which is explained above.
Which reaction occur in grana?
Why light independent reactions Cannot take place during night?
– Calvin cycle require ATP & NADPH for production of glucose. – These ATP & NADPH are formed by light reactions. – So
dark reactions must occur alongside light reactions
. – Therefore, though dark reactions are light independent, they can't occur at night.
Can light reactions occur in the absence of light?
Explanation: Light dependent reactions(taking place in thylakoid discs)of photosynthesis
can't take place in absence of light
.
Can photosynthesis occur in the dark?
No, plants do not perform photosynthesis at night
. Plants can perform photosynthesis at night only if they are provided with the artificial light of the corresponding wavelengths.
Which stage of photosynthesis can function in the dark?
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.
