Why does oxygen production stop without light?
Plants produce oxygen as a waste product of making sugar using sunlight, carbon dioxide, and water. If a plant needs energy, but doesn’t have sunlight, then it can burn the sugar that it made back when it had sunlight, and doing so requires oxygen.
What is an important difference between light-dependent?
Which is an important difference between light-dependent (L-D) and light-independent (L-IND) reactions in photosynthesis? The L-D reactions need CO2 and light energy, and the L-IND reactions needs water and O2. The L-D reactions require light energy and water, and the L-IND reactions require ATP, NADPH and CO2.
What is the main difference between light dependent and independent reactions?
In the light-dependent reactions, energy from sunlight is absorbed by chlorophyll and that energy is converted into stored chemical energy. In the light-independent reactions, the chemical energy harvested during the light-dependent reactions drives the assembly of sugar molecules from carbon dioxide.
How does light dependent reaction happen?
In the light-dependent reactions, which take place at the thylakoid membrane, chlorophyll absorbs energy from sunlight and then converts it into chemical energy with the use of water. The lower energy form, NADP+, picks up a high energy electron and a proton and is converted to NADPH.
What is another name for the light independent reaction?
Calvin-Benson cycle
What is another name for the dark reaction?
The Calvin cycle is sometimes also called the dark reaction because none of its steps require light.
What is the end product of light-independent reaction?
GA3P and oxygen are products. In photosynthesis, water, carbon dioxide, ATP, and NADPH are reactants. RuBP and oxygen are products.
Why is it called the light-independent reaction?
These reactions are also called the light-independent reactions because they are not directly driven by light. In the Calvin cycle, carbon atoms from CO2start text, C, O, end text, start subscript, 2, end subscript are fixed (incorporated into organic molecules) and used to build three-carbon sugars.
Can the light-independent reactions occur in the dark?
There are three phases to the light-independent reactions, collectively called the Calvin cycle: carboxylation, reduction reactions, and ribulose 1,5-bisphosphate (RuBP) regeneration. Though it is called the “dark reaction”, the Calvin cycle does not actually occur in the dark or during night time.
Why is the light-independent reaction important?
The light-independent reactions use the ATP and NADPH from the light-dependent reactions to reduce carbon dioxide and convert the energy to the chemical bond energy in carbohydrates such as glucose.
Why does it take 3 turns before producing a G3P?
Because the G3P exported from the chloroplast has three carbon atoms, it takes three “turns” of the Calvin cycle to fix enough net carbon to export one G3P. But each turn makes two G3Ps, thus three turns make six G3Ps.
What is full form of RuBP?
Ribulose 1,5-bisphosphate (RuBP) is an organic substance that is involved in photosynthesis. It is a colourless anion, a double phosphate ester of the ketopentose (ketone-containing sugar with five carbon atoms) called ribulose. Salts of RuBP can be isolated, but its crucial biological function happens in solution.
Where do light reactions produce ATP?
thylakoid membrane
Why is the term dark reaction inaccurate in photosynthesis?
In the dark reaction of photosynthesis, the ATP and NADPH formed in the light reaction are used to transform inorganic carbon dioxide (CO2) into organic carbon compounds, a process called carbon fixation. The term dark reaction is misleading because the process can take place in both light and darkness.
Why is the term dark reaction inaccurate in photosynthesis quizlet?
When discussing photosynthesis, some people mistakenly talk about the light reactions and the dark reactions. Why is “dark reactions” an inaccurate name for the Calvin cycle? This implies that the Calvin cycle occurs only at night. Why do plants produce O2?
What is the main difference between C3 and C4 carbon fixation?
C3 vs C4 Plants
| C3 Plants | C4 Plants |
|---|---|
| Photorespiration is not suppressed | Photorespiration is suppressed |
| Carbon dioxide fixation is slow. | Carbon dioxide fixation is faster. |
| Photosynthesis occurs when stomata are open | Photosynthesis occurs even when stomata are closed. |
Why is ATP needed for dark reactions?
Dark reaction is also known as Calvin Benson cycle. In this reaction the sunlight is not needed. The ATP is formed in first step of the photosynthesis and used in the body for the energy so the inorganic needs to be transformed into the carbohydrate. So the ATP is necessary in the dark reaction.
What is the purpose of dark reaction?
The dark reaction occurs outside of the thylakoids. In this reaction, the energy from ATP and NADPH are used to fix carbon dioxide (CO2). The products of this reaction are sugar molecules and other organic molecules necessary for cell function and metabolism.
How many ATP are used in dark reaction?
6 ATP
What reaction uses ATP in photosynthesis?
Light Reactions
How is ADP converted to ATP?
ADP is converted to ATP for the storing of energy by the addition of a high-energy phosphate group. The conversion takes place in the substance between the cell membrane and the nucleus, known as the cytoplasm, or in special energy-producing structures called mitochondria.
How do plants use ATP?
ATP can be used to store energy for future reactions or be withdrawn to pay for reactions when energy is required by the cell. Likewise, plants capture and store the energy they derive from light during photosynthesis in ATP molecules.
What are 3 things ATP is used for in cells?
Chemical. Three things that ATP does for cells are: Transport – mainly active transport or moving substances against a concentration gradient. Mechanical – described as muscle contractions, blood circulation and overall movement of cells.