Respiration-plants - class-XI
Description: respiration-plants | |
Number of Questions: 51 | |
Created by: Sara Dalvi | |
Tags: respiration plant anatomy and plant physiology respiration and energy transfer biology respiration in plants |
Respiratory quotient is
-
More than one for organic acids.
-
Less than one for proteins.
-
Equal to zero for CAM plants at night.
-
All of the above.
The respiratory quotient (R.Q) is the ratio of $CO _2$ produced to $O _2$ consumed, while food is being metabolized.
RQ = $CO _2$ eliminated / $O _2$ consumed
R.Q for proteins is less than 1 since, amount of $CO _2$ evolved is lesser than amount of $O _2$ consumed.
When organic acids are broken down as respiratory substrates under aerobic conditions the R.Q is more than one. Organic acids contain more oxygen than carbohydrates and therefore require less oxygen for their oxidation.
R.Q is equal to zero for CAM plants at night time since, no $CO _2$ is evolved and $O _2$ is continuously consumed.
Thus, option D is correct.
R. Q in anaerobic respiration is
-
0
-
${\propto }$
-
1
-
> 1
The respiratory quotient (RQ) is the ratio of $CO _2$ produced to $O _2$ consumed, while food is being metabolized.
RQ = $CO _2$ eliminated / $O _2$ consumed.
The value of RQ is infinity during anaerobic respiration, because $CO _2$ is produced but $O _2$ is not utilized. Thus, option B is correct and other options are incorrect.
${Q _{10}}$ is
-
Respiratory coefficient
-
Photosynthetic coefficient
-
Photosynthetic yield
-
Temperature coefficient
The respiratory quotient (or RQ or respiratory coefficient), is a dimensionless number used in calculations of basal metabolic rate (BMR), when estimated from carbon dioxide production.
RQ = CO$ _{2}$ eliminated / O$ _{2}$ consumed. Thus, option A is incorrect. Photosynthetic coefficient is the specific light spectrum at which chlorophyll absorbs light. Thus, option B is wrong. Photosynthetic yield is the quantity of the end product of the photosynthesis. Thus, option C is wrong. The temperature coefficient (Q$ _{10}$) represents the factor by which the rate (R) of a reaction increases for every 10-degree rise in the temperature (T). The rate (R) may represent any measure of the progress of a process. Thus option D is correct.
In CAM the R.Q will be
-
Zero
-
1
-
More than one
-
Less than one
CAM plants open their stomata only at night and absorbs $CO _2$, which then converted into malate by acidification. During night time oxygen is absorbed continuously but no $CO _2$ is evolved. There fore R.Q in night is zero. During day time, malate gets converted to $CO _2$ and $C _3$ photosynthesis occurs. During day time amount of $CO _2$ evolved is equal to the amount of $O _2$ absorbed. So, R.Q at day time is 1. So, in CAM plants, R.Q will be zero at night. Thus, option A is correct and other options are incorrect.
Protein rich pulses have R.Q. will be
-
One
-
More than one
-
Less than one
-
None of the above
The respiratory quotient (R.Q) is the ratio of $CO _2$ produced to $O _2$ consumed, while food is being metabolized.
RQ = $CO _2$ eliminated / $O _2$ consumed
R.Q for proteins is less than 1. Because, amount of $O _2$ consumed is higher than amount of $CO _2$ eliminated. So, protein rich pulses have R.Q less than 1. Thus, option C is correct and other options are incorrect.
R.Q of the succulents can be
-
0
-
1
-
0.7
-
Both (A) and (B)
CAM plants open their stomata only at night and absorbs $CO _2$, which then converted into malate by acidification. During night time oxygen is absorbed continuously but no $CO _2$ is evolved. There fore R.Q in night is zero. During day time, malate gets converted to $CO _2$ and $C _3$ photosynthesis occurs. During day time amount of $CO _2$ evolved is equal to the amount of $O _2$ absorbed. So, R.Q at day time is 1. Since succulents are CAM plants, their R.Q at night is zero and day is 1. Thus, option D is correct and other options are incorrect.
In succulent plants R.Q. is less than one because of
-
Complete oxidation
-
Complete reduction
-
Incomplete reduction
-
Incomplete oxidation
In succulent plants, the stomata are open during night and during this time plants absorb carbon dioxide. During day time stomata are closed and no carbon dioxide is evolved. These plants respire during night time, when they can take oxygen through open stomata. The volume of carbon dioxide is less than typical aerobic respiration. In fact during night time, these plants fix carbon dioxide into organic acids. The respiratory substrates are incompletely oxidised and thus, respiratory quotient is less than one.
In Opuntia ,the R.Q. will be
-
Equal to 1.
-
Less than 1.
-
More than 1.
-
Equal to 0.
Respiratory quotient (RQ) is defined as the ratio between volume of carbon dioxide released to volume of oxygen absorbed. Opuntia is a succulent plant. Succulents open their stomata in night, when atmospheric carbon dioxide is fixed temporarily into organic acids like oxaloacetate and malate. During daytime the stomata are closed and organic acids are decarboxylated to release carbon dioxide which is used in the synthetic processes of photosynthesis. As there is no net evolution of carbon dioxide, the value of RQ is zero in succulents like Opuntia.
The value of R.Q. for proteins is
-
Equal to one.
-
More than one.
-
Less than one.
-
Infinite.
During aerobic respiration, $O _2$ is consumed and $CO _2$ is released. The ratio of the volume of $CO _2$ evolved to the volume of $O _2$ consumed in respiration is called the respiratory quotient (R.Q) or respiratory ratio. The respiratory quotient depends upon the type of respiratory substrate used during respiration. When carbohydrates are used as substrate and are completely oxidised, the RQ will be 1, because equal amounts of $CO _2$ and $O _2$ are evolved and consumed, respectively. When fats are used in respiration, the RQ is less than 1. When proteins are respiratory substrates the ratio would be about 0.9.
What causes R. Q. to vary?
-
Respiratory substrates
-
Light and $O _2$
-
Respiratory products
-
Temperature
During aerobic respiration, $O _2$ is consumed and $CO _2$ is released. The ratio of the volume of $CO _2$ evolved to the volume of $O _2$ consumed in respiration is called the respiratory quotient (RQ) or respiratory ratio. The respiratory quotient depends upon the type of respiratory substrate used during respiration. When carbohydrates are used as substrate and are completely oxidised, the RQ will be 1, because equal amounts of $CO _2$ and $O _2$ are evolved and consumed, respectively. When fats are used in respiration, the RQ is less than 1. When proteins are respiratory substrates the ratio would be about 0.9.
R.Q. is less than one at the time of respiration of
-
Starch
-
Sugarcane
-
Glucose
-
Groundnut
Respiratory quotient or R.Q is defined as the ratio of carbon dioxide evolved to oxygen taken in for respiratory break down of a substrate. The value of R.Q for oxidation of carbohydrates is unity and less than one for oxidation of fats and proteins. Thus if groundnut, which stores fats is used as respiratory substrate the value of R.Q will be less than one.
The value of R.Q. for a starved cell is
-
Zero.
-
0.8 / less than one.
-
1 / unit.
-
Infinite.
During aerobic respiration, $O _2$ is consumed and $CO _2$ is released. The ratio of the volume of $CO _2$ evolved to the volume of $O _2$ consumed in respiration is called the respiratory quotient (RQ) or respiratory ratio. Thus the following expression is used to calculate the value of RQ.
RQ= volume of $CO _2$ evolved/ volume of $O _2$ consumed.
The respiratory quotient depends upon the type of respiratory substrate used during respiration. When carbohydrates are used as substrate and are completely oxidised, the RQ will be 1, because equal amounts of $CO _2$ and $O _2$ are evolved and consumed, respectively. When fats are used in respiration, the RQ is less than 1. When proteins are respiratory substrates the ratio would be about 0.9.
Under conditions of starvation carbohydrates are not available and proteins or fats are used as cellular fuel and hence the expected value of RQ is less than unity.
More CO$ _{2}$ is evolved than the volume of oxygen consumed when the respiratory substrate is
-
Fat
-
Sucrose
-
Glucose
-
Organic acid
R.Q. is the ratio of carbon dioxide evolved and the oxygen consumed during the process of respiration.
The value of R.Q. of a succulent plant at night is
-
< 1.
-
> 1.
-
Zero.
-
Infinite.
In succulent plants at night the stomata are open and carbon dioxide is fixed into organic acids. Thus at night there is no net carbon dioxide evolved. Hence, value of RQ is zero.
R.Q. of a germinating ground nut and castor seed is
-
1.
-
< 1.
-
> 1.
-
0.
The respiratory quotient depends upon the type of respiratory substrate used during respiration. When fats are used in respiration, the RQ is less than 1. Groundnut and castor seeds are fats storing seeds, the stored fats are mobilised during their seed germination. Hence, the RQ value is less than one for germinating groundnut and castor seeds.
R.Q. is more than one in the case of
-
Fat
-
Fructose
-
Glucose
-
Organic acid
R.Q. is the ratio of the volume of carbon dioxide evolved and oxygen consumed in respiration.
The value of R.Q. at the compensation point is
-
Infinity.
-
Two.
-
> 1.
-
Zero.
During aerobic respiration, $O _2$ is consumed and $CO _2$ is released. The ratio of the volume of $CO _2$ evolved to the volume of $O _2$ consumed in respiration is called the respiratory quotient (RQ) or respiratory ratio. Thus the following expression is used to calculate the value of RQ.
RQ= volume of $CO _2$ evolved/ volume of $O _2$ consumed.
At compensation point there is no net evolution of carbon dioxide. Hence, numerator in above expression is zero, giving the value of RQ as zero.
The R.Q. value of a ripening fatty seed is
-
< 1.
-
> 1.
-
Zero.
-
Infinity.
During the ripening of oil-seeds, when fats are formed from carbohydrates the respiratory quotient is greater than 1. This arises because part of the oxygen consumed in respiration is derived from carbohydrates.
R.Q. of an actively photosynthesizing tissue is
-
Infinity.
-
< 1.
-
> 1.
-
Zero.
During aerobic respiration, O$ _2$ is consumed and CO$ _2$ is released. The ratio of the volume of CO$ _2$ evolved to the volume of O$ _2$ consumed in respiration is called as the respiratory quotient (RQ) or respiratory ratio. Thus, the following expression is used to calculate the value of RQ.
RQ = volume of CO$ _2$ evolved/ volume of O$ _2$ consumed.
In an actively photosynthesizing tissue, the net volume of carbon dioxide evolved (i.e., volume of carbon dioxide produced in respiration minus that utilised in photosynthesis) is equal to net volume of oxygen (i.e., volume of oxygen consumed in respiration minus that evolved in photosynthesis).
When the evolution of $CO _2$ is more than the intake of $O _2$, the respired substrate should be
-
Fatty acid.
-
Organic acid.
-
Glucose.
-
Polysaccharide.
The respiratory quotient depends upon the type of respiratory substrate used during respiration. When organic acids are metabolised more carbon dioxide is evolved than oxygen consumed. Hence, the value of RQ is more than one.
Respiratory quotient of which diet is less than unity?
-
Carbohydrate
-
Fats
-
Organic acid
-
Sugar
Respiratory quotient (RQ) is defined as the volume of carbon dioxide released to the volume of oxygen absorbed during the process of aerobic respiration.
The respiratory quotient of carbohydrate is
-
Unity.
-
Greater than unity.
-
Less than unity.
-
Equal to five.
Respiratory quotient is defined as the volume of carbon dioxide released to the volume of oxygen consumed during the respiration process. Its value is one for oxidation of carbohydrates and less than one for oxidation of fats and proteins. The value is more than one for oxidation of organic acids.
In succulents, respiratory quotient is less than one due to
-
Incomplete oxidation
-
Incomplete reduction
-
Complete reduction
-
Complete oxidation
R.Q. is ratio of
-
CO$ _2$ produced to substrate consumed
-
CO$ _2$ produced to O$ _2$ consumed
-
Oxygen consumed to water produced
-
Oxygen consumed to CO$ _2$ produced.
R.Q stands for respiratory quotient or respiratory ratio. It is the volume of CO$ _2$evolved to the volume of O$ _2$ consumed. It depends upon the type of respiratory substrate used during respiration. When carbohydrates are used as a substrate and are oxidized completely the RQ is 1. For fats, it is less than 1 and for proteins, it is 0.9.
RQ of which diet is less than unit?
-
Carbohydrate
-
Fats
-
Organic acid
-
Sugar
Respiratory quotient (RQ) is defined as volume of carbon dioxide released to volume of oxygen absorbed during the process of aerobic respiration of a substrate.
Which one yields the highest energy per gram
-
Carbohydrate
-
Protein
-
Fat
-
Amino acids
Our food contains three main constituents: carbohydrates, fats and proteins. The amount of energy released when one gram of any of these food elements is burned is known as calorific value. Thus calorific value of food indicates as to how much is the energy value of food which the human body can gain through metabolism. It is usually given in kcal/gm. Fats form the most concentrated source of energy in our diet. 1 gram of fat yields 9.5 kcal of energy which is the highest among the food components. 1 gram of carbohydrates and proteins yield almost similar amount of energy which is equal to 4 kcal.
R.Q. would depend upon
-
Nature of enzymes
-
Nature of substrate
-
Amount of CO$ _2$ released
-
Amount of O$ _2$ utilised
Respiratory Quotient (R.Q.) is the ratio of the volume of CO$ _{2}$ released to the volume of O$ _{2}$ consumed in a respiration process. It depends on the nature of the substrate and its capacity of using O$ _{2}$ and releasing CO$ _{2}$. For example, glucose consumes 6 CO$ _{2}$ and releases 6 O$ _{2}$, so its R.Q. is 1.
R.Q. is one in case of
-
Fatty acids
-
Carbohydrates
-
Nucleic acid
-
Organic acids
Respiratory quotient (R.Q.) is
-
Volume of O$ _2$ evolved / Volume of CO$ _2$ consumed
-
Volume of CO$ _2$ evolved / Volume of O$ _2$ consumed
-
Volume of O$ _2$ consumed / Volume of CO$ _2$ evolved
-
Volume of CO$ _2$ consumed / Volume of O$ _2$ evolved
Respiratory quotient or R.Q. is the ratio of volume of CO$ _2$ produced to volume of O$ _2$ consumed during cellular respiration. It is measured by Ganong's Respirometer. R.Q. for carbohydrates is 1, organic acid is >1 and fats and proteins is <1.
Compensation point is the value of a factor where there is
-
Beginning of photosynthesis
-
Little photosynthesis
-
Photosynthesis equal to rate of respiration
-
Neither photosynthesis nor respiration
Compensation point is the value of a factor where the rate of photosynthesis is equal to the rate of respiration. At this point, carbon dioxide released from respiration is equivalent to that which is taken up during photosynthesis. When the light intensity increases, the compensation point is reached. When light intensity is increased beyond the compensation point, the rate of photosynthesis increases proportionally until the point of light saturation is reached. Beyond light saturation point, the rate of photosynthesis is no longer affected by light intensity. Compensation point varies in different species of plants. It even varies in response to changes in temperature and other environmental factors.
R.Q. can vary due to
-
Temperature
-
Respiratory substrate
-
Light and oxygen
-
Respiratory product.
The respiratory quotient depends on the type of respiratory substrate which is to release energy for the synthesis of ATP. If the respiratory substrate is a lipid, it consists carbon-hydrogen bonds mean more ATP is produced from them in respiration. This also means more oxygen is required to break them down, so has an RQ of less than one and if the substrate is glucose the RQ is 1.
RQ is less than one for
-
Carbohydrate
-
Organic acid
-
Starch
-
Protein
R.Q. is the ratio of amount of CO$ _2$ produced to the amount of O$ _2$ consumed by the cell for respiration. R.Q. value of protein is 0.8 as the volume of carbon dioxide released is less than the amount of oxygen. Carbohydrates, organic acid and starch have R.Q. of 1 or greater than 1.
The R.Q of a plant organ depends upon the nature of the substrate which is
-
Reduced
-
Oxidized
-
Catabolized
-
Metabolized
Respiratory quotient is the value, which depends upon the oxidation of respiratory substrate. It is calculated by amount of $CO _2$ eliminated to that of $O _2$ consumed.
If the volume of $CO _{2}$ liberated during respiration is more than the volume of $O _{2}$ used the respiratory substances will be
-
Fats
-
Organic acid
-
Proteins
-
Carbohydrate
Organic acids have more volume of $CO _2$ liberated during respiration than the volume of $O _2$ used. Therefore, the R.Q. value will be greater than one. E.g., R.Q of oxalic acid is 4.
Respiratory quotient may be represented as
-
$O _2$ taken in $/ CO _2$ evolved
-
$CO _2$ evolved $/O _2$ taken in
-
$O _2$ taken in $/H _2O$ evolved
-
$CO _2$ taken in $H _2O$ evolved
When the Respiratory Quotient (R.Q.) is greater than 1, it indicates
-
Only aerobic respiration is taking place
-
Only anaerobic respiration is taking place
-
Both aerobic and anaerobic respiration are taking place
-
None of these
The respiratory quotient is used in calculations of BMR when estimated from carbon dioxide production. It is calculated from the ratio of carbon dioxide produced by the body to oxygen consumed by the body. A value of 0.7 indicates that lipids are being metabolized, 0.8 for proteins, and 1.0 for carbohydrates. RQ can be used as an indicator of over or underfeeding. Underfeeding, which forces the body to utilize fat stores, will lower the RQ and is marked by an RQ below 0.85, while overfeeding, which causes lipogenesis, will increase it and is indicated by RQ greater than 1.0.
-
Unity
-
Infinite
-
Less than unity
-
Zero
Succulents do not evolve carbon dioxide during the night (when their stomata are open) as the same is in carbon fixation. They also change carbohydrates to organic acids which utilise oxygen but do not evolve carbon dioxide.
$R.Q.=\frac{Zero\,{CO} _{2}}{{3O} _{2}}=Zero$
If volume of ${CO} _{2}$ liberated during respiration is more than the volume of ${O} _{2}$ used, then the respiratory substrate will be
-
Carbohydrate
-
Fat
-
Protein
-
Organic acid
RQ slightly more than unity is found when organic acids are broken down as respiratory substrates under aerobic conditions, e.g. for the breakdown of oxalic acid liberation of $CO _2$ is more than $O _2$.
$RQ=\frac{4{CO} _{2}}{{O} _{2}}=4.0$.
Among the following substances, which one has the highest Respiratory Quotient?
-
Glucose
-
Malic acid
-
Oxalic acid
-
Palmitic acid
RQ is more than one indicating
-
Aerobic respiration.
-
Anaerobic respiration.
-
Both A and B.
-
None of the above.
If RQ value is more than 1, the respiration would be aerobic and anaerobic respiration.
A value of RQ less than one means
-
Carbohydrates are used as respiratory material.
-
Organic acids are used as respiratory substances.
-
Oxidation of respiratory substrate consume more O$ _2$ than CO$ _2$ released.
-
Oxidation of respiratory substrate consume less O$ _2$ than CO$ _2$ released The reaction is anaerobic.
When the RQ value is less than one for fats, as fats consume more oxygen for respiration than carbohydrates.
In a germinating seed, when protein is aerobically oxidized, the R.Q. value will be
-
Less than one
-
More than one
-
Zero
-
One
The respiratory quotient (RQ) is the ratio of
RQ = CO$ _{2}$ eliminated / O$ _{2}$ consumed.
When carbohydrates are being oxidized in the organism and the requisite oxygen is available, the RQ is 1. In the oxidation of fats, the RQ is 0.7 and in the oxidation of proteins, 0.8. Whenever the substrate is protein, RQ is always less than one (0.5-0.9). So, in germinating seeds, when protein is aerobically oxidized, the R.Q value will be less than one. Thus, option A is correct and other options are incorrect.
Identify the sequence of steps involved during inspiration in rabbit.
(A) Volume of thoracic cavity increases
(B) Contraction of external intercostal muscles moves the rib cage forward
(C) Diaphragm becomes flat
(D) Thoracic cavity expands drawing air into lungs.
-
(C)$\rightarrow$(B)$\rightarrow$ (A)$\rightarrow$(D)
-
(C)$\rightarrow$(A)$\rightarrow$ (B)$\rightarrow$ (D)
-
(A)$\rightarrow$(B)$\rightarrow $(C)$\rightarrow$ (D)
-
(A)$\rightarrow$(D)$\rightarrow$ (B) $\rightarrow$ (C)
The urge to breathe comes from the respiratory center, located at the base of brain. It sends signals via the spinal cord to diaphragm and the muscles between ribs telling them when to contract or relax. During inspiration, the diaphragm -- the large muscle that divides chest and abdomen -- contracts and moves downward. Additionally, ribs move outward. This enlarges your chest and lungs expand. Lung expansion creates a vacuum. Air enters the nose and mouth and is pulled into windpipe -- the trachea. The trachea divides into smaller airways called bronchi. These continue to divide as they get farther from the trachea, like the branches of a tree. Finally, the tiny airways deliver the air to the smallest structures in your lung -- the alveoli -- where gas exchange takes place.
If volume of ${CO _2}$ given out during respiration is more than the volume of ${O _2}$ used the respiratory substrate will be
-
Carbohydrate
-
Fat
-
Protein
-
Organic fat
The respiratory quotient (RQ) is the ratio of CO$ _{2}$ produced to O$ _{2}$ consumed while food is being metabolized.
RQ = CO$ _{2}$ eliminated/O$ _{2}$ consumed.
The respiratory quotient for carbohydrate metabolism can be demonstrated by the chemical equation for oxidation of glucose.
C$ _{6}$H$ _{12}$O$ _{6}$ + 6 O$ _{2}$ 6 CO$ _{2}$+ 6 H$ _{2}$O
Because the gas exchange in this reaction is equal, the respiratory quotient for carbohydrates is: RQ = 6 CO2 / 6 O2 = 1. Thus, option A is wrong.
The chemical composition of fats differs from that of carbohydrates in that fats contain considerably fewer oxygen atoms in proportion to atoms of carbon and hydrogen. The substrate utilization of palmitic acid is:
C$ _{16}$H$ _{32}$O$ _{2}$ + 23 O$ _{2}$ 16 CO$ _{2}$ + 16 H$ _{2}$O
Thus, the RQ for palmitic acid is approximately 0.7. RQ = 16 CO$ _{2}$ / 23 O$ _{2}$ = 0.696. Thus, option B is wrong.
The respiratory quotient for protein metabolism can be demonstrated by the chemical equation for oxidation of albumin:
C$ _{72}$H$ _{11}$2N$ _{18}$O$ _{2}$S + 77 O$ _{2}$ 63 CO$ _{2}$ + 38 H$ _{2}$O + SO$ _{3}$ + 9 CO(NH$ _{2}$)2
The RQ for protein is approximately 0.8. RQ = 63 CO$ _{2}$/ 77O$ _{2}$ = 0.8. Thus, option C is wrong.
In case of organic fats, volume of CO$ _{2}$ given out during respiration is more than the volume of O$ _{2}$ used. Thus, option D is correct.
RQ of sprouting potato is
-
1
-
>1
-
<1
-
Zero
RQ value = volume of CO$ _2$ evolved/volume of O$ _2$ consumed.
R.Q. of anaerobic respiration is
-
Zero
-
Less than 1
-
1
-
More than 1
The utilization of oxygen is nill in anaerobic respiration. Hence the R.Q. value is infinity.
Respiratory quotient may be represented as
-
${O} _{2}$ taken in/${CO} _{2}$ evolved
-
${CO} _{2}$ evolved/${O} _{2}$ taken in
-
${O} _{2}$ taken in
-
${CO} _{2}$ taken in
During aerobic respiration, ${O} _{2}$ is consumed and ${CO} _{2}$ is released. The ratio of the volume of ${CO} _{2}$ evolved to the volume of ${O} _{2}$ consumed in respiration over a period of time is called as respiratory quotient (RQ) or respiratory ratio.
$RQ=\frac{Volume\,\, of\,\, {CO} _{2} \,\,evolved}{Volume \,\,of \,\,{O} _{2} \,\,consumed}$.
The most common respiratory substrate is
-
Glucose
-
Sucrose
-
Maltose
-
Glycogen
The various organic substances such as carbohydrates, fats and proteins are respired completely to carbon dioxide and water are called respiratory substrates. Under natural conditions only carbohydrates are used. Glucose being the simplest monosaccharide hexose molecule acts as the chief respiratory substrate.
Respiratory quotient is defined as
-
$O _2$ evolved / $CO _2$ absorbed
-
$CO _2$ evolved / $O _2$ absorbed
-
$CO _2$ evolved
-
$CO _2$ absorbed/ $O _2$ evolved.
Compensation point is the value of the factor where there is
-
Neither photosynthesis nor respiration
-
Little photosynthesis
-
Photosynthesis is equal to the rate of respiration
-
Beginning of photosynthesis
The compensation point is the light intensity on the light curve for which the rate of photosynthesis is equal to the rate of respiration in the plant cell i.e., the rate of cellular fixation of Carbon dioxide through photosynthetic pathway is equal to the respiratory release of Carbon-dioxide and the release of Oxygen by photosynthesis is equals to the rate of consumption by respiration in a plant cell. At the compensation point, the organism is not building any biomass nor consuming any biomass.
The respiratory quotient during cellular respiration would depend upon
-
Amount of $CO _{2}$ released
-
Amount of $O _{2}$ utilized
-
The nature of enzyme in invoked
-
Nature of substrate
-
Both (a) and (b)
The respiratory quotient (R.Q) is the ration of the volume of the CO$ _{2}$ released to the volume of the O$ _{2}$ utilized by a substrate during the process of respiration. It solely depends on the nature of the substrate. The R.Q. reflect the nature of the substrate, for example, R.Q. 1 indicated that glucose is the respiratory substrate.