Tag: respiratory quotient-basic

Questions Related to respiratory quotient-basic

R.Q. can vary due to

biology respiration and energy transfer respiratory quotient-basic respiration-plants respiratory quotient

  1. Temperature

  2. Respiratory substrate

  3. Light and oxygen

  4. Respiratory product.

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Correct Option: B
Explanation:

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.

So the correct option is 'Respiratory substrate'.

RQ is less than one for

biology respiration and energy transfer respiratory quotient-basic respiration-plants respiratory quotient

  1. Carbohydrate

  2. Organic acid

  3. Starch

  4. Protein

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Correct Option: D
Explanation:

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.

So, the correct answer is 'Protein'. 

The R.Q of a plant organ depends upon the nature of the substrate which is 

biology respiration and energy transfer respiratory quotient-basic respiration-plants respiratory quotient

  1. Reduced

  2. Oxidized

  3. Catabolized

  4. Metabolized

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Correct Option: B
Explanation:

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 

biology respiration and energy transfer respiratory quotient-basic respiration-plants respiratory quotient

  1. Fats

  2. Organic acid

  3. Proteins

  4. Carbohydrate

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Correct Option: B
Explanation:

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

biology respiration and energy transfer respiratory quotient-basic respiration-plants respiratory quotient

  1. $O _2$ taken in $/ CO _2$ evolved

  2. $CO _2$ evolved $/O _2$ taken in

  3. $O _2$ taken in $/H _2O$ evolved

  4. $CO _2$ taken in $H _2O$ evolved

Show answer
Correct Option: B
Explanation:
The respiratory quotient  is used for measurement of basal metabolic rate when estimated from CO$ _{2}$ production. It is measured using a respirometer and is calculated as the the ratio of CO$ _{2}$produced by the body to O$ _{2}$ consumed by the body. 
So, the correct option is 'CO$ _{2}$ evolved /O$ _{2}$taken in'

When the Respiratory Quotient (R.Q.) is greater than 1, it indicates

biology respiration and energy transfer respiratory quotient-basic respiration-plants respiratory quotient

  1. Only aerobic respiration is taking place

  2. Only anaerobic respiration is taking place

  3. Both aerobic and anaerobic respiration are taking place

  4. None of these

Show answer
Correct Option: D
Explanation:

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.

So, the correct option is 'none of these'. 

Value of R.Q. in succulents is ____________.
biology respiration and energy transfer respiratory quotient-basic respiration-plants respiratory quotient

  1. Unity

  2. Infinite

  3. Less than unity

  4. Zero

Show answer
Correct Option: D
Explanation:

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.

${2C} _{6}{H} _{12}{O} _{6}+{3O} _{2}\longrightarrow\underset {Malic \,acid}{{3C} _{4}{H} _{6}{O} _{5}}+{3H} _{2}O$
$R.Q.=\frac{Zero\,{CO} _{2}}{{3O} _{2}}=Zero$
So the correct option is D.

If volume of ${CO} _{2}$ liberated during respiration is more than the volume of ${O} _{2}$ used, then the respiratory substrate will be

biology respiration and energy transfer respiratory quotient-basic respiration-plants respiratory quotient

  1. Carbohydrate

  2. Fat

  3. Protein

  4. Organic acid

Show answer
Correct Option: D
Explanation:

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 $O _2$.
$RQ=\frac{4{CO} _{2}}{{O} _{2}}=4.0$.

So the correct option is D.

Among the following substances, which one has the highest Respiratory Quotient?

biology respiration and energy transfer respiratory quotient-basic respiration-plants respiratory quotient

  1. Glucose

  2. Malic acid

  3. Oxalic acid

  4. Palmitic acid

Show answer
Correct Option: A

RQ is more than one indicating

biology respiration and energy transfer respiratory quotient-basic respiration-plants respiratory quotient

  1. Aerobic respiration.

  2. Anaerobic respiration.

  3. Both A and B.

  4. None of the above.

Show answer
Correct Option: C
Explanation:

If RQ value is more than 1, the respiration would be aerobic and anaerobic respiration.

So the correct option is 'Aerobic respiration and Anaerobic respiration'.