Tag: respiratory quotient-basic

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

R.Q. can vary due to

  1. Temperature

  2. Respiratory substrate

  3. Light and oxygen

  4. Respiratory product.
Reveal answer Fill a bubble to check yourself
B Correct answer
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'.

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

RQ is less than one for

  1. Carbohydrate

  2. Organic acid

  3. Starch

  4. Protein
Reveal answer Fill a bubble to check yourself
D Correct answer
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'. 

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

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

  1. Fats

  2. Organic acid

  3. Proteins

  4. Carbohydrate
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

Respiratory quotient may be represented as

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
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'
Multiple choice biology respiration and energy transfer respiratory quotient-basic respiration-plants respiratory quotient

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

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
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'. 

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

  1. Unity

  2. Infinite

  3. Less than unity

  4. Zero
Reveal answer Fill a bubble to check yourself
D Correct answer
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.

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

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

  1. Carbohydrate

  2. Fat

  3. Protein

  4. Organic acid
Reveal answer Fill a bubble to check yourself
D Correct answer
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.