Tag: respiratory quotient-basic

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

Respiratory quotient of which diet is less than unity?

  1. Carbohydrate

  2. Fats

  3. Organic acid

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

Respiratory quotient (RQ) is defined as the volume of carbon dioxide released to the volume of oxygen absorbed during the process of aerobic respiration. 

As fats are considerably much more reduced form of carbon as compared to carbohydrates and organic acids, their respiration requires much more oxygen as compared to respiration of sugars (carbohydrates) or organic acids. Thus, the value of RQ for fats is less than one.

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

The respiratory quotient of carbohydrate is

  1. Unity.

  2. Greater than unity.

  3. Less than unity.

  4. Equal to five.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

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.

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

In succulents, respiratory quotient is less than one due to

  1. Incomplete oxidation

  2. Incomplete reduction

  3. Complete reduction

  4. Complete oxidation
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Where incomplete oxidation of carbohydrates takes place R.Q is zero. In such cases oxygen absorbed does not oxidise the carbohydrates completely to carbon dioxide and water.
This occurs especially in respiration of succulent plants. In such plants respiration of carbohydrates occurs at night when stomata are open which results in the production of organic acids that utilise O₂ but do not evolve CO₂.
So, the correct option is 'Incomplete oxidation'
Multiple choice biology respiration and energy transfer respiratory quotient-basic respiration-plants respiratory quotient

R.Q. is ratio of

  1. CO$ _2$ produced to substrate consumed
  2. CO$ _2$ produced to O$ _2$ consumed

  3. Oxygen consumed to water produced
  4. Oxygen consumed to CO$ _2$ produced.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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.

So, the correct option is 'CO$ _2$ produced to O$ _2$  consumed'.

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

RQ of which diet is less than unit?

  1. Carbohydrate

  2. Fats

  3. Organic acid

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

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. 

The value of RQ for carbohydrates is unity. 
Fats are comparatively more reduced. They have much more carbon and less of oxygen. Hence, oxidation of fats requires a lot of oxygen to release same amount of carbon dioxide. As a consequence the value of RQ for oxidation of fats is less than unity.

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

Which one yields the highest energy per gram

  1. Carbohydrate

  2. Protein

  3. Fat

  4. Amino acids
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

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. 

Thus, the correct answer is option C. 

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

R.Q. would depend upon

  1. Nature of enzymes

  2. Nature of substrate
  3. Amount of CO$ _2$ released
  4. Amount of O$ _2$ utilised
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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.

 Hence, the correct answer is 'Nature of substrate'

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

Respiratory quotient (R.Q.) is

  1. Volume of O$ _2$ evolved / Volume of CO$ _2$ consumed
  2. Volume of CO$ _2$ evolved / Volume of O$ _2$ consumed
  3. Volume of O$ _2$ consumed / Volume of CO$ _2$ evolved
  4. Volume of CO$ _2$ consumed / Volume of O$ _2$ evolved
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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.

So, the correct answer is 'Volume of CO$ _2$ evolved / Volume of O$ _2$ consumed'.

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

Compensation point is the value of a factor where there is

  1. Beginning of photosynthesis

  2. Little photosynthesis

  3. Photosynthesis equal to rate of respiration

  4. Neither photosynthesis nor respiration
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

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.