Tag: respiration in plants

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Questions Related to respiration in plants

Multiple choice biology respiration in plants fermentation cell respiration living organisms and energy production

Lactic acid fermentation does not produce

  1. ATP.
  2. CO$ _2$ and NADH.

  3. Lactate.
  4. NAD$^+$.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In lactic acid fermentation, the 3-carbon pyruvate is converted to the 3-carbon lactic acid. Also NAD$^{+}$ is regenerated in the process, allowing glycolysis to continue to make ATP in anaerobic conditions. Hence lactate and NAD$^{+}$ are the direct products and ATP is the indirect product of lactic acid fermentation. NADH act as a reducing agent here, while CO$ _{2}$ is a product of alcohol fermentation.

Multiple choice biology respiration in plants fermentation cell respiration living organisms and energy production

Anaerobic process after glycolysis is known as

  1. TCA cycle

  2. Krebs cycle

  3. Calvin cycle

  4. None of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A) Lactic acid fermentation is the process that occurs after glycolysis when there is lack of oxygen.

B) TCA or Krebs cycle occurs glycolysis in the presence of oxygen and converts Acetyl coenzyme into oxaloacetic acid to yield ATP.
C) Calvin cycle is the common pathway for $C _3$ and $C _4$ plants.
So the correct option is 'None of the above'.

Multiple choice biology respiration in plants fermentation cell respiration living organisms and energy production

End product of fermentation of sugars is

  1. Water and carbon dioxide

  2. Alcohol and carbon dioxide

  3. Carbon dioxide

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

Fermentation is a type of anaerobic respiration in which the glucose is broken down into pyruvic acid in the absence of oxygen. During fermentation of sugars, this pyruvic acids coverts to a 2C acetaldehyde and then to ethanol and CO₂. All this takes place in the cytoplasm.

So, the correct option is 'Alcohol and carbon dioxide'

Multiple choice biology respiration in plants fermentation cell respiration living organisms and energy production

Fermentation products of yeast are

  1. H$ _2$O + CO$ _2$
  2. Methyl alcohol + CO$ _2$

  3. Methyl alcohol + Water
  4. Ethyl alcohol + CO$ _2$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Unicellular organisms like yeast undergo an alternate pathway of respiration in which an organic substrate is broken down in absence of oxygen. The end products are alcohol and CO$ _2$. Such a process is called alcoholic fermentation. In Yeast, the fermentation products are ethyl alcohol and carbon dioxide.

So the answer is 'Ethyl alcohol + CO$ _2$'.

Multiple choice biology respiration in plants fermentation cell respiration living organisms and energy production

Conversion of sugar into alcohol during fermentation is due to direct action of

  1. Temperature

  2. Concentration of sugar

  3. Zymase

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

Conversion of sugar to alcohol directly was found in yeast fermentation in which glucose was converted to ethyl alcohol and CO$ _2$. The conversion happens in presence of an enzyme called zymase which is found naturally in yeast. So, the answer is 'Zymase'.

Multiple choice biology respiration in plants fermentation cell respiration living organisms and energy production

 Anaerobic respiration of animals/humans produces

  1. Glucose and O$ _2$
  2. C$ _2$H$ _5$OH and CO$ _2$

  3. Lactic acid and water
  4. CO$ _2$ and H$ _2$O
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Cellular respiration in animals is predominantly aerobic in nature. However in stressful conditions, the respiration turns anaerobic to meet the energy demands. End products of anaerobic respiration are lactic acid and water. End products in plants for aerobic respiration are alcohol and carbon dioxide.

So the answer is 'Lactic acid and water'.

Multiple choice biology respiration in plants fermentation cell respiration living organisms and energy production

Select suitable name for the process
C$ _6$H$ _{12}$O$ _6$ + 2ADP + Pi 2C$ _2$H$ _5$OH + CO$ _2$ + 2ATP

  1. Photorespiration.

  2. Lactate fermentation.

  3. Aerobic respiration.

  4. Alcoholic fermentation.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The given process is alcoholic respiration and is done by the yeast in which two molecules of ATP, carbon dioxide and alcohol is released and the process takes place in the absence of oxygen.

So the correct option is 'Alcoholic fermentation.'

Multiple choice biology respiration in plants fermentation cell respiration living organisms and energy production

For formation of ethanol, pyruvic acid is first changed to acetaldehyde by enzyme

  1. Pyruvate dehydrogenase

  2. Pyruvate decarboxylase

  3. Alcohol oxidase

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

Alcoholic fermentation employs the conversion of pyruvic acid to ethanol for the release of energy. This is an incomplete oxidation in which aldehyde is first formed as an intermediate which is then further oxidised to alcohol. Pyruvic acid to acetaldehyde conversion is brought about by pyruvate decarboxylase which releases CO2.

So the answer is 'Pyruvate decarboxylase'.

Multiple choice biology respiration in plants fermentation cell respiration living organisms and energy production

Ethanol is formed from acetaldehyde by an enzyme called

  1. Lactate dehydrogenase

  2. Pyruvate kinase

  3. Alcohol dehydrogenase

  4. Pyruvate decarboxylase
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Alcoholic fermentation occurs in the absence of O2 and is a type of anaerobic respiration in which the end products are CO2 and alcohol. Aldehyde is an intermediate product in fermentation and is further oxidised to alcohol with the help of an enzyme called dehydrogenase. So ethanol is formed from acetaldehyde with the help of alcohol dehydrogenase.

Hence the answer is 'Alcohol dehydrogenase'.

Multiple choice biology respiration in plants fermentation cell respiration living organisms and energy production

In which one of the following processes CO$ _2$ is not released

  1. Aerobic respiration in animals.

  2. Alcoholic fermentation.

  3. Lactate fermentation.

  4. Aerobic respiration in plants.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In lactic acid fermentation which occurs in the absence of oxygen like fermentation after glycolysis form lactate which gets deprotonated to form lactic acid while in fermentation acetaldehyde converts into alcohol by deprotonation of it.

As lactate does not contain any oxygen in it that is the reason at the end carbon dioxide is not formed.
So the correct option is 'Lactate fermentation'.