Tag: respiration in plants

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

Enzyme required to oxidise acetaldehyde is

  1. Ethanol oxidase

  2. Acetaldehyde dehydrogenase

  3. Alcohol hydrogenase

  4. Glyceraldehyde dehyadrogenase
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Acetaldehyde dehydrogenase enzyme oxidises acetaldehyde into acetate. This enzyme belongs to class of aldehyde dehydrogenases. Acetaldehyde is produced from the metabolism of alcohol by the enzyme alcoholic dehydrogenase. Acetaldehyde is toxic and its accumulation can lead to effects of hangover so it needs to be metabolized. It is converted into acetate by aldehyde dehydrogenase. Acetate is then converted into carbon dioxide and water. These metabolic reactions occur in liver.
So, the correct answer is 'Acetaldehyde dehydrogenase'.
Multiple choice biology respiration in plants fermentation cell respiration living organisms and energy production

In Yeast, anaerobic respiration produces

  1. $CO _2$ and ethanol
  2. $CO _2$ and water
  3. $O _2$ and lactic acid
  4. $O _2$ and pyruvic acid
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Yeast can undergo both aerobic respiration or anaerobic respiration. In anaerobic respiration, glucose is utilized and carbon dioxide and ethanol are formed. It is also called as alcoholic fermentation. In aerobic respiration, water and carbon dioxide are produced.

Thus, the correct answer is option A.

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

With reference to the products of microbial fermentation, which one of the following pairs is correctly matched?

  1. Lactic acid- Rhizopus stolonifer

  2. Vinegar- Acetobacter sp.
  3. Vitamin $B12$- Streptomyces griseus

  4. B-amylase- Saccharomyces sp.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Rhizopus stolonifer is a fungus known for producing lactic acid through fermentation. While other options have errors (e.g., Acetobacter produces acetic acid, not vinegar directly as a species name), this is the most accurate pairing provided.

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

Enzyme that changes glucose to ethyl alcohol is

  1. Zymase

  2. Diastase

  3. Invertase

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

A) Zymase causes the breakdown of sugars into alcohols.

B) Diastase catalyses the breakdown of starch into maltose.
C) Invertase is an enzyme that catalyses the breakdown of sucrose into fructose and glucose.
D) Maltase breaks down maltose to glucose.
So the correct answer is 'Zymase'

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

During lactic acid fermentation

  1. $O _2$ is used, $CO _2$ is liberated
  2. Neither $O _2$ is used nor $CO _2$ liberated
  3. $O _2$ is not used, $CO _2$ is liberated
  4. $O _2$ is used, $CO _2$ is not liberated
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In all organisms, during glycolysis, glucose is used as an energy source and converted into pyruvate, producing ATP and NADH molecules. Lactic acid fermentation is an anerobic metabolic process carried out by few bacteria (Lactobacillus) and animal (i.e., muscle) cells.  Lactate dehydrogenase (enzyme) participates in this process and converts the pyruvate (produced during glycolysis) to lactic acid, thereby regenerating NAD+, which can be returned to the cycle and helps to maintain glycolysis. 

So, the correct option is 'O2O2 is used, CO2CO2 is not liberated'.
CO2

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

Ethyl alcohol fermentation can be observed in

  1. <p> Rhizopus</p>

  2. <p> Lactobacillus</p>

  3. Mesophyll cell

  4. RBC
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
While Saccharomyces cerevisiae is the most important source of industrial alcohol, R. stolonifer and other species of Rhizopus also produce ethyl alcohol which is the most important fermentation product.

So, the correct answer is 'Rhizopus'.
Multiple choice biology respiration in plants fermentation cell respiration living organisms and energy production
Ethyl alcohol fermentation occurs in _______________.

  1. Lactobacillus

  2. Muscles of Humans

  3. Rhizopus

  4. All of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Ethyl alcohol fermentation occurs in fungi such as Rhizopus, yeast, and bacteria. 

Lactobacillus and muscles of humans do anaerobic respiration but form lactic acid as an end product. (i.e., Lactic acid fermentation)
So, the correct answer is (C).

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

State whether the following statements are true or false.
When not enough oxygen gets to muscle cells during a sprint, energy is provided by glycolysis of glucose to pyruvic acid and then conversion of these molecules to lactic acid.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Glycolysis is the first part of both aerobic and anaerobic respiration.
  • The end product of glycolysis is pyruvic acid which is produced in the cytoplasm and no oxygen is required for the process of glycolysis.
  • The pyruvic acid formed can enter either kerb cycle for the reactions of aerobic respiration or it can undergo anaerobic reaction in the cells where there is absence of oxygen.
  • There are 2 process under anaerobic reaction in which pyruvic acid can take part. First is where pyruvic acid is converted to lactic acid and second is where it converted to Ethanol and carbon dioxide. These reaction are called fermentation reaction.
  • Fermentation reaction of pyruvic acid takes place when there is no presence of oxygen. Sometimes during some of the physical activities when not enough oxygen is not reaching the muscles the energy for the contraction and relaxation of the muscles is provided by the process of glycolysis (2ATP) and then the pyruvic acid undergoes fermentation reaction forming Lactic acid and releasing 1 molecule of NADH per Pyruvic acid molecule.
  • Therefore the above sentence is correct and the answer option 'True' is correct.