Tag: respiration in plants

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Questions Related to respiration in plants

Multiple choice biology respiration in plants do plants breathe? plant respiration respiration-plants

Anaerobic respiration is also known as

  1. Intramolecular respiration.

  2. Intermolecular respiration.

  3. Extramolecular respiration.

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

Anaerobic respiration is a process of formation of energy in the absence of oxygen. Fermentation is a form of anaerobic respiration and called as intramolecular respiration. Intramolecular respiration is characteristic of certain tissues (the meristem, the fleshy parts of fruits, tubers). Chemically, the intramolecular respiration of green plants is closely related to alcoholic fermentation. 

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

Production of alcohol by yeast fermentation is 

  1. Anaerobic

  2. Aerobic

  3. Light dependent

  4. Both A and C
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Yeast fermentation is a type of anaerobic respiration in which the substrate is oxidised in absence of oxygen. The intermediate product is acetaldehyde and final products are ethyl alcohol and CO$ _2$. It is also known as alcoholic fermentation. So the answer is 'Anaerobic'.

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

In respiratory process which step is not related with decarboxylation?

  1. Alcoholic fermentation

  2. TCA cycle

  3. Oxidative decarboxylation of Pyruvate

  4. Lactic acid fermentation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
 Name of process   Decarboxylation occurence
 Alcoholic fermentation  Pyruvate (3C) $\rightarrow$  Acetaldehyde (2C)
 TCA cycle  Isocitrate$\rightarrow$ $\alpha$ ketoglutarate
 Oxidative decarboxylation Pyruvate $\rightarrow$ Acetyl CoA
 Lactic acid fermentation  No decarboxylation process occurs

So, the correct answer is ' Lactic acid fermentation '.

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

Sometimes, higher plants and animals too perform anaerobic respiration.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

(i). Respiration is an energy yielding process and takes place by the oxidation of foodstuffs.
(ii) Higher plants and animals require oxygen in order to respire aerobically.
(iii) However, in conditions where oxygen is depleted, these organisms perform anaerobic respiration to obtain energy.

(iv). Glucose is incompletely oxidized and a comparatively lesser amount of energy is obtained through anaerobic respiration. The anaerobic respiration mainly takes place during strenuous exercise when there is shortage of oxygen, which leads to production of lactic acid in muscles.

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

In alcohol fermentation

  1. Triose phosphate is the electron donor while acetaldehyde is the electron acceptor

  2. Triose phosphate is the electron donor while pyruvic acid is the electron acceptor

  3. There is no electron donor

  4. Oxygen is the electron acceptor
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In alcohol fermentation, the pyruvic acid (triose phosphate) produced through glycolysis is subjected to the oxidative decarboxylation, wherein the pyruvic acid is converted to the acetaldehyde. The acetaldehyde accepts the electrons and is reduced to form the alcohol or ethanol. There is no external electron acceptor involved as in case of aerobic respiration

So, the correct answer is 'triose phosphate is the electron donor while the acetaldehyde is the electron acceptor'

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

In anaerobic respiration of yeast

  1. ${ O } _{ 2 }$ is given out
  2. ${ CO } _{ 2 }$ is given out
  3. ${ CO } _{ 2 }$ is taken in
  4. ${ O } _{ 2 }$ is taken in
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Yeast respires anaerobically (in the absence of oxygen) . The process is known as fermentation. Glucose is the respiratory substrate.

The glucose is converted to pyruvate by the process of glycolysis. This process is independent of oxygen. If oxygen is absent, the pyruvate is broken by yeast into ethanol releasing carbon dioxide along with the production of 2 ATP.
So, the correct answer is 'CO$ _2$ is given out'.

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

Select the number of incorrect statements for the process of fermentation.
A . It involves only partial breakdown of glucose.
B $NADH _2$ is oxidized to NAD by reduction of organic compound.
C. No ATP are produced during fermentation as it is extracellular process in some microbes.
D. There is no ETS and Kreb's cycle.
E. Maximum concentration of alcohol in alcohol in alcoholic brevarage is 100 %.

  1. 2

  2. 3

  3. 4

  4. 5
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Fermentation can be defined as the partial breakdown of glucose to produce ethyl alcohol and carbon dioxide.
  • It releases energy in form of  ATP molecules.
  • 2 ATP molecules are produced per glucose.
  • 2NADH molecules provide energy which converts pyruvate into lactic acid.
  • The maximum concentration of alcohol in alcoholic beverages is 15%-16%.
  • Option C and E are incorrect statements.
  • So, the correct answer is'2'.