Tag: respiration in plants

Questions Related to respiration in plants

Anaerobic respiration is also known as

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  1. Intramolecular respiration.

  2. Intermolecular respiration.

  3. Extramolecular respiration.

  4. Molecular respiration.

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Correct Option: A
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. 

The experiment to show that $CO _{2}$ is given out during respiration, the type of respiration is

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

  1. anaerobic

  2. aerobic

  3. both (a) and (b)

  4. neither (a) and (b)

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Correct Option: C

Production of alcohol by yeast fermentation is 

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

  1. Anaerobic

  2. Aerobic

  3. Light dependent

  4. Both A and C

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Correct Option: A
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'.

Which of the following is widely accepted to respire in absence of oxygen?

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

  1. Yeast

  2. Potato

  3. Chlorella

  4. Grass

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Correct Option: A
Explanation:

Yeast can respire both aerobically as well as anaerobically. Under anaerobic conditions yeast carries out alcoholic fermentation. Thus, it yields carbon dioxide as a product after this process.

In respiratory process which step is not related with decarboxylation?

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

  1. Alcoholic fermentation

  2. TCA cycle

  3. Oxidative decarboxylation of Pyruvate

  4. Lactic acid fermentation

Show answer
Correct Option: D
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 '.

When milk changes into yoghurt ........... sugar converts into Acid?

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

  1. Maltose

  2. Lactose

  3. Sucrose

  4. Fructose

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Correct Option: B
Explanation:

Milk is rich in lactose sugar. When it is converted into yogurt, lactose sugar is converted to lactic acid by the action of Lactobacillus.

Hence, the correct answer is 'Lactose'.

Sometimes, higher plants and animals too perform anaerobic respiration.

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

  1. True

  2. False

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Correct Option: A
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.

In alcohol fermentation

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

  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

Show answer
Correct Option: A
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'

In anaerobic respiration of yeast

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

  1. ${ O } _{ 2 }$ is given out

  2. ${ CO } _{ 2 }$ is given out

  3. ${ CO } _{ 2 }$ is taken in

  4. ${ O } _{ 2 }$ is taken in

Show answer
Correct Option: B
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'.

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 %.

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

  1. 2

  2. 3

  3. 4

  4. 5

Show answer
Correct Option: A
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'.