Respiration in Plants Test

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Respiration in Plants Test - 70

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Weekly Quiz Competition

Question 1
1 / -0

In the conversion of pyruvic acid to acetyl coenzyme A, pyruvic acid is:

A
Oxidized

B
Reduced

C
Isomerised

D
Inactivated

Solution

In Krebs cycle pyruvate enters mitochondria through a transport protein, here oxidative decarboxylation ( oxidation as well as removal of carbon dioxide ) occurs to produce co$$_2$$ which later combines with sulfur which has coenzyme A to form acetyl CoA.
So, the correct option is ' oxidized'.
Question 2
1 / -0

Choose the correct answers from the alternatives given :
The end product of alcoholic fermentation is:

A
ethanol or lactic acid

B
acetaldehyde

C
water and $$CO_2$$

D
pyruvic acid

Solution

Alcoholic fermentation is called as lactic acid fermentation, it is anaerobic respiration that does not require oxygen. It is the process of release of energy by incomplete degradation of organic food hence end products are never fully inorganic. First glycolysis occurs and forms two molecules of pyruvate after that fermentation occurs, no oxygen involved and later forms ethyl alcohol and lactic acid.
So, the correct option is ' ethanol or lactic acid'.
Question 3
1 / -0

Which process produces alcohol or lactate?

A
Krebs cycle

B
Glycolysis

C
Electron transport system

D
Fermentation
Solution
Respiration is of two types :
Aerobic respiration- here oxygen is required for the process to occur. It occurs in the following three steps :
Glycolysis
Krebs cycle
Terminal oxidation
Anaerobic respiration- here oxygen is not required in the process of respiration. In this process, organic food is incompletely degraded without the use of oxygen which later produces ethanol or lactic acid as the end product.
So, the correct option is ' Fermentation'.
Question 4
1 / -0

Choose the correct answers from the alternatives given :
Which one of the following is the link between glycolysis and Krebs cycle?

A
Acetyl coenzyme A

B
Phosphoenolpyutvic acid

C
Citric acid

D
Acetyl acetic acid

Solution

The link between glycolysis and Krebs cycle is called as link reaction where pyruvate is oxidized into acetyl CoA which is the main product of pyruvate dehydrogenase. This reaction requires five coenzymes and three enzymes.
So, the correct option is ' Acetyl coenzyme A'.
Question 5
1 / -0

Choose the correct answers from the alternatives given :
Which process must occur before fermentation?

A
Krebs cycle

B
Glycolysis

C
Electron transport system

D
The transition reaction

Solution

Fermentation is anaerobic respiration in which organic foods are degraded incompletely in the absence of oxygen.G glycolysis is the basic step of cellular respiration, it occurs in both aerobic as well as an anaerobic type of respiration. It is the common first step in both the type of respiration i.e; it must occur before the Krebs cycle as well as before fermentation.
So, the correct option is ' Glycolysis'.
Question 6
1 / -0

Choose the correct answers from the alternatives given :
The carbon dioxide we exhale is produced in

A
glycolysis

B
electron transport system

C
lactate fermentation

D
Krebs cycle

Solution

In aerobic respiration three processes occurs out of which two of the processes i.e ; glycolysis and electron transport system does not produce carbon dioxide while in Krebs cycle pyruvate is degraded into molecules of water and carbon dioxide which is obtained by the process of respiration in human beings and is exhaled by humans and animals and is taken up by the plants for the completion of cellular respiration .
So, the correct option is ' Krebs cycle'.
Question 7
1 / -0

The form in which carbon leaves the citric acid cycle is

A
Acetalehyde

B
Carbon dioxide

C
Ethanol

D
None of these
Solution
- Pyruvic acid is a 3 carbon molecule which is first oxidised to acetyl coA after reacting with coenzyme A. During this reaction one molecule of NADH and one molecule of Carbon dioxide is released.
- Second molecule of carbon dioxide along with a molecule of NADH is released when 6 carbon citric acid is converted to ketoglutaric acid .
- Third molecule of carbon dioxide is released during conversion of ketogluataric acid to succinic acid along with the release of NADH and GDP.
- Thus all three molcules of carbon present in the pyruvic acid are released in the form of carbon dioxide from the kerb cycle.
- Therefore the correct answer is option 'Carbon dioxide'.
Question 8
1 / -0

Choose the correct answers from the alternatives given :
Which of these pairs of processes are anaerobic?

A
Fermentation and glycolysis

B
Fermentation and the Krebs cycle

C
Glycolysis and the Krebs cycle

D
The Krebs cycle and the electron transport system
Solution
Respiration is of two types -
Aerobic respiration - It is the process of complete oxidation of organic foods into carbon dioxide and water in the presence of oxygen. it has three steps ;
Glycolysis - It occurs in the cytoplasm in which glucose breaks into two molecules of pyruvate. It occurs in both aerobic and anaerobic respiration.
Krebs cycle occurs in the mitochondria where oxidative decarboxylation of pyruvate takes place to form acetyl CoA.
Electron transport system - Here series of coenzymes and cytochromes acts as a passage of electron.
Anaerobic respiration - It is the process of incomplete oxidation of organic foods. oxygen is not utilized in this process, this occurs in the process of fermentation.
So, the correct option is ' Fermentation and glycolysis'.
Question 9
1 / -0

Choose the correct answers from the alternatives given :
In the last stage of aerobic respiration is the final acceptor of electrons that originally resided in glucose.

A
NADH

B
hydrogen

C
oxygen

D
water
Solution
Aerobic respiration is the complete oxidation of organic foods which has three steps :
Glycolysis - Glucose molecule is broken down into two molecules of pyruvate. Glucose is a sugar molecule that is made of CHO (Carbon, Hydrogen, Oxygen).
Krebs cycle is the middle of the initial and final stage of respiration.
Terminal oxidation - Electron transport system has a series of cytochromes and coenzymes that help in the transport of electrons. Cytochrome transport electron to oxygen which is the final acceptor of the electron. This oxygen is the one which constitutes the composition of glucose.
So, the correct option is ' oxygen'.
Question 10
1 / -0

Choose the correct answers from the alternatives given :
The citric acid cycle

A
must occur twice for each glucose molecule metabolised

B
produces 2 ATP directly from the cycle intermediates

C
produces 4 carbon dioxide molecules per glucose molecule

D
all of the above
Solution
- After glycolysis 2 molecules of 3 carbon pyruvate are formed from one molecule of Glucose.
- These pyruvate molecules then are converted to acetyl coA which enters the kerb cycle or the citric acid cycle
- After one acetyl coA molecule undergoes the cycle 4 molecules of NADH, one molecule of FADH and on molecule of ATP is formed.
- This is the number of the molecules formed from one pyruvate when it undergoes one cycle.
- Therefore one glucose molecule forms 2 pyruvates which means that at the end of the kerb cycle one glucose molecule will form 2 ATP
- Also for the formation of carbon dioxide; 2 molecules of carbon dioxide are formed, first one during the converstion of citric acid to ketoglutaric acid and second during the conversion of ketoglutaric acid to succinic acid. Whixh means that each pyruvic acid gives 2 molecules of carbon dioxide per cycle.
- Therefore one molecule of glucose will give 4 molecules of carbon dioxide as for a glucose molecule to be completed metabolised it has to undergo kerb cycle twice.
- Therefore the answer 'all of the above' is correct.

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Respiration in Plants Test - 70

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Respiration in Plants Test - 70

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SHARING IS CARING

Question 1

Oxidized

Reduced

Isomerised

Inactivated

Solution

Question 2

ethanol or lactic acid

acetaldehyde

water and $$CO_2$$

pyruvic acid

Solution

Question 3

Krebs cycle

Glycolysis

Electron transport system

Fermentation

Solution

Question 4

Acetyl coenzyme A

Phosphoenolpyutvic acid

Citric acid

Acetyl acetic acid

Solution

Question 5

Krebs cycle

Glycolysis

Electron transport system

The transition reaction

Solution

Question 6

glycolysis

electron transport system

lactate fermentation

Krebs cycle

Solution

Question 7

Acetalehyde

Carbon dioxide

Ethanol

None of these

Solution

Question 8

Fermentation and glycolysis

Fermentation and the Krebs cycle

Glycolysis and the Krebs cycle

The Krebs cycle and the electron transport system

Solution

Question 9

NADH

hydrogen

oxygen

water

Solution

Question 10

must occur twice for each glucose molecule metabolised

produces 2 ATP directly from the cycle intermediates

produces 4 carbon dioxide molecules per glucose molecule

all of the above

Solution

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