Respiration in Plants Test

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Respiration in Plants Test - 33

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Weekly Quiz Competition

Question 1
1 / -0

On complete oxidation in which one of the following substrates RQ will be more than one?

A
Carbohydrate

B
Fat

C
Organic acid

D
Protein

Solution

The respiratory quotient (RQ) is the ratio of $$CO_2$$ produced to $$O_2$$ consumed while food is being metabolized.
RQ = $$CO_2$$ eliminated/$$O_2$$ consumed.
The value of RQ is equal to 1 if carbohydrates are the respiratory substrates in aerobic respiration.
When the respiratory substrate is fat, the RQ is about 0.7.
When organic acids are broken down as respiratory substrates under aerobic conditions the RQ is more than one. Organic acids contain more oxygen than carbohydrates and therefore require less oxygen for their oxidation.
The value of R.Q for proteins is about 0.8.
Thus, option C is correct and other options are incorrect.
Question 2
1 / -0

Single turn of citric acid cycle yields

A
2 $${FADH_2}$$, 2$${NADH_2}$$, 2GTP

B
1 $${FADH_2}$$, 2$${NADH_2}$$, 1GTP

C
1 $${FADH_2}$$, 3$${NADH_2}$$, 1GTP

D
1 $${FADH_2}$$, 4$${NADH_2}$$, 1GTP

E
1 $${FADH_2}$$, 1$${NADH_2}$$, 2GTP

Solution

The citric acid cycle is a series of chemical reactions in the aerobic condition generates chemical energy through the oxidation of acetyl-CoA into carbon dioxide. Each turn of the cycle forms one GTP as well as three NADH2 molecules and one FADH2 molecule, which will be used in further steps of cellular respiration to produce ATP for the cell. Hence, option C is correct.
Question 3
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Number of ATP produced during EMP pathway is

A
24 ATP molecules

B
8 ATP molecules

C
38 ATP molecules

D
15 ATP molecules
Question 4
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Mitochondria supplies most of the necessary biological energy through

A
The breakdown of sugars

B
NADP reduction

C
Oxidation of TCA cycle products

D
The breakdown of proteins

Solution

Oxidation of TCA cycle products provide maximum energy during the respiration as it forms a total 30 ATP by the formation of NADPH, FADH$$_2$$ and GTP which are full of energy and provide it for biological processes.
So the correct option is 'Oxidation of TCA cycle products'.
Question 5
1 / -0

In succulent plants R.Q. is less than one because of

A
Complete oxidation

B
Complete reduction

C
Incomplete reduction

D
Incomplete oxidation

Solution

In succulent plants, the stomata are open during night and during this time plants absorb carbon dioxide. During day time stomata are closed and no carbon dioxide is evolved. These plants respire during night time, when they can take oxygen through open stomata. The volume of carbon dioxide is less than typical aerobic respiration. In fact during night time, these plants fix carbon dioxide into organic acids. The respiratory substrates are incompletely oxidised and thus, respiratory quotient is less than one.
Question 6
1 / -0

Which is the wrong statement from the following?

A
When tripalmitin is used as a substrate in respiration, the R.Q. is 0.7.

B
The intermediate compound which links glycolysis with Kreb's cycle is malic acid.

C
One glucose molecule yields a net gain of 36 ATP molecules during aerobic respiration.

D
One glucose molecule yields a net gain of 2 ATP molecules during fermentation.

E
The scheme of glycolysis was given by Embden, Meyerhof and Parnas.
Solution
Correct Answer: B
Explanation:
The respiratory quotient is less than one in aerobic respiration of fats like tripalmitin(0.7).
Kreb cycle is a step-wise cyclic but complete oxidation and decarboxylation of active acetate group to produce coenzymes and $$CO_2$$. Its substrate entrant or connecting link between glycolysis and Kreb cycles is Acetyl CoA.
During aerobic respiration, there is a net gain of 38 ATP molecules from the glucose but in most eukaryotes, 2 ATP is used for transporting NADH produced in glycolysis to mitochondria, net gain= 38-2=36 ATP.
In fermentation, the net gain of ATP from glucose is 2 ATP due to partial oxidation of glucose.
Glycolysis is also known as the Embden-Meyerhof-Parnas pathway (EMP) pathway because it is discovered by them.
Hence, the incorrect statement is The intermediate compound which links glycolysis with Kreb's cycle is malic acid.
Question 7
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The energy releasing metabolic process in which substrate is oxidized without an external electron acceptor is called as

A
Photorespiration

B
Glycolysis

C
Fermentation

D
Aerobic respiration

Solution

Fermentation is incomplete oxidation of food substances in absence of oxygen (external electron acceptor) into alcohol or lactic acid with the small amount of energy being released. Aerobic respiration uses oxygen as an electron acceptor for oxidation of substrates. Glycolysis is the first common stage of both fermentation and aerobic respiration. Photorespiration is oxidation of RuBP by enzyme RUBISCO and does not produce energy. Thus, the correct answer is option C.
Question 8
1 / -0

Where does TCA cycle take place?

A
Cytoplasm

B
Inner membrane of mitochondria

C
Outer membrane of mitochondria

D
Mitochondrial matrix
Solution
- Mitochondria are eukaryotic cell organelles. Mitochondria synthesize ATP through the process of aerobic respiration.
- Krebs cycle occurs in the mitochondrial matrix and oxidative phosphorylation is carried out with the help of electron carriers located in the inner mitochondrial membrane.
  Hence, option D is correct.
Question 9
1 / -0

During one Krebs cycle, the number of $${CO_2}$$ molecules released is

A
1

B
2

C
3

D
4

Solution

During Krebs cycle, two decarboxylation reactions take place. One during the conversion of oxalosuccinate to α-ketoglutarate and second when α-ketoglutarate changes to succinyl CoA.
Question 10
1 / -0

R.Q. is less than one at the time of respiration of

A
Starch

B
Sugarcane

C
Glucose

D
Groundnut

Solution

Respiratory quotient or R.Q is defined as the ratio of carbon dioxide evolved to oxygen taken in for respiratory break down of a substrate. The value of R.Q for oxidation of carbohydrates is unity and less than one for oxidation of fats and proteins. Thus if groundnut, which stores fats is used as respiratory substrate the value of R.Q will be less than one.

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Respiration in Plants Test - 33

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Respiration in Plants Test - 33

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Question 1

Carbohydrate

Fat

Organic acid

Protein

Solution

Question 2

2 $${FADH_2}$$, 2$${NADH_2}$$, 2GTP

1 $${FADH_2}$$, 2$${NADH_2}$$, 1GTP

1 $${FADH_2}$$, 3$${NADH_2}$$, 1GTP

1 $${FADH_2}$$, 4$${NADH_2}$$, 1GTP

1 $${FADH_2}$$, 1$${NADH_2}$$, 2GTP

Solution

Question 3

24 ATP molecules

8 ATP molecules

38 ATP molecules

15 ATP molecules

Question 4

The breakdown of sugars

NADP reduction

Oxidation of TCA cycle products

The breakdown of proteins

Solution

Question 5

Complete oxidation

Complete reduction

Incomplete reduction

Incomplete oxidation

Solution

Question 6

When tripalmitin is used as a substrate in respiration, the R.Q. is 0.7.

The intermediate compound which links glycolysis with Kreb's cycle is malic acid.

One glucose molecule yields a net gain of 36 ATP molecules during aerobic respiration.

One glucose molecule yields a net gain of 2 ATP molecules during fermentation.

The scheme of glycolysis was given by Embden, Meyerhof and Parnas.

Solution

Question 7

Photorespiration

Glycolysis

Fermentation

Aerobic respiration

Solution

Question 8

Cytoplasm

Inner membrane of mitochondria

Outer membrane of mitochondria

Mitochondrial matrix

Solution

Question 9

1

2

3

4

Solution

Question 10

Starch

Sugarcane

Glucose

Groundnut

Solution

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