Respiration in Plants Test

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Respiration in Plants Test - 78

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Question 1
1 / -0

Metabolic fate of pyruvic acid depend on

A
Cellular energy

B
Availability of oxygen

C
Type of respiration

D
All of the above

Solution

Pyruvic acid is formed by partial oxidation of glucose by the process of glycolysis.
A. The fate depends upon the cellular needs. There are three major ways by which pyruvic acid is handled by different cells, that are lactic acid fermentation, alcoholic fermentation and aerobic respiration.
B. In the availability of oxygen aerobic respiration takes places.
C. In the absence of oxygen alcoholic fermentation and lactic acid fermentation takes place and in presence of oxygen aerobic respiration takes place.
D. Therefore, all are correct.
So, the correct answer is 'All of the above'.
Question 2
1 / -0

How many molecules of ATP are require in glycolysis to change one molecule of glucose to pyruvic acid?

A
1

B
4

C
2

D
3

Solution

Glycolysis is a process in which glucose which is a six carbon compound, is converted into two molecules of pyruvate which is a three carbon compound. In the entire process of glycolysis, 4 ATP molecules are released and 2 ATP molecules are used up in the series of reactions. Hence, ATP molecules required to change one molecule of glucose to pyruvic acid are 2.
So, the correct answer is '2'.
Question 3
1 / -0

In aerobic respiration the Kreb's cycle occurs inside the

A
Chloroplast

B
Cytoplasm

C
Mitochondria

D
Ribosome

Solution

In eukaryotes, Krebs cycle, also known as Tricarboxylic acid cycle occurs in the matrix of the mitochondrion. Pyruvic acid, which is the end product of glycolysis enters Krebs cycle in the form of acetyl-coA and ultimately generates NADH, FADH2 and ATPs.
So, the correct answer is, 'Mitochondria'.
Question 4
1 / -0

The respiratory quotient during cellular respiration would depend upon

A
Amount of $$CO_{2}$$ released

B
Amount of $$O_{2}$$ utilized

C
The nature of enzyme in invoked

D
Nature of substrate

E
Both (a) and (b)

Solution

The respiratory quotient (R.Q) is the ration of the volume of the CO$$_{2}$$ released to the volume of the O$$_{2}$$ utilized by a substrate during the process of respiration. It solely depends on the nature of the substrate. The R.Q. reflect the nature of the substrate, for example, R.Q. 1 indicated that glucose is the respiratory substrate.
Hence, the correct answer is 'Nature of substrate'.
Question 5
1 / -0

Connecting link between respiration (TCA cycle) and protein synthesis is

A
Citric acid

B
$$\alpha$$- ketoglutaric acid

C
Succinic acid

D
Fumaric acid

Solution

The Tricarboxylic Acid (TCA) cycle, also known as the Kreb's cycle provides for the various intermediates that result in the formation of bio-molecules which are then used for other metabolic pathways. The oxaloacetate and the alpha-ketoglutarate are used in the synthesis of amino acids, and these amino-acids take part in protein synthesis.
A. Citric acid is used in the formation of fatty acids and sterols.
B. alpha-ketoglutaric acid is used in the synthesis of glutamate that forms the amino-acids.
C. Succinic acid is used in the formation of porphyrins.
D. Fumaric acid forms the malic acid which is then converted to the oxaloacetic acid. Oxaloacetic acid is used in the synthesis of amino acids.
Hence, the correct answer is 'alpha-ketoglutaric acid'
Question 6
1 / -0

Which or the following is the high energy molecule produced by oxidative decarboxylation in aerobic ,respiration but is neither the intermediate of TCA nor EMP?

A
$$NADH+H^+$$

B
$$ATP$$

C
Acetyl CoA

D
Succinyl CoA

Solution

The pyruvate is the end product of the EMP or the glycolysis. But it cannot take part in the Kreb's cycle directly. It has to undergo oxidative decarboxylation with the help of an enzyme-complex called pyruvate dehydrogenase to form acetaldehyde. Then, the coenzyme-A binds to the acetaldehyde to form the acetyl co-A. This two carbon molecule is rich in energy and it is not a part of EMP or glycolysis. Because it starts the process of Kreb's cycle by binding with the oxaloacetic acid, so it is not an intermediate of TCA or Kreb's cycle.
Hence, the correct answer is 'Acetyl CoA'
Question 7
1 / -0

Pyruvic acid $$\underset {dehydrogenase}{\xrightarrow {Pyruvate}} Acetyl\ CoA + CO_{2} + NaDH_{2}$$
In this given reaction which of the following coenzyme is not used?

A
$$Mg^{++}$$

B
$$NAD$$

C
$$Co-A$$

D
$$TPP$$

Solution

Pyuvrate dehydragenase is an enzyme that catalyse the reaction of pyruvate and a lipoamide to give the acetylated dihydrolipoamide and carbon dioxide. The conversion requires the coenzyme thiamine Pyrophasphate Whereas, $$Mg^{++}$$ plays a main role in body is to regulate the functions of enzymes which in turn are responsible for Various chemical reactions.
It plays an important role in the breakage of glucose and fat molecules in the regulation of cholestrol.
Question 8
1 / -0

FAD takes part in TCA cycle as electron acceptor during conversation of

A
Succinyl CoA to succinic acid

B
Fumaric acid to malic acid

C
$$\alpha$$ - Ketogluterate to succinyl CoA

D
Succinic acid to fumaric acid

Solution

Krebs's cycle is also called as TCA cycle. In this, succinic acid is converted into fumaric acid by enzyme succinate dehydrogenase. In this step, FAD acts as electron acceptor and is converted into FADH$$_2$$.
Thus, the correct answer is 'Succinic acid to fumaric acid.'
Question 9
1 / -0

Which of the following is incorrect about fermentation?

A
Toddy is made by fermenting sap from palms.

B
Propionibacterium is used to ferment the cheese.

C
The puffed-up appearance of dough is due to the production of $${ CO }_{ 2 }$$.

D
Fermentation in muscles produces alcohol.

Solution

A. Toddy is created by fermenting the saps of various species of palm trees such as the palmyra, date palms, and coconut palms.
B. Swiss cheese is obtained by propionic fermentation which occurs due to the propionibacteria.
C. The yeast added to flour reproduces rapidly and produces carbon dioxide gas which gives a puffed-up appearance.
D. Fermentation in muscle cells produces a waste product called lactic acid which contributes to fatigue in muscles.

So, the correct answer is option D.
Question 10
1 / -0

If one molecule of acetyl-CoA oxidized inside eukaryotic cell then gain of energy is equal to

A
$$12 ATP$$

B
$$9 ATP$$

C
$$18 ATP$$

D
$$15 ATP$$

Solution

Acetyl-CoA enters Krebs cycle to undergo oxidation. Three NADH, one GTP and one FADH$$_{2}$$ are produced during Krebs cycle. One NADH is equivalent to three ATP while one FADH$$_{2}$$ is equivalent to two ATP.
Hence total ATP produced are -
3*3 + 2 + 1 + 12

So, the correct option is '12 ATP'.

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Respiration in Plants Test - 78

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Respiration in Plants Test - 78

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SHARING IS CARING

Question 1

Cellular energy

Availability of oxygen

Type of respiration

All of the above

Solution

Question 2

1

4

2

3

Solution

Question 3

Chloroplast

Cytoplasm

Mitochondria

Ribosome

Solution

Question 4

Amount of $$CO_{2}$$ released

Amount of $$O_{2}$$ utilized

The nature of enzyme in invoked

Nature of substrate

Both (a) and (b)

Solution

Question 5

Citric acid

$$\alpha$$- ketoglutaric acid

Succinic acid

Fumaric acid

Solution

Question 6

$$NADH+H^+$$

$$ATP$$

Acetyl CoA

Succinyl CoA

Solution

Question 7

$$Mg^{++}$$

$$NAD$$

$$Co-A$$

$$TPP$$

Solution

Question 8

Succinyl CoA to succinic acid

Fumaric acid to malic acid

$$\alpha$$ - Ketogluterate to succinyl CoA

Succinic acid to fumaric acid

Solution

Question 9

Toddy is made by fermenting sap from palms.

Propionibacterium is used to ferment the cheese.

The puffed-up appearance of dough is due to the production of $${ CO }_{ 2 }$$.

Fermentation in muscles produces alcohol.

Solution

Question 10

$$12 ATP$$

$$9 ATP$$

$$18 ATP$$

$$15 ATP$$

Solution

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