Respiration in Plants Test

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Respiration in Plants Test - 37

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Question 1
1 / -0

Which of the following enzyme is not used in Krebs cycle?

A
Aconitase

B
Decarboxylase

C
Aldolase

D
Fumarase

Solution

The enzyme fructose 1, 6-bisphosphate aldolase, often called aldolase, catalyzes a reversible aldol condensation reaction. Fructose 1, 6-bisphosphate is cleaved to yield two different triose phosphates, glyceraldehyde 3-phosphate, an aldose and dihydroxyacetone phosphate, a ketose. Aldolase is a glycolytic enzyme, rest of the enzymes catalyze some or the other reactions of the Krebs cycle.
Thus, the correct answer is option C.
Question 2
1 / -0

Citric acid is produced in

A
Bacterical episome

B
Krebs cycle

C
Calvin cycle

D
Calvin and HSK cycle

Solution

Krebs cycle is also called as the citric acid cycle because the first product of Krebs cycle is a tricarboxylic acid i.e., citric acid. In the first reaction of citric acid cycle, oxaloacetic acid reacts with acetyl CoA to generate citric acid. This reaction is catalyzed by enzyme citrate synthase.
Question 3
1 / -0

Where does formation of acetyl CoA from pyruvic acid take place?

A
Mitochondria

B
Chloroplast

C
Cytoplasm

D
Golgi body

Solution

Respiration process occurs in several stages. In the first stage, one molecule of (hexose) glucose is converted into two molecules of (three carbon atom containing) pyruvic acid. The process of glycolysis occurs in the cytoplasm without consumption of oxygen and no carbon dioxide is evolved. In the next stage which occurs in mitochondria, the pyruvic acid is oxidatively decarboxylated into acetyl coA and one molecule of carbon dioxide is released per molecule of pyruvic acid. The acetyl CoA then enters the Krebs cycle, which occurs in the mitochondrial matrix.
Question 4
1 / -0

R.Q. of a germinating ground nut and castor seed is

A
1.

B
< 1.

C
> 1.

D
0.

Solution

The respiratory quotient depends upon the type of respiratory substrate used during respiration. When fats are used in respiration, the RQ is less than 1. Groundnut and castor seeds are fats storing seeds, the stored fats are mobilised during their seed germination. Hence, the RQ value is less than one for germinating groundnut and castor seeds.
Question 5
1 / -0

The value of R.Q. of a succulent plant at night is

A
< 1.

B
> 1.

C
Zero.

D
Infinite.

Solution

In succulent plants at night the stomata are open and carbon dioxide is fixed into organic acids. Thus at night there is no net carbon dioxide evolved. Hence, value of RQ is zero.
Question 6
1 / -0

Of the following, the end product of fermentation is

A
$$O_{2}$$.

B
$$N_{2}O$$.

C
$$H_{2}O$$.

D
$$C_{2}H_{5}OH$$.

Solution

In fermentation, say by yeast, the incomplete oxidation of glucose is achieved under anaerobic conditions by sets of reactions where pyruvic acid is converted to CO$$_2$$ and ethanol. The enzymes, pyruvic acid decarboxylase and alcohol dehydrogenase catalyse these reactions. Other organisms like some bacteria produce lactic acid from pyruvic acid. In animal cells also, like muscles during exercise, when oxygen is inadequate for cellular respiration pyruvic acid is reduced to lactic acid by lactate dehydrogenase. The reducing agent is NADH+H+ which is reoxidised to NAD+ in both the processes.
Therefore, the correct answer is option D.
Question 7
1 / -0

The R.Q. value of a ripening fatty seed is

A
< 1.

B
> 1.

C
Zero.

D
Infinity.

Solution

During the ripening of oil-seeds, when fats are formed from carbohydrates the respiratory quotient is greater than 1. This arises because part of the oxygen consumed in respiration is derived from carbohydrates.
Question 8
1 / -0

Which of the following scientist discovered the conventional path of anaerobic glycolysis?

A
Embden, Meyerhof and Parnas

B
Emerson, Hoffman and Peterson

C
Embeden, Morrison and Pitcher

D
Warburg, Dickens and Horecker

Solution

The scheme of glycolysis was given by Gustav Embden, Otto Meyerhof, and J. Parnas, and is often referred to as the EMP pathway. In anaerobic organisms, it is the only process in respiration. Glycolysis occurs in the cytoplasm of the cell and is present in all living organisms. In this process, glucose undergoes partial oxidation to form two molecules of pyruvic acid. So, the correct answer is option A.
Question 9
1 / -0

Glycolysis gives rise to

A
8 ATP, 2 NADH$$_2$$, 2 Pyruvate.

B
2 ATP, 2 Co-A, 2 NADH$$_2$$.

C
2 ATP, 2 NADH$$_2$$, 2 Pyruvate.

D
2 ATP, 2 acetate, 2 NADPH$$_2$$.

Solution

In glycolysis, glucose undergoes partial oxidation to form two molecules of pyruvate or pyruvic acid and release 2 ATP and NADH$$_2$$ which undergoes oxidation-reduction to release energy.
So the correct option is '2 ATP, 2 NADH$$_2$$, 2 Pyruvate.'
Question 10
1 / -0

The enzyme which converts glucose to glucose-6-phosphate is

A
Phosphorylase

B
Glucose phosphorylase

C
Hexokinase

D
Phosphoglucomutase

Solution

Hexokinase catalyzes first reaction in the process of glycolysis. Glucose and fructose are phosphorylated to give rise to glucose-6-phosphate by the activity of the enzyme hexokinase. Hexokinase is a regulatory enzyme in the glycolysis pathway.

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Respiration in Plants Test - 37

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Respiration in Plants Test - 37

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SHARING IS CARING

Question 1

Aconitase

Decarboxylase

Aldolase

Fumarase

Solution

Question 2

Bacterical episome

Krebs cycle

Calvin cycle

Calvin and HSK cycle

Solution

Question 3

Mitochondria

Chloroplast

Cytoplasm

Golgi body

Solution

Question 4

1.

< 1.

> 1.

0.

Solution

Question 5

< 1.

> 1.

Zero.

Infinite.

Solution

Question 6

$$O_{2}$$.

$$N_{2}O$$.

$$H_{2}O$$.

$$C_{2}H_{5}OH$$.

Solution

Question 7

< 1.

> 1.

Zero.

Infinity.

Solution

Question 8

Embden, Meyerhof and Parnas

Emerson, Hoffman and Peterson

Embeden, Morrison and Pitcher

Warburg, Dickens and Horecker

Solution

Question 9

8 ATP, 2 NADH$$_2$$, 2 Pyruvate.

2 ATP, 2 Co-A, 2 NADH$$_2$$.

2 ATP, 2 NADH$$_2$$, 2 Pyruvate.

2 ATP, 2 acetate, 2 NADPH$$_2$$.

Solution

Question 10

Phosphorylase

Glucose phosphorylase

Hexokinase

Phosphoglucomutase

Solution

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