Respiration in Plants Test

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Respiration in Plants Test - 54

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Weekly Quiz Competition

Question 1
1 / -0

Buchner was successful in extracting a respiratory enzyme complex

A
ATP

B
NADH

C
Zymase

D
Mitochondria

Solution

Eduard Buchner was a German chemist who won the Noble prize in chemistry for his chance discovery in 1907. His brother Hans Buchner was a physician who conducted early research on blood proteins that could destroy bacteria. Eduard Buchner assisted his brother in his research. He produced yeast cell-free extracts for his brother who wanted to use them for immunological applications. In order to preserve the protein extract from yeast cells, he added sugar and while doing this he noticed the formation of bubbles. This meant that carbon dioxide and alcohol were being produced. Buchner had obtained an enzyme mixture called zymase from yeast that caused glycolysis and transformed the sugar into alcohol. Thus he discovered zymase, a complex of the enzyme that caused glycolysis in 1903.
Thus, the correct answer is option C.
Question 2
1 / -0

The enzyme which converts glucose to glucose 6-phosphate is

A
Phosphorylase

B
Glucose-6-phosphatase

C
Hexokinase

D
Glucose synthetase

Solution

During the process of Glycolysis, an organic substrate like glucose is reduced to pyruvic acid with the production of ATP and NADH$$_2$$. The first step of Glycolysis involves phosphorylation of glucose to glucose-6-phosphate. The enzyme hexokinase phosphorylates glucose with a phosphate from ATP along with Mg2+ as a cofactor.
So the correct answer is 'Hexokinase'.
Question 3
1 / -0

The reactions of Kreb's/citric acid cycle take place

A
In the cytoplasm

B
In ER

C
In matrix of mitochondria

D
On the surface of mitochondria.

Solution

Krebs cycle is an important reaction during the aerobic respiration because here generation of ATP and energy takes place. This cycle takes place in the matrix of mitochondria because an important enzymes succinate dehydrogenase which is important during the Krebs cycle is present only in the matrix of the mitochondria.
So, the correct option is 'In the matrix of Mitochondria'
Question 4
1 / -0

Krebs cycle starts with the formation of six carbon compound by reaction between

A
Malic acid and acetyl CoA

B
Succinic acid and pyruvic acid

C
Fumaric acid and pyruvic acid

D
Oxalo-acetic acid and acetyl CoA

Solution

Glycolysis results in the formation of two carbon compound which is known as the acetyl coenzyme a.
This acetyl coenzyme a when reacts with acetic acid in the Krebs cycle it forms a 6 carbon compound which is known as the citric acid.
Citric acid is the main component of the Krebs cycle and therefore the cycle is also known as the citric acid cycle.
So, the correct option is 'Oxalo-acetic acid and acetyl coenzyme A'
Question 5
1 / -0

In the process of respiration in plants 180g of glucose plus 192 g of oxygen produce ___________________.

A
132 g of $$CO_2$$, 54 g of water and 343 Cal. of energy

B
264 g of $$CO_2$$, 108 g of water and 686 Cal. of energy

C
528 g of $$CO_2$$, 216 g of water and 1372 Cal. of energy

D
Large amount of $$CO_2$$, no water and no energy

Solution

Molecular weight of glucose is 180, 6 molecules of oxygen are 192, 6 molecules of $$CO_2$$ are 264 while molecules of water are 108. Calories with capital C(cal) is kcal.
Question 6
1 / -0

Fermentation is

A
Anaerobic respiration

B
Incomplete oxidation of carbohydrates

C
Complete oxidation of carbohydrates

D
None of the above

Solution

Fermentation is a type of anaerobic respiration in which the breakdown of glucose takes place to release acids, alcohols and other gases in absence of oxygen. It takes place in the cytoplasm.
It involves glycolysis which is the breakdown of glucose to form pyruvic acid which can undergo two different pathways to form the lactic acid or ethanol and carbon dioxide.
So, the correct option is 'Anaerobic respiration'
Question 7
1 / -0

Link between glycolysis, Krebs cycle and $$\beta$$-oxidation of fatty acid or carbohydrate and fat metabolism is

A
Oxaloacetic acid

B
Succinic acid

C
Citric acid

D
Acetyl CoA

Solution

After glycolysis, the pyruvic acid is converted into acetyl CoA by a reaction which is known as the link reaction with links the glycolysis and Krebs cycle Fats are broken down by beta-oxidation and then they also form acetyl CoA which is directly entered into crab cycle.
So, the correct option is 'Acetyl CoA.'
Question 8
1 / -0

In glycolysis, the end product is

A
Protein is converted into glucose

B
Glucose is converted into glycogen

C
Starch is converted into glucose

D
Glucose is converted into pyruvic acid

Solution

Glycolysis is a multi-step process by which one molecule of glucose breakdown into a molecule of pyruvic acid. Glucose is a six-carbon sugar and pyruvic acid is a three-carbon molecule. This is a common pathway in aerobic and anaerobic respiration and it takes place in the cytoplasm.
So, the correct option is 'Glucose is converted into pyruvic acid'
Question 9
1 / -0

In succulents, respiratory quotient is less than one due to

A
Incomplete oxidation

B
Incomplete reduction

C
Complete reduction

D
Complete oxidation

Solution

Where incomplete oxidation of carbohydrates takes place R.Q is zero. In such cases oxygen absorbed does not oxidise the carbohydrates completely to carbon dioxide and water.
This occurs especially in respiration of succulent plants. In such plants respiration of carbohydrates occurs at night when stomata are open which results in the production of organic acids that utilise O₂ but do not evolve CO₂.
So, the correct option is 'Incomplete oxidation'
Question 10
1 / -0

Which is key intermediate compound linking glycolysis to Krebs cycle?

A
Malic acid

B
Acetyl CoA

C
NADH

D
ATP

Solution

Acetyl CoA is the key intermediate between the Krebs cycle of glycolysis. After glycolysis, the glucose converts to pyruvic acid which is a three-carbon molecule. It is converted into acetyl coenzyme a by oxidative decarboxylation This, Acetyl CoA enters the Krebs cycle and along with oxaloacetic acid forms the citric acid which is a 6C compound.
So, the correct option is 'Acetyl CoA.'

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Respiration in Plants Test - 54

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Respiration in Plants Test - 54

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SHARING IS CARING

Question 1

ATP

NADH

Zymase

Mitochondria

Solution

Question 2

Phosphorylase

Glucose-6-phosphatase

Hexokinase

Glucose synthetase

Solution

Question 3

In the cytoplasm

In ER

In matrix of mitochondria

On the surface of mitochondria.

Solution

Question 4

Malic acid and acetyl CoA

Succinic acid and pyruvic acid

Fumaric acid and pyruvic acid

Oxalo-acetic acid and acetyl CoA

Solution

Question 5

132 g of $$CO_2$$, 54 g of water and 343 Cal. of energy

264 g of $$CO_2$$, 108 g of water and 686 Cal. of energy

528 g of $$CO_2$$, 216 g of water and 1372 Cal. of energy

Large amount of $$CO_2$$, no water and no energy

Solution

Question 6

Anaerobic respiration

Incomplete oxidation of carbohydrates

Complete oxidation of carbohydrates

None of the above

Solution

Question 7

Oxaloacetic acid

Succinic acid

Citric acid

Acetyl CoA

Solution

Question 8

Protein is converted into glucose

Glucose is converted into glycogen

Starch is converted into glucose

Glucose is converted into pyruvic acid

Solution

Question 9

Incomplete oxidation

Incomplete reduction

Complete reduction

Complete oxidation

Solution

Question 10

Malic acid

Acetyl CoA

NADH

ATP

Solution

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