Respiration in Plants Test

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Respiration in Plants Test - 17

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Question 1
1 / -0

If the volume of $$CO_{2}$$ liberated during respiration is more than the volume of $$O_{2}$$ used the respiratory substances will be

A
Fats

B
Organic acid

C
Proteins

D
Carbohydrate
Solution
- Organic acids have more volume of $$CO_2$$ liberated during respiration than the volume of $$O_2$$ used. Therefore, the RQ value will be greater than one. E.g., the RQ of oxalic acid is 4.
- RQ of fats and proteins is less than one while that of carbohydrates is one.
So, the correct answer is option B.
Question 2
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The R.Q of a plant organ depends upon the nature of the substrate which is

A
Reduced

B
Oxidized

C
Catabolized

D
Metabolized
Solution
- Respiration is an oxidative process in which respiratory substrates are oxidized to liberate energy inside the living cells.
- The respiratory quotient is the value, which depends upon the oxidation of the respiratory substrate.
- It is calculated by the amount of $$CO_2$$ eliminated to that of $$O_2$$ consumed.
- Different respiratory substrates have different numbers of carbon and oxygen atoms in their molecules.
- So, during respiration, the amount of carbon dioxide evolved from per gram weight of the substrate also differs.
So, the correct answer is option B.
Question 3
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R.Q. of fatty substances is generally

A
Unity

B
Less than one

C
Greater than one

D
Zero

Solution

Generally, fatty substances have R.Q. value less than one. It is because they have more oxygen consumed than $$CO_2$$ eliminated. For example, triolein produces 57 $$CO_2$$ molecules and takes 80 $$O_2$$ molecules in its oxidation.
Question 4
1 / -0

In Opuntia RQ is

A
One

B
Less than one

C
More than one

D
Zero
Solution
- When incomplete oxidation of carbohydrates takes place RQ is zero. In such cases, oxygen absorbed does not oxidize the carbohydrates completely to CO$$_2$$ and water but produces intermediate products of partial oxidation.
- This occurs especially in the respiration of succulent plants, such as cacti (Opuntia). In such plants respiration of carbohydrates occurs at night when stomata are open which results in the production of organic acids that utilize O$$_2$$ but do not evolve CO$$_2$$.
Thus, the correct answer is option D.
Question 5
1 / -0

The energy content in Kcal/g of carbohydrate : protein : triglycerol respectively is approximately in the ratio of

A
1 : 2 : 2

B
1 : 1 : 2

C
2 : 1 : 1

D
2 : 2 : 1

Solution

The energy content in Kcal/g of carbohydrate = 4. The energy content in Kcal/g of proteins = 4. The energy content in Kcal/g of triglyceride = 8.
The ratio is thus: 4 : 4 : 8 = 2 : 2 : 4 = 1 : 1 : 2.
So, the correct answer is option B.
Question 6
1 / -0

Pasteur's effect is

A
Stoppage of fermentation in the presence of oxygen

B
Increase of fermentation in the presence of oxygen

C
Decrease of fermentation in the presence of oxygen

D
No effect on fermentation

Solution

Pasteur effect is a stoppage effect of oxygen on the fermentation process. This is because oxygen inhibits anaerobic glycolysis. Alcoholic fermentation process could be arrested by passing oxygen through the fermenting fluid. Pasteur's effect confirms that certain organisms work in absence of oxygen and presence of oxygen can hinder their normal growth and working.
Thus, the correct answer is option A.
Question 7
1 / -0

R.Q (respiratory quotient) is defined as:

A
Volume of $$CO_{2}$$ evolved$$ = $$Volume of $$O_{2}$$ consumed

B
Volume of $$O_{2}$$ consumed/Volume of $$CO_{2}$$ evolved

C
Volume of $$CO_{2}$$ consumed/Volume of $$O_{2}$$ evolved

D
Volume of $$CO_{2}$$ evolved/Volume of $$O_{2}$$ consumed

Solution

Respiratory quotient is the ratio, which could be calculated by dividing the volume of $$CO_2$$ eliminated to that of the volume of $$O_2$$ consumed.
Question 8
1 / -0

Respiratory quotient of carbohydrate is

A
Unity

B
Greater than unity

C
Less than unity

D
Equal to five

Solution

Respiratory quotient of carohydrate will be always unity, because the volume of $$CO_2$$ eliminated is the same as the volume of $$O_2$$ consumed.
Question 9
1 / -0

R.Q. in anaerobic respiration is

A
0

B
$$\infty $$

C
1

D
> 1

Solution

In anaerobic respiration, there is no presence of oxygen. Thus, when the R.Q. is calculated, the denominator becomes '0' and the value of R.Q. turns infinity.
R.Q. = Volume of $$CO_2$$ eliminated / Volume of $$O_2$$ consumed.
$$C_{6}H_{12}O_{6}\rightarrow 2CO_{2}+2C_{2}H_{5}OH$$
$$R.Q=\frac{2}{0}=(infinite)$$
Question 10
1 / -0

Assertion : Aerobic respiration involves the exchange of respiratory gases twice in multicellular animals.
Reason : Exchange occurs from lung to heart and then heart to lung.

A
Both the assertion and the reason are true and the reason is a correct explanation of the assertion

B
Both the assertion and reason are true but the reason is not a correct explanation of the assertion

C
The assertion is true but the reason is false

D
Both the assertion and reason are false

E
The assertion is false but reason is true

Solution

Aerobic respiration involves the exchange of respiratory gases at two places in muticellular animals-one between the body surface and surrounding medium, the other between the individual cells and the extracellular fluid. Lungs are involved in the first step of exchange, but not the heart.
Hence the correct is answer option C.

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Re-Attempt Weekly Quiz Competition

Respiration in Plants Test - 17

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Respiration in Plants Test - 17

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SHARING IS CARING

Question 1

Fats

Organic acid

Proteins

Carbohydrate

Solution

Question 2

Reduced

Oxidized

Catabolized

Metabolized

Solution

Question 3

Unity

Less than one

Greater than one

Zero

Solution

Question 4

One

Less than one

More than one

Zero

Solution

Question 5

1 : 2 : 2

1 : 1 : 2

2 : 1 : 1

2 : 2 : 1

Solution

Question 6

Stoppage of fermentation in the presence of oxygen

Increase of fermentation in the presence of oxygen

Decrease of fermentation in the presence of oxygen

No effect on fermentation

Solution

Question 7

Volume of $$CO_{2}$$ evolved$$ = $$Volume of $$O_{2}$$ consumed

Volume of $$O_{2}$$ consumed/Volume of $$CO_{2}$$ evolved

Volume of $$CO_{2}$$ consumed/Volume of $$O_{2}$$ evolved

Volume of $$CO_{2}$$ evolved/Volume of $$O_{2}$$ consumed

Solution

Question 8

Unity

Greater than unity

Less than unity

Equal to five

Solution

Question 9

0

$$\infty $$

1

> 1

Solution

Question 10

Both the assertion and the reason are true and the reason is a correct explanation of the assertion

Both the assertion and reason are true but the reason is not a correct explanation of the assertion

The assertion is true but the reason is false

Both the assertion and reason are false

The assertion is false but reason is true

Solution

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