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NEET • BIOLOGY • RESPIRATION IN PLANTS

Respiration in plants practice · Easy

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Showing 1-30 of 72 questions

1 Easy

1 of 72

Remembering +4 | -1

The released energy obtained by oxidation is stored as

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Correct option: C

ATP

Option C (ATP) is correct because ATP (adenosine triphosphate) is the primary energy currency of the cell, storing energy released during oxidation.

2 Easy

2 of 72

Understanding +4 | -1

Respiration in plants is different from animals as

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Correct option: C

Every plant part takes care of its own gas exchange needs

Option C (Every plant part takes care of its own gas exchange needs) is correct because plants do not have a centralized respiratory system like animals; each part independently exchanges gases with the environment.

3 Easy

3 of 72

Understanding +4 | -1

Plants does not need specialised respiratory organ because

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Correct option: C

Both (a) and (b)

Option C (Both (a) and (b)) is correct because plants have a lower metabolic rate and each part can handle its own gas exchange, reducing the need for specialized respiratory organs.

4 Easy

4 of 72

Understanding +4 | -1

Assertion: The breakdown of glucose to pyruvic acid is
called glycolysis
Reason: For complete oxidation of glucose organism adopt
Kreb’s cycle

View answer and explanation

Correct option: B

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

Option B (If both the assertion and reason are true but the reason is not a correct explanation of the assertion) is correct because both statements are true, but Krebs cycle is not the reason why glucose breaks down to pyruvic acid.

5 Easy

5 of 72

Understanding +4 | -1

During starvation, RQ value will be

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Correct option: B

less than unity

Option B is correct because during starvation, the body primarily utilizes fats and proteins as respiratory substrates, which have RQ values less than unity.

6 Easy

6 of 72

Understanding +4 | -1

The intermediate compound common for aerobic and anaerobic respiration is

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Correct option: B

Pyruvic acid

The correct answer is B (Pyruvic acid) because pyruvic acid is the end product of glycolysis, which is a common pathway for both aerobic and anaerobic respiration.

7 Easy

7 of 72

Remembering +4 | -1

Energy currency of the cell is?

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Correct option: B

ATP

Option B (ATP) is correct because ATP (Adenosine Triphosphate) is the primary energy currency used by cells for various metabolic processes.

8 Easy

8 of 72

Remembering +4 | -1

In respiration breaking down of glucose with oxygen is known as

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Correct option: A

Oxidation process

Option A is correct because respiration involves the breaking down of glucose with oxygen, which is an oxidation process.

9 Easy

9 of 72

Remembering +4 | -1

Ultimate source of energy in biosphere, is

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Correct option: A

Sunlight

Option A (Sunlight) is correct because sunlight is the ultimate source of energy for almost all life on Earth, driving photosynthesis.

10 Easy

10 of 72

Understanding +4 | -1

Conversion of 3-PGA to 2-PGA in glycolysis is an example for?

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Correct option: B

Intramolecular shift

Option B (Intramolecular shift) is correct because the conversion of 3-PGA to 2-PGA involves moving the phosphate group within the same molecule.

11 Easy

11 of 72

Understanding +4 | -1

Which one of the following is not included in glycolysis?

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Correct option: B

The end products are

C{{O}_{2}}

and

{{H}_{2}}O.

Option B (The end products are

C{{O}_{2}}

and

{{H}_{2}}O.

) is correct because

C{{O}_{2}}

and

{{H}_{2}}O

are the end products of aerobic respiration (Krebs cycle and ETC), not glycolysis. Glycolysis ends with pyruvate.

12 Easy

12 of 72

Understanding +4 | -1

Aerobic respiration is

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Correct option: B

The process in which complete oxidation of organic substances in the presence of oxygen

The correct answer is B (The process in which complete oxidation of organic substances in the presence of oxygen) because aerobic respiration requires oxygen to completely oxidize organic molecules, yielding a large amount of ATP.

13 Easy

13 of 72

Remembering +4 | -1

RQ value in Tripalmitin is?

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Correct option: A

0.7

Option A (

0.7

) is correct because the respiratory quotient (RQ) for tripalmitin, a fat, is approximately 0.7.

14 Easy

14 of 72

Understanding +4 | -1

The respiratory quotient of which of the following substrate is less than one ?

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Correct option: A

Proteins

Option A (Proteins) is correct because proteins generally have a respiratory quotient (RQ) less than one.

15 Easy

15 of 72

Understanding +4 | -1

Choose the correct statement for the given options

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Correct option: A

Intermediates in the pathway are utilised to synthesise other compounds

The correct answer is A (Intermediates in the pathway are utilised to synthesise other compounds) because metabolic pathways are interconnected, and intermediates can be used for synthesizing other biomolecules.

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16 Easy

16 of 72

Analyzing +4 | -1

Assertion (A) Carbohydrates are used first by most cells in
respiration.
Reason (R) Lipids are never used in respiration

View answer and explanation

Correct option: C

If A is true, but R is false

Option C (If A is true, but R is false) is correct because carbohydrates are often the preferred initial substrate, but lipids can also be used in respiration.

17 Easy

17 of 72

Remembering +4 | -1

In anaerobic respiration the correct sequence of catabolism of glucose is

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Correct option: B

Glycolysis, fermentation

Option B (Glycolysis, fermentation) is correct because anaerobic respiration consists of glycolysis followed by fermentation to regenerate NAD+.

18 Easy

18 of 72

Understanding +4 | -1

An ATP molecule is structurally most similar to a molecule of

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Correct option: A

RNA nucleotide

The correct answer is A (RNA nucleotide) because ATP is an adenosine nucleotide with three phosphate groups, making it structurally similar to an RNA nucleotide (adenosine monophosphate).

19 Easy

19 of 72

Analyzing +4 | -1

All of the following differentiate aerobic respiration and alcoholic fermentation, except

View answer and explanation

Correct option: B

Evolution of

CO_2

Option B (Evolution of

CO_2

) is correct because both aerobic respiration and alcoholic fermentation produce

CO_2

as a byproduct.

20 Easy

20 of 72

Understanding +4 | -1

Assertion: Glucose is a respiratory substrate
Reason: Glucose is oxidised during process of cellular
respiration

View answer and explanation

Correct option: A

If both the assertion and the reason are true and the
reason is a correct explanation of the
assertion

Option A (If both the assertion and the reason are true and the reason is a correct explanation of the assertion) is correct because glucose is indeed a respiratory substrate, and it is oxidized during cellular respiration to release energy.

21 Easy

21 of 72

Understanding +4 | -1

If RQ is less than 1.0 in a respiratory metabolism, it would mean that

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Correct option: C

The oxidation of the respiratory substrate consumed more oxygen than the amount of

C{O_2}

released

Option C is correct because RQ less than 1 indicates that more oxygen is consumed relative to the carbon dioxide released during the oxidation of the respiratory substrate.

22 Easy

22 of 72

Understanding +4 | -1

RQ value in succulent xerophytes

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Correct option: D

zero

Option D is correct because succulent xerophytes like Opuntia fix carbon dioxide at night and have minimal respiration, resulting in an RQ value close to zero.

23 Easy

23 of 72

Understanding +4 | -1

Glycolysis is

View answer and explanation

Correct option: A

Oxidative process

Option A (Oxidative process) is correct because Glycolysis involves the oxidation of glucose to pyruvate, with the reduction of NAD+ to NADH.

24 Easy

24 of 72

Remembering +4 | -1

For gaseous exchange plants have

View answer and explanation

Correct option: D

Both (a) and (b)

Option D (Both (a) and (b)) is correct because plants use both stomata (in leaves) and lenticels (in stems) for gaseous exchange (CO2 intake and O2 release).

25 Easy

25 of 72

Remembering +4 | -1

The number of ATP produced when a molecule of glucose undergoes fermentation

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Correct option: C

Option C (2) is correct because fermentation yields a net gain of only 2 ATP molecules per glucose molecule.

26 Easy

26 of 72

Understanding +4 | -1

The ratio of carbons found in lactic acid and ethanol respectively

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Correct option: D

3:2

Option D (

3:2

) is correct because lactic acid has 3 carbons (C3H6O3) and ethanol has 2 carbons (C2H5OH), so the ratio is 3:2.

27 Easy

27 of 72

Remembering +4 | -1

In anaerobic respiration bacteria produce

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Correct option: A

Lactic acid

Option A (Lactic acid) is correct because lactic acid fermentation is a common type of anaerobic respiration carried out by bacteria.

28 Easy

28 of 72

Remembering +4 | -1

Cell respiration is carried out by

View answer and explanation

Correct option: B

Mitochondria

Option B (Mitochondria) is correct because cellular respiration, the process of generating energy (ATP) from glucose, primarily occurs in the mitochondria.

29 Easy

29 of 72

Remembering +4 | -1

Incomplete breakdown of sugar in anaerobic respiration forms

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Correct option: B

Alcohol and carbon dioxide

Option B (Alcohol and carbon dioxide) is correct because anaerobic respiration of sugar results in the formation of alcohol and carbon dioxide.

30 Easy

30 of 72

Remembering +4 | -1

In electron transport system, which of the following acts as a final hydrogen acceptor

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Correct option: A

Oxygen

Option A (Oxygen) is correct because oxygen acts as the final electron acceptor in the electron transport system, forming water.

Revision notes and key takeaways

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Key Takeaways

✓ This set contains 72 single-correct-answer MCQs on RESPIRATION IN PLANTS.
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