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NEET • BIOLOGY • RESPIRATION IN PLANTS

Respiration in plants practice · Hard

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Showing 1-30 of 40 questions
1 Hard
1 of 40
Application +4 | -1
Upon oxidation of 1 molecule of pyruvic acid in mitochondrial respiration the molecules of ATP generated are?
View answer and explanation
Correct option: D
15
Option D (15) is correct because the complete oxidation of one molecule of pyruvic acid yields 15 ATP molecules through the Krebs cycle and electron transport chain.
2 Hard
2 of 40
Remembering +4 | -1
The first formed substance in Kreb’s cycle is
View answer and explanation
Correct option: B
Citric acid
The correct answer is B (Citric acid) because citric acid is the first stable compound formed in the Krebs cycle, resulting from the condensation of acetyl-CoA and oxaloacetate.
3 Hard
3 of 40
Understanding +4 | -1
Assertion (A): During oxidation of respiratory substrate energy does not release in a single step.

Reason (R): Breakdown of respiratory substrate in single step leads to unfavourable changes in cell temperature.
View answer and explanation
Correct option: A
Both (A) & (R) are true and the (R) is the correct explanation of the (A)
Option A (Both (A) & (R) are true and the (R) is the correct explanation of the (A)) is correct because the energy release in respiration is indeed stepwise to prevent damaging temperature changes.
4 Hard
4 of 40
Understanding +4 | -1
Assertion (A): It is better to consider the respiratory pathway as an amphibolic pathway rather than only as a catabolic one.

Reason (R): Breaking down processes within the living organism is catabolism, and synthesis is anabolism.
View answer and explanation
Correct option: B
Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
Option B (Both (A) & (R) are true but the (R) is not the correct explanation of the (A)) is correct because while both the assertion and reason are true, the reason doesn't fully explain why the respiratory pathway is considered amphibolic.
5 Hard
5 of 40
Remembering +4 | -1
ETS present in the?
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Correct option: A
Inner mitochondrial membrane
The correct answer is A (Inner mitochondrial membrane) because the electron transport system (ETS) is embedded in the inner mitochondrial membrane.
6 Hard
6 of 40
Understanding +4 | -1
RQ value is an infinity during?
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Correct option: D
Anaerobic respiration of carbohydrates as substrate
Option D is correct because during anaerobic respiration of carbohydrates, oxygen is not consumed, but carbon dioxide is produced, making the RQ value infinite.
7 Hard
7 of 40
Understanding +4 | -1
If fatty acids to be respired, they would first be degraded to
View answer and explanation
Correct option: C
Acetyl Co. A
Option C (Acetyl Co. A) is correct because fatty acids are broken down into Acetyl Co. A through beta-oxidation before entering the Krebs cycle.
8 Hard
8 of 40
Understanding +4 | -1
Glycolysis
View answer and explanation
Correct option: D
Is the only process of respiration in anaerobic organism
Option D (Is the only process of respiration in anaerobic organism) is correct because glycolysis is the sole ATP-producing pathway in many anaerobic organisms.
9 Hard
9 of 40
Understanding +4 | -1
Both respiration and photosynthesis require the following?
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Correct option: D
Cytochromes
Option D (Cytochromes) is correct because cytochromes are essential components of the electron transport chain in both respiration and photosynthesis.
10 Hard
10 of 40
Remembering +4 | -1
R.Q of malic acid
View answer and explanation
Correct option: C
1.331.33
Option C (1.331.33) is correct because the respiratory quotient (RQ) of malic acid is 1.33.
11 Hard
11 of 40
Remembering +4 | -1
EMP can produce a total of how many ATP under aerobic condition
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Correct option: B
10
Option B (10) is correct because EMP (Embden-Meyerhof-Parnas) pathway, or glycolysis, produces a net of 2 ATP and 2 NADH. Each NADH yields 3 ATP in aerobic conditions, totaling 10 ATP.
12 Hard
12 of 40
Remembering +4 | -1
The enzymes for TCA cycle are present in
View answer and explanation
Correct option: C
Mitochondria
The correct answer is C (Mitochondria) because the enzymes of the TCA cycle (Krebs cycle) are located in the mitochondrial matrix.
13 Hard
13 of 40
Understanding +4 | -1
Assertion (A): During fermentation oxidation of NADH to NAD+\text{NAD}^+ is comparatively slow process than aerobic respiration.

Reason (R): NADH arise during fermentation do not enter in ETC, it is to reduce the pyruvate or aldehyde.
View answer and explanation
Correct option: A
Both (A) & (R) are true and the (R) is the correct explanation of the (A)
Option A is correct because during fermentation, the oxidation of NADH to NAD+ is slower than in aerobic respiration, and the NADH produced does not enter the ETC but reduces pyruvate or acetaldehyde.
14 Hard
14 of 40
Understanding +4 | -1
Fats enters into Amphibolic pathway, need to be broken down into?
View answer and explanation
Correct option: C
1 and 2
Option C (1 and 2) is correct because fats must be broken down into glycerol and fatty acids before entering the amphibolic pathway.
15 Hard
15 of 40
Remembering +4 | -1
Which one is correct sequence in glycolysis?
View answer and explanation
Correct option: B
G−6−P→3PGAL→3PGA→PEPG - 6 - P \to 3PGAL \to 3PGA \to PEP
Option B is correct because the correct sequence is G−6−P→3PGAL→3PGA→PEPG - 6 - P \to 3PGAL \to 3PGA \to PEP. This represents a portion of the glycolytic pathway.

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ANIMAL KINGDOM 756 MCQs PLANT KINGDOM 415 MCQs ANATOMY OF FLOWERING PLANTS 404 MCQs MOLECULAR BASIS OF INHERITANCE 404 MCQs CHEMICAL COORDINATION AND INTEGRATION 387 MCQs PRINCIPLE OF INHERITANCE AND VARIATION 374 MCQs
16 Hard
16 of 40
Understanding +4 | -1
Assertion (A): Water molecules appear on both sides of the equation of photosynthesis.

Reason (R): The molecules that enter the reaction are not the same molecules that emerge from the reaction.
View answer and explanation
Correct option: B
Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
Option B is correct because both the assertion and reason are true, but the reason does not directly explain the assertion. The water molecules are split and reformed during photosynthesis.
17 Hard
17 of 40
Understanding +4 | -1
Assertion (A): During oxidation within a cell, all the energy contained in into the cell, in a single step.

Reason (R): The energy released by oxidation in respiration is not (or rather cannot be) used directly but is used to synthesise ATP.
View answer and explanation
Correct option: D
Both (A) and (R) are false
Option D (Both (A) and (R) are false) is correct because the energy is released in multiple steps, not a single step, and the energy is used to synthesize ATP.
18 Hard
18 of 40
Remembering +4 | -1
How much of the energy of a glucose molecule is released in anaerobic respiration ending with fermentation?
View answer and explanation
Correct option: C
Less than 7%
Option C (Less than 7%) is correct because anaerobic respiration, specifically fermentation, releases a very small amount of energy compared to aerobic respiration.
19 Hard
19 of 40
Understanding +4 | -1
During glycolysis, how many redox equivalents is/are removed by two PGAL molecules and transferred to NAD+\mathrm{NAD}^{+}?
View answer and explanation
Correct option: C
44
Option C (4) is correct because two PGAL molecules produce two NADH molecules, each carrying two redox equivalents, totaling four.
20 Hard
20 of 40
Remembering +4 | -1
The correct sequence of cytochromes in ETC is
View answer and explanation
Correct option: B
Cytb,c1,c,a,a3Cyt b, c_1, c, a, a_3
The correct answer is B (Cytb,c1,c,a,a3Cyt b, c_1, c, a, a_3) because this is the correct sequence of electron carriers (cytochromes) in the electron transport chain (ETC).
21 Hard
21 of 40
Understanding +4 | -1
Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R :

Assertion A : ATP is used at two steps in glycolysis.

Reason R : First ATP is used in converting glucose into glucose-6-phosphate and second ATP is used in
conversion of fructose-6-phosphate into fructose-1, 6-diphosphate.

In the light of the above statements, choose the correct answer from the options given below :
View answer and explanation
Correct option: C
Both A and R are true and R is the correct explanation of A
Option C (Both A and R are true and R is the correct explanation of A) is correct because ATP is indeed used at two steps in glycolysis, and the reason correctly identifies those two steps.
22 Hard
22 of 40
Understanding +4 | -1
Wounding of plant tissues will show
View answer and explanation
Correct option: A
Temporary increase in respiration
Option A is correct because wounding plant tissues temporarily increases respiration due to increased metabolic activity for repair.
23 Hard
23 of 40
Understanding +4 | -1
Respiratory pathway is?
View answer and explanation
Correct option: B
Amphibolic
Option B (Amphibolic) is correct because the respiratory pathway involves both the breakdown of molecules (catabolism) and the synthesis of molecules (anabolism).
24 Hard
24 of 40
Understanding +4 | -1
Assertion (A): When carbohydrates are used as substrate and are completely oxidised, the RQ will be 1.

Reason (R): The respiratory quotient depends upon the type of respiratory substrate used during respiration.
View answer and explanation
Correct option: B
Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
Option B is correct because while both the assertion and reason are true, the reason doesn't directly explain why the RQ is 1 when carbohydrates are completely oxidized; the RQ is 1 because the number of carbon atoms equals the number of oxygen molecules required for oxidation.
25 Hard
25 of 40
Application +4 | -1
Calculate the number of ATP produced for one G3P molecule by the end of aerobic respiration transport only?
View answer and explanation
Correct option: D
19
Option D (19) is correct because G3P enters the payoff phase of glycolysis and then proceeds through the Krebs cycle and ETC, yielding a specific amount of ATP.
26 Hard
26 of 40
Remembering +4 | -1
Maximum energy can be obtained from oxidation of which respiratory substrate?
View answer and explanation
Correct option: A
Fat
The correct answer is A (Fat) because fats yield more energy per gram upon oxidation compared to carbohydrates, proteins, or organic acids due to their higher proportion of carbon-hydrogen bonds.
27 Hard
27 of 40
Remembering +4 | -1
Mineral activator needed for the enzyme carboxylase of TCA cycle is:
View answer and explanation
Correct option: A
Mg++M{{g}^{++}}
The correct answer is A (Mg++M{{g}^{++}}) because magnesium ions (Mg++M{{g}^{++}}) are required as a cofactor for certain carboxylase enzymes in the TCA cycle.
28 Hard
28 of 40
Remembering +4 | -1
A characteristic feature of ripening of some fruits (like banana) is a sudden increase in respiration which is known as
View answer and explanation
Correct option: A
Climactric
Option A (Climactric) is correct because the sudden increase in respiration during fruit ripening is known as the climacteric rise.
29 Hard
29 of 40
Understanding +4 | -1
Assertion (A): For plant respiration there is no need of specialized respiratory organs.

Reason (R): Plants donot show great demands for gaseous exchange.
View answer and explanation
Correct option: A
Both (A) & (R) are true and the (R) is the correct explanation of the (A)
Option A is correct because plants have lower energy demands and utilize simple diffusion for gas exchange, negating the need for specialized respiratory organs.
30 Hard
30 of 40
Understanding +4 | -1
Which of the molecule listed below is a product of fermentation of Glucose by yeast?
View answer and explanation
Correct option: B
C2H5OH{C_2}{H_5}OH
Option B (C2H5OH{C_2}{H_5}OH) is correct because yeast fermentation of glucose produces ethanol (C2H5OH{C_2}{H_5}OH) and carbon dioxide.
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