Explore Exams
Login Signup
Sign in Open App
All Exams  >   NEET  >   NCERT Based Tests for NEET  >   All Questions

All questions of Respiration in Plants for NEET Exam

In plants, the gaseous exchange take place in
a) Stomata
b) Roots
c) Stems
d) Lenticles
  • a)
    a and b
  • b)
    a and d
  • c)
    b and d
  • d)
    b and c
Correct answer is option 'B'. Can you explain this answer?

Geetika Shah answered
Plants unlike animals have no special systems for breathing or gaseous exchange. Stomata and lenticels allow gaseous exchange by diffusion.
Clear all your doubts with EduRev

Which of the following is not correct about the Krebs cycle?
  • a)
    It starts with a six-carbon compound.
  • b)
    It occurs in mitochondria.
  • c)
    It is also called the citric acid cycle.
  • d)
    The intermediate compound which links glycolysis with the Krebs cycle is malic acid.
Correct answer is option 'D'. Can you explain this answer?

Om Desai answered
  1. Krebs cycle is also known as the citric acid cycle because this reaction starts with the six-carbon compound which is citric acid. It occurs in the mitochondrial matrix.
  2. Krebs cycle is a closed-loop cycle. And each loop of the cycle generates a molecule of ATP. This cycle consists of eight steps which include redox, dehydration, hydration, and decarboxylation reactions. It is an aerobic pathway because NADH is produced and the electrons released are used up in the next cycle which uses oxygen.
  3. The process of the cycle starts with the condensation of acetyl- CoA with oxaloacetate.
  4. This reaction is controlled by the amount of ATP present.
  5. If the ATP level increases then the rate of the reaction decreases and vice versa. After glycolysis, the pyruvate is then converted into acetyl CoA which enters the citric acid cycle.
  6. The Krebs cycle is the pathway that all organisms use to generate energy. The intermediate compound that links pyruvate to the Krebs cycle is Acetyl CoA.
  7. So, the answer is option (B) ‘the intermediate compound which links glycolysis with the Krebs cycle is malic acid’.

F0−F1 particles participate in the synthesis of
  • a)
    NADPH
  • b)
    FADH2
  • c)
    ADP
  • d)
    ATP
Correct answer is option 'D'. Can you explain this answer?

Lalit Yadav answered
  • Oxysomes refer to small round structures present within the folds of the cristae of the inner mitochondrial membrane. It is also known as F0-F1 particles.
  • F0 and F1 particles are found in the inner mitochondrial region and are attached to the cristae and help in ATP production and oxidation.

The TCA cycle is named after
  • a)
    Robert Emerson
  • b)
    Melvin Calvin
  • c)
    Embden
  • d)
    Hans Krebs
Correct answer is option 'D'. Can you explain this answer?

Hitakshi Tamta answered
*Tricarboxylic acid (TCA) cycle is a series of enzyme-catalyzed chemical reactions used by all aerobic organisms to release the stored energy........ *It is a part of cellular respiration........ *It is also called as citric acid cycle or Krebs cycles which is named after it's discoverer Hans Krebs..... Thus, the correct answer is option 'D'.

During anaerobic respiration less energy is produced than aerobic respiration because
  • a)
    Incomplete oxidation of glucose takes place
  • b)
    It takes place is micrograms
  • c)
    It takes place in inert medium
  • d)
    Glucose is not available
Correct answer is option 'A'. Can you explain this answer?

Kuldeep Kuldeep answered
Option a is correct. Because, in Anaerobic Respiration, respiration takes place on the absence of oxygen. Iteans, the oxidation of pyruvate takes place in the absence of oxygen to release CO2, Ethanol along with the release of Energy. Here, in Anaerobic Respiration, Water is not yet released due to the absence of oxygen. So, there will be incomplete oxidation of glucose takes place.

Energy obtained by a cell from catabolic reaction is stored immediately in the form of
  • a)
    Pyruvic acid
  • b)
    Glucose
  • c)
    ATP
  • d)
    DNA
Correct answer is option 'C'. Can you explain this answer?

Hitakshi Tamta G answered
The energy obtained by a cell from catabolic reactions is stored immediately in the form of ATP, as it is the energy currency of the cell.
Hence, option 'C' is correct.

Most of the enzymes of the TCA cycle are present in
  • a)
    Intermembrane space of mitochondria
  • b)
    Mitochondrial matrix
  • c)
    Inner membrane of mitochondria
  • d)
    Cytoplasm
Correct answer is option 'B'. Can you explain this answer?

Anjali Iyer answered
Mitochondrial matrix.
In the mitochondrion, the matrix is the space within the inner membrane. ... The enzymes in the matrix facilitate reactions responsible for the production of ATP, such as the citric acid cycle, oxidative phosphorylation, oxidation of pyruvate and the beta oxidation of fatty acids.

When fats are the respiratory substrate, the value of RQ would be​
  • a)
    Approx. 0.7
  • b)
    Approx. 1.0
  • c)
    More than 1.0
  • d)
    None of the above
Correct answer is option 'A'. Can you explain this answer?

Surbhi Mishra answered
Ans.

The respiratory quotient (or RQ or respiratory coefficient), is a dimensionless number used in calculations of basal metabolic rate (BMR) when estimated from carbon dioxide production. ... If metabolism consists solely of lipids, the Respiratory Quotient is 0.7, for proteins it is 0.8, and for carbohydrates it is 1.0.

Mitochondria are called the powerhouses of the cell. Which of the following observations support this statement?
  • a)
    Mitochondria are found in almost all plant and animal cells.
  • b)
    The enzymes of the Krebs cycle and the cytochromes are found in mitochondria.
  • c)
    Mitochondria synthesise ATP.
  • d)
    Mitochondria have a double membrane.
Correct answer is option 'C'. Can you explain this answer?

Riya Banerjee answered
Mitochondria (singular - Mitochondrion) are known as the powerhouse of the cell because they are responsible for the release of energy from food ,i.e, cellular respiration. This energy is released in the form of ATP (adenosine triphosphate), the energy currency of the cell.
While the cells release 2 ATP, mitochondria releases 34 ATP which adds up to 36 ATP. Since a major portion of the ATP is released by mitochondria, they are called the powerhouse of the cell.

End-products of aerobic respiration are
  • a)
    Carbon dioxide and energy
  • b)
    Sugar and oxygen
  • c)
    Carbon dioxide, water and energy
  • d)
    Water and energy
Correct answer is option 'C'. Can you explain this answer?

Vartika Shukla answered
Aerobic respiration is the complete oxidation of sugars in presence of oxygen.
The carbohydrates are broken down into CO₂ and H₂O and this releases energy. This energy is stored in the form of ATP and later used in the body.
So, the correct option is 'Carbon dioxide, water, and energy'

Which of the following is coenzyme - II ?
  • a)
    NAD
  • b)
    NADP
  • c)
    FAD
  • d)
    None of the above
Correct answer is option 'B'. Can you explain this answer?

Moumita Khanna answered
Ans.

Nicotinamide adenine dinucleotide phosphate. A coenzyme composed of ribosylnicotinamide 5'-phosphate (NMN) coupled by pyrophosphate linkage to the 5'-phosphate adenosine 2',5'-bisphosphate. It serves as an electron carrier in a number of reactions, being alternately oxidized (NADP+) and reduced (NADPH). (Dorland, 27th ed)

(Synonyms:
coenzyme II
NADP
NADP(+)
triphosphopyridine nucleotide
beta-NADP+)


Oxidation of one molecule of glucose in aerobic respiration results in the production of
  • a)
    36 ATP molecules
  • b)
    38 ATP molecules
  • c)
    3 ATP molecules
  • d)
    15 ATP molecules
Correct answer is option 'B'. Can you explain this answer?

User4284711 answered
• Total ATP during aerobic glycolysis = 8ATP
• In pyruvic acid oxidation ATP produced = 6 ATP
• In Krebs cycle ATP produced =24 ATP
therefore total ATP produced is 38 ATP

Excess of ATP inhibits the enzyme –
  • a)
    Phosphofructokinase
  • b)
    Hexokinase
  • c)
    Aldolase (Lyases)
  • d)
    Pyruvate decarboxylase
Correct answer is option 'A'. Can you explain this answer?

Rajat Kapoor answered
Phosphofructokinase-1 (PFK-1) is one of the most important regulatory enzymes (EC 2.7.1.11) of glycolysis. It is an allosteric enzyme made of 4 subunits and controlled by many activators and inhibitors. For example, a high ratio of ATP to ADP will inhibit PFK and glycolysis.

Pyruvic acid, the key product of glycolysis, can have many metabolic fates. Under aerobic conditions, it forms​
  • a)
    CO2
  • b)
    CO2+ H2O
  • c)
    Lactic acid
  • d)
    Acetyl CoA + CO2
Correct answer is option 'D'. Can you explain this answer?

Rohit Shah answered
Pyruvate, the product obtained through glycolysis, gets oxidised with the loss of its carboxy group as CO2, to give acetyl Co-A, under aerobic condition. This acetyl Co-A is further oxidised completely to CO2 + H2O in citric acid cycle. Other options are incorrect as Lactic acid is formed in muscles under anaerobic conditions. Ethanol and CO2 are products of anaerobic respiration in yeast cells. CO2 and H2O are final and complete reaction products released at the end of cellular respiration.   

Energy equivalent of NADH is how many number of ATP molecules?​
  • a)
    2
  • b)
    3
  • c)
    38
  • d)
    6
Correct answer is option 'B'. Can you explain this answer?

Ambition Institute answered
Each NADH molecule theoretically yields 3 ATP molecules during chemiosmosis. However, in some tissues, NADH requires more energy to cross the mitochondrial membrane and some of its potential is lost.

The TCA cycle starts with
  • a)
    Condensation
  • b)
    Dehydrogenation
  • c)
    Phosphorylation
  • d)
    Decarboxylation
Correct answer is option 'A'. Can you explain this answer?

Anand Jain answered
The TCA cycle starts with the condensation of acetyl group with oxaloacetic acid (OAA) and water to yield citric acid.

The overall goal of glycolysis, Krebs cycle and electron transport system is the formation of
  • a)
    Nucleic acids
  • b)
    ATP in small stepwise units
  • c)
    ATP in one large oxidation reaction
  • d)
    Sugars
Correct answer is option 'B'. Can you explain this answer?

Ciel Knowledge answered
The overall goal of glycolysis, Krebs cycle and electron transport system is the formation of ATP step-wise. The three processes are involved in cellular respiration of food to produce energy, which will be used for various cellular activities. 

The enzyme that interconnects the glycolysis and kreb cycle is
  • a)
    Oxalo acetic acid
  • b)
    NADH
  • c)
    Acetyl-CoA
  • d)
    NADP
Correct answer is option 'C'. Can you explain this answer?

Ashutosh Nambiar answered
Explanation:
The interconnection between glycolysis and the Krebs cycle occurs through the conversion of pyruvate to Acetyl-CoA.

Glycolysis:
Glycolysis is the process of breaking down glucose into pyruvate. It occurs in the cytoplasm of the cell and yields two molecules of ATP along with two molecules of NADH.

Krebs Cycle:
The Krebs cycle, also known as the citric acid cycle, occurs in the mitochondria of the cell. It involves the oxidation of Acetyl-CoA to produce energy in the form of ATP, NADH, and FADH2.

Interconnection:
The interconnection between glycolysis and the Krebs cycle occurs through the conversion of pyruvate to Acetyl-CoA. Pyruvate is transported from the cytoplasm to the mitochondria, where it is converted to Acetyl-CoA by the enzyme pyruvate dehydrogenase.

Acetyl-CoA is then used in the Krebs cycle to produce energy in the form of ATP, NADH, and FADH2. The Krebs cycle produces NADH, which is used in the electron transport chain to produce more ATP.

Therefore, Acetyl-CoA is the enzyme that interconnects glycolysis and the Krebs cycle.

Choose the correct statement.
  • a)
    There is a complete breakdown of glucose during fermentation.
  • b)
    Pyruvate is formed in the mitochondrial matrix.
  • c)
    During the conversion of succinyl CoA to succinic acid, a molecule of ATP is synthesised.
  • d)
    Oxygen is vital in respiration for the removal of hydrogen.
Correct answer is option 'D'. Can you explain this answer?

Hansa Sharma answered
  • Oxygen sits at the end of the electron transport chain, where it accepts electrons, hydrogen and picks up protons to form water.
  • Pyruvate is formed in the cytoplasm.
  • During fermentation glucose is partially broken down by glycolysis.
  • During the conversion of succinyl CoA to succinic acid a molecule of GTP is synthesized.
So, the correct option is 'Oxygen is vital in respiration for removal of hydrogen'.

In which of the following do the two names refer to one and the same thing?
  • a)
    Krebs cycle and Calvin cycle
  • b)
    Citric acid cycle and Calvin cycle
  • c)
    Tricarboxylic acid cycle and citric acid cycle
  • d)
    Tricarboxylic acid cycle and urea cycle
Correct answer is option 'C'. Can you explain this answer?

Hridoy Chawla answered
The correct answer is option 'C' - Tricarboxylic acid cycle and citric acid cycle.

Explanation:


Tricarboxylic Acid Cycle:
- The tricarboxylic acid cycle, also known as the TCA cycle or the Krebs cycle, is a series of chemical reactions that take place in the mitochondria of eukaryotic cells.
- It is an important part of aerobic respiration, which generates energy in the form of ATP (adenosine triphosphate) by breaking down carbohydrates, fats, and proteins.
- The cycle involves a series of enzymatic reactions that ultimately produce carbon dioxide, ATP, and electron carriers (NADH and FADH2).

Citric Acid Cycle:
- The citric acid cycle, also known as the Krebs cycle or the tricarboxylic acid cycle, is a part of the metabolic pathway that occurs in the mitochondria of all aerobic organisms.
- It is named after the first intermediate compound formed during the cycle, which is citric acid.
- The citric acid cycle is an essential component of cellular respiration as it plays a crucial role in the oxidation of carbohydrates, fats, and proteins to produce ATP.

Comparison:


Tricarboxylic Acid Cycle and Citric Acid Cycle refer to the same metabolic pathway. The only difference lies in their names and the nomenclature used in different scientific texts or contexts. The terms "tricarboxylic acid cycle" and "citric acid cycle" are used interchangeably to describe the same set of reactions occurring in the mitochondria.

Therefore, the correct answer is option 'C' - Tricarboxylic acid cycle and citric acid cycle, as they both refer to the same metabolic pathway involved in cellular respiration.

What is the importance of respiration in organisms?
  • a)
    It provides oxygen to plant
  • b)
    It liberates CO2
  • c)
    It liberates energy
  • d)
    All the above
Correct answer is option 'B'. Can you explain this answer?

Raza Great answered
Respiration is a catabolic process, which oxidises reduced substrates, thus, resulting in the energy stored in reduced substrates. The reduced substrates are produced by the process of photosynthesis occurring in green plants and the reduced substrates are oxidised through respiration releasing CO2​, water vapour and energy in the form of ATP.

Aerobic respiration of glucose produces energy
  • a)
    637 K.Cal
  • b)
    640 K.cal
  • c)
    686 K.cal
  • d)
    693 K.cal
Correct answer is option 'C'. Can you explain this answer?

Ciel Knowledge answered
Free energy available from the complete oxidation of glucose to carbon dioxide and water under standard conditions (pH 7.0 and temperature 298 K) is 686 Kcal or 2840 KJ per moles. But these values are obtained under the standard set of conditions not under physiological conditions in a cell. To describe the energy released under the conditions existing in cells, an expression for the actual free-energy change is essential.

 The net gain of ATP molecules by glycolysis is
  • a)
    Zero
  • b)
    Two
  • c)
    Four
  • d)
    Eight
Correct answer is option 'B'. Can you explain this answer?

Sameer Roy answered
Glycolysis is the initial stage of both aerobic and anaerobic respiration. It occurs in the cytoplasm of cells and involves the breakdown of glucose into pyruvate. In the process, ATP molecules are produced.

Net Gain of ATP Molecules by Glycolysis

The net gain of ATP molecules by glycolysis is two. This occurs through the following steps:

1. Energy Investment Phase

In this phase, two ATP molecules are used to convert glucose into fructose-1,6-bisphosphate. This reaction is catalyzed by the enzyme phosphofructokinase.

Glucose + 2ATP → Fructose-1,6-bisphosphate + 2ADP

2. Cleavage Phase

In this phase, fructose-1,6-bisphosphate is cleaved into two molecules of glyceraldehyde-3-phosphate. This reaction is catalyzed by the enzyme aldolase.

Fructose-1,6-bisphosphate → 2 Glyceraldehyde-3-phosphate

3. Energy Liberation Phase

In this phase, each molecule of glyceraldehyde-3-phosphate is converted into pyruvate. This reaction involves the production of four ATP molecules and two NADH molecules.

2 Glyceraldehyde-3-phosphate + 4ADP + 2Pi + 2NAD+ → 2 Pyruvate + 4ATP + 2NADH + 2H+

Overall, the net gain of ATP molecules by glycolysis is two. This is because two ATP molecules are used in the energy investment phase, and four ATP molecules are produced in the energy liberation phase, resulting in a net gain of two ATP molecules.

R.Q is less than unity in case of
  • a)
    Protein
  • b)
    Organic acid
  • c)
    Carbohydrates
  • d)
    Starch
Correct answer is option 'A'. Can you explain this answer?

Prashanth Dasgupta answered
Respiratory quotient is the ratio of number of carbon dioxide molecules to the number of oxygen molecules during respiration. R.Q is less than one in case of protein

 The universal hydrogen acceptor is
  • a)
    NAD
  • b)
    ATP
  • c)
    Co-A
  • d)
    FMN
Correct answer is option 'A'. Can you explain this answer?

ภ๏๓คคภ answered
The universal hydrogen acceptor is NAD (Nicotinamide adenine dinucleotide). It is knows as universal hydrogen acceptor because it gets easily reduced by combining with a hydrogen bond.

In respiration pyruvic acid is
  • a)
    Formed only when oxygen is available
  • b)
    One of product of Krebs cycle
  • c)
    Broken down into Acetyl Co-A and CO2
  • d)
    a result of protein break down
Correct answer is option 'C'. Can you explain this answer?

Pooja Shah answered
Respiration occurs in two stages. In the first stage called as glycolysis, which occurs in the absence of oxygen, one molecule of hexose glucose is broken down into two molecules of three carbon atom containing pyruvic acid. Each molecule of pyruvic acid is then oxidatively decarboxylated by the enzyme pyruvate dehydrogenase. The pyruvate dehydrogenase releases one molecule of carbon dioxide from each molecule of pyruvic acid during its conversion to Acetyl CoA. The Acetyl CoA is subsequently metabolised in Krebs cycle generating reduced coenzymes.

Where does the synthesis of enzyme occur in a cell
  • a)
    Inside the nucleus
  • b)
    In lysosomes
  • c)
    On the surface of ribosome
  • d)
    Inside the vacuole
Correct answer is option 'C'. Can you explain this answer?

Vijay Bansal answered
Protein synthesis occurs in cellular structures called ribosomes , found out-side the nucleus. The process by which genetic information is transferred from the nucleus to the ribosomes is called transcription. During transcription, a strand of ribonucleic acid (RNA) is synthesized.

End product of glycolysis is
  • a)
    Citric acid
  • b)
    Glyceraldehyde
  • c)
    Phosphoglyceraldehyde
  • d)
    Pyruvic acid
Correct answer is option 'D'. Can you explain this answer?

Shalini Basak answered
Explanation:
Glycolysis is a metabolic pathway that breaks down glucose into two molecules of pyruvate. This process occurs in the cytoplasm of the cell and is the first step in both aerobic and anaerobic respiration. The end product of glycolysis is pyruvic acid.

Steps of Glycolysis:
1. Glucose is converted into glucose-6-phosphate with the help of enzyme hexokinase.
2. Glucose-6-phosphate is converted into fructose-6-phosphate with the help of enzyme phosphohexose isomerase.
3. Fructose-6-phosphate is converted into glyceraldehyde-3-phosphate and dihydroxyacetone phosphate with the help of enzyme aldolase.
4. Dihydroxyacetone phosphate is converted into glyceraldehyde-3-phosphate with the help of enzyme triose phosphate isomerase.
5. Glyceraldehyde-3-phosphate is oxidized into 1,3-bisphosphoglycerate with the help of enzyme glyceraldehyde-3-phosphate dehydrogenase.
6. 1,3-bisphosphoglycerate is converted into 3-phosphoglycerate with the help of enzyme phosphoglycerate kinase.
7. 3-phosphoglycerate is converted into 2-phosphoglycerate with the help of enzyme phosphoglycerate mutase.
8. 2-phosphoglycerate is converted into phosphoenolpyruvate with the help of enzyme enolase.
9. Phosphoenolpyruvate is converted into pyruvic acid with the help of enzyme pyruvate kinase.

Importance of Pyruvic Acid:
Pyruvic acid is a key intermediate in several metabolic pathways. In aerobic respiration, pyruvic acid is converted into acetyl-CoA, which enters the citric acid cycle. In anaerobic respiration, pyruvic acid is converted into lactate or ethanol. Pyruvic acid also plays a role in gluconeogenesis, the process by which glucose is synthesized from non-carbohydrate sources.

Dough kept overnight in warm weather becomes soft and spongy due to
  • a)
    Absorption of CO2​ from atmosphere
  • b)
    Imbibition
  • c)
    Fermentation
  • d)
    All of these
Correct answer is option 'C'. Can you explain this answer?

Geetika Shah answered
  • Fermentation can be described as an enzyme-catalyzed process in which one substrate is usually broken down by the enzymes produced by bacteria, yeast, and other microorganisms.
  • Fermentation of glucose results in the formation of ethanol and carbon monoxide. This is an exothermic reaction and results in the release of energy. The changes observed in dough after keeping it overnight in warm weather is an example of fermentation.

A.T.P. is
  • a)
    A hormone
  • b)
    A protein
  • c)
    An enzyme which brings about  oxidation
  • d)
    A molecule which contain high energy bond
Correct answer is option 'D'. Can you explain this answer?

Suresh Kumar answered
ATP->Adenosine triphosphate...is also known as energy currency of a cell...Hence; option D holds true here....
whereas ;
Mitochondria is known as Powerhouse of the cell..

Kreb's cycle takes place in
  • a)
    Vesicles of E.R.
  • b)
    Mitochondrial matrix
  • c)
    Dictyosomes
  • d)
    Lysosomes
Correct answer is option 'B'. Can you explain this answer?

Suresh Kumar answered
Site of glycolysis(EMP pathway) ->Cytoplasm...
Site of Krebs cycle(TCA cycle)->Mitochondrial matrix..
Hence ; option B is true..

________ is an obligate anaerobe.
  • a)
    Saccharomyces cerevisiae
  • b)
    Clostridium tetani
  • c)
    Azotobacter
  • d)
    Beijerinckia
Correct answer is option 'B'. Can you explain this answer?

Preeti Iyer answered
  • According to the mode of respiration, bacteria can be aerobic or anaerobic. Each of them is further of two types, obligate and facultative.
  • Obligate anaerobic bacteria respire only anaerobically. They generally get killed under aerobic conditions, e.g., Clostridium tetani, C. botulinum etc.
  • Facultative anaerobes are bacteria which generally respire aerobically but switch over to anaerobic mode of respiration, if oxygen becomes deficient, e.g., Saccharomyces cerevisiae.

Chapter doubts & questions for Respiration in Plants - NCERT Based Tests for NEET 2025 is part of NEET exam preparation. The chapters have been prepared according to the NEET exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for NEET 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.

Chapter doubts & questions of Respiration in Plants - NCERT Based Tests for NEET in English & Hindi are available as part of NEET exam. Download more important topics, notes, lectures and mock test series for NEET Exam by signing up for free.

Top Courses NEET

Related NEET Content

© EduRev
Education Revolution
Signup to see your scores go up
within 7 days!
Takes less than 10 seconds to signup