NEET Biology Respiration In Plants MCQs Set A

Question: Breakdown of complex molecules to yield energy takes place in

• a) Cytoplasm and mitochondria
• b) Cytoplasm and plastids
• c) Chloroplast
• d) Mitochondria and chloroplast

Answer: Cytoplasm and mitochondria

Question: Respiration involves breaking of_______ bonds of complex compounds through oxidation within the cells, leading to release of considerable amount of energy.

• a) C — C
• b) C — O
• c) C — H
• d) None of these

Answer: C — C

Question: Read the following statements and choose the correct option

• a) Chemical energy is broken down during respiration to release energy
• b) Fungi can make their own food and derive the energy by respiration
• c) Reduction of food results in the release of energy
• d) Respiration is purely a catabolic process

Answer: Chemical energy is broken down during respiration to release energy

Question:  Respiration is seen in

• a) All living cells both during day and night
• b) Non green cells in light only
• c) Non green cells only
• d) All cells, except the photosynthetic cells during day

Answer: All living cells both during day and night

Question:  The compounds that are subjected to biological oxidation are called _______ in which ______ is the mostcommon

• a) Respiratory substrate, carbohydrate
• b) Respiratory organic substances, fats
• c) Respiratory substance, protein
• d) Respiratory substrate, protein

Answer:  Respiratory substrate, carbohydrate

Question: Which of the following substances can undergo oxidation and release energy?

• a) Both
• b) Organic acid
• c) Organic food
• d) None of these

Answer: Both

Question: Choose the incorrect option for why plants can get along without respiratory organs as plants, unlike animals, have no specialized organs for gaseous exchange

• a) Respiration rate is faster than animals in roots, stems and leaves
• b) Loose packing of parenchyma cells in leaves, stems and roots facilitates respiration
• c) There is very little transport of gases from one plant part to another
• d) None of these

Answer: Respiration rate is faster than animals in roots, stems and leaves

Question:  In floating respiration substrate used is/are

• a) Fat and carbohydrate
• b) Carbohydrate and protein
• c) Carbohydrate only
• d) Fat and protein

Answer: Fat and carbohydrate

Question: Those organism which cannot use oxygen for growth and are even harmed by its presence, are known as

• a) Obligate anaerobes
• b) Aerotolerant anaerobes
• c) Obligate aerobes
• d) Facultative anaerobes

Answer: Obligate anaerobes

Question: Facultative anaerobes

• a) Are aerobes which can grow without oxygen
• b) Cannot use oxygen for growth, but tolerate the presence of it
• c) Cannot use oxygen for growth and are even harmed by it
• d) Die when given aerobic condition

Answer: Are aerobes which can grow without oxygen

Question: What are the products of aerobic respiration?

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question:  Maximum energy can be obtained from oxidation of which respiratory substrate

• a) Fat
• b) Proteins
• c) Carbohydrates
• d) Organic acid

Answer: Fat

Question: Common step of both aerobic and anaerobic respiration are

• a) EMP pathway
• b) EMP pathway
• c) Tricarboxylic acid cycle
• d) Citric acid cycle

Answer: EMP pathway

Question: Which of the following pathway was given by Embden, Meyerhof and Parnas?

• a) Glycolysis
• b) Acetyl CoA formation step
• c) Pentose phosphate pathway
• d) Krebs cycle

Answer: Glycolysis

Question: Glycolysis occurs in

• a) All living cells
• b) Only eukaryotic cells
• c) Nerve cells
• d) Only muscle cells

Answer: All living cells

Question: All are true about glycolysis, except

• a) It produces one pyruvic acid molecule from each glucose
• b) Oxygen independent pathway
• c) It occurs in the cytoplasm of cell
• d) It can operate by using both glucose and fructose

Answer: It produces one pyruvic acid molecule from each glucose

Question: In EMP pathway, hexose sugar splits into two molecules of triose sugar by the catalytic activity of

• a) Aldolase
• b) Dehydrogenase
• c) Phosphofructokinase
• d) Transphosphorylase

Answer: Aldolase

Question: Interconversion of glyceraldehyde-3-phosphate and dihydroxyacetone phosphate is catalysed by which enzyme?

• a) Phosphotriose isomerase
• b) Phosphoglyceromutase
• c) Phosphohexose isomerase
• d) Triose kinase

Answer: Phosphotriose isomerase

Question: Reducing power NADH + H⁺ is produced during conversion step of glycolysis

• a) Glyceraldehyde-3-phosphate to 1,3-bisphosphoglyceric acid
• b) 3-phosphoglyceric acid to 2-phosphoglycerate
• c) 2-phosphoglycerate to phosphoenol pyrurvate
• d) Phosphoenol pyruvate to pyruvic acid

Answer: Glyceraldehyde-3-phosphate to 1,3-bisphosphoglyceric acid

Question: Which enzyme of glycolysis is also called as pacemaker enzyme?

• a) Phosphofructokinase
• b) Enolase
• c) Hexokinase
• d) Pyruvate kinase

Answer: Phosphofructokinase

More Questions................................................

Question: Choose correct option w.r.t. anaerobic respiration

• a) All reactions occur in the cytoplasm
• b) The first oxidation step occur in mitochondria
• c) They require oxygen only at one step
• d) First step of eaction occur in cytoplasm then in mitochondria

Answer: All reactions occur in the cytoplasm

Question: Products of anaerobic respiration are

• a) Ethyl alcohol, CO₂ or lactic acid
• b) Ethyl alcohol and lactic acid only
• c) Both
• d) None of these

Answer:  Ethyl alcohol, CO₂ or lactic acid

Question: End product of anaerobic respiration is

• a) Lactic acid
• b) Phosphoglyceric acid
• c) Pyruvic acid
• d) Glyceraldehyde phosphate

Answer: Lactic acid

Question: After glycolysis, first step of ethyl alcohol fermentation requires

• a) Decarboxylation
• b) Dehydrogenation
• c) FAD reduction
• d) None of these

Answer: Decarboxylation

Question: Concentration of alcohol in a sugar solution inoculated with yeast after which yeast gets killed is

• a) 13%
• b) 25%
• c) 30%
• d) 20%

Answer: 13%

Question: Cramps are formed during vigorous exercise, it is due to production of _____ in muscles.

• a) Lactic acid
• b) Acetic acid
• c) Ethyl alcohol
• d) Acetyl coenzyme A

Answer: Lactic acid

Question:

• a) (i) Phosphoenol pyruvate; (ii) Ethyl alcohol
• b) (i) Phosphoenol pyruvate; (ii) Acetyl CoA
• c) (i) 2-phosphoglycerate; (ii) Acetyl CoA
• d) (i) Phosphoenol pyruvate; (ii) Citric acid

Answer: (i) Phosphoenol pyruvate; (ii) Ethyl alcohol

Question: During cellular respiration, number of ATP used during conversion of glucose into glyceraldehyde-3-phosphate is

• a) 2
• b) 4
• c) 1
• d) 3

Answer: 2

Question:

• a) Pyruvate dehydrogenase
• b) Pyruvate oxidase
• c) Phosphoglucomutase
• d) Pyruvate carboxylase

Answer: Pyruvate dehydrogenase

Question: Number of acetyl CoA formed from one molecule of glucose is

• a) 2
• b) 1
• c) 4
• d) 6

Answer: 2

Question: Connecting link between glycolysis and TCA cycle is

• a) Link reaction
• b) Citric acid cycle
• c) EMP pathway
• d) ETC

Answer:  Link reaction

Question: How many carbon atoms are present in Acetyl CoA?

• a) 6
• b) 4
• c) 3
• d) 2

Answer: 6

Question: Which of the following product is formed by Krebs cycle?

• a) ATP
• b) ADP
• c) Acetyl CoA
• d) NAD⁺

Answer: ATP

Question: Citric acid is formed in Krebs cycle by the combination of oxaloacetate with

• a) Acetyl CoA
• b) Pyruvic acid
• c) OAA
• d) Malic acid

Answer: Acetyl CoA

Question: The enzymes of Krebs cycle where NADH + H⁺ are produced are

• a)

  

• b)

  

• c) Isocitrate dehydrogenase, succinate dehydrogenase and malic dehydrogenase
• d) Succinate thiokinase, succinate dehydrogenase and aconitase

Answer:  

Question: How many molecules of CO₂ are released during two turns of Krebs cycle?

• a) 3
• b) 4
• c) 6
• d) 2

Answer: 3

Question: What is the net gain in a Krebs cycle?

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: Succinate dehydrogenase catalyzes the formation of

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: Where does ETS occur in our body?

• a) Inner mitochondrial membrane
• b) Cytoplasm
• c) Mitochondrial matrix
• d) Outer mitochondrial membrane

Answer: Inner mitochondrial membrane

Question: How many complexes are involved in electron transport in mitochondria?

• a) 4
• b) 5
• c) 2
• d) 1

Answer: 4

Question:

• a) II
• b) I
• c) III
• d) IV

Answer: II

Question: Last acceptor of electrons is _____ in ETS which give electrons to oxygen.

• a)

  

• b)

  

• c)

  

• d) Cyt c

Answer:

Question: Ubiquinone receives reducing equivalents from

• a) Both
• b) NADH + H⁺
• c) FADH₂
• d) None of these

Answer: Both

Question: Mobile electron carrier in ETS in mitochondrial membrane is

• a) Cyt c
• b) Complex I
• c)

  

• d)

  

Answer: Cyt c

Question: Protons for the formation of ATP first pass from

• a)

  

• b)

  

• c) Cyt c
• d) Complex II

Answer:

Question:  How many ATP molecules are formed by oxidative phosphorylation from NADH produced during single Krebs cycle?

• a) 9
• b) 30
• c) 18
• d) 6

Answer: 9

Question: The efficiency of aerobic respiration is approximately

• a) 45%
• b) 90%
• c) 30%
• d) 50%

Answer: 45%

Question: Total energy obtained from 38 ATP is _____ kJ.

• a) 1292
• b) 1392
• c) 1398
• d) 1298

Answer: 1292

Question: Intermediate common to proteins and carbohydrate oxidation is

• a) Pyruvate
• b) Glycerol
• c) Oxaloacetate
• d) Succinate

Answer: Pyruvate

Question: Which of these has R.Q. value more than one?

• a) Organic acids
• b) Carbohydrate
• c) Protein
• d) Fat

Answer: Organic acids

Question: Which of the given enzymes of glycolysis is required at the beginning of process?

• a) Hexokinase
• b) Aldolase
• c) Isomerase
• d) Mutase

Answer: Hexokinase

Question: Conversion of fructose-6-phosphate to fructose-1,6-bisphosphate in respiration requires

• a) Phosphofructokinase
• b) Hexokinase
• c) Enolase
• d) Pyruvate kinase

Answer: Phosphofructokinase

Question: Select the statement which is not related to fermentation

• a) ETS gives 11ATP for each Krebs cycle
• b) NADH is oxidized slowly as compared to aerobic respiration
• c) It gives only 2ATP as net for glucose degradation upto pyruvic acid
• d) It accounts for only a partial breakdown of glucose

Answer: ETS gives 11ATP for each Krebs cycle

Question: First step of ethyl alcohol fermentation requires

• a) Decarboxylation
• b) FMN
• c) Dehydrogenation
• d) Zn²⁺

Answer: Decarboxylation

Question: How many redox equivalents are removed from two molecules of 3-PGAL?

• a) 4
• b) 1
• c) 2
• d) 3

Answer: 4

Question: Primary acceptor of TCA cycle is

• a) OAA
• b) Acetyl CoA
• c) Citric acid
• d) Pyruvic acid

Answer: OAA

Question: In TCA cycle, how many reduced coenzymes are produced from one Acetyl CoA?

• a)

  

• b)

  

• c)

  

• d)

  

Answer:

Question: 5C intermediate molecule in TCA cycle is

• a)

  

• b) Fumaric acid
• c) Succinyl CoA
• d) Citric acid

Answer:

Question: Number of total ATP generated in TCA cycle per Acetyl CoA molecule is

• a) 12
• b) 10
• c) 14
• d) 24

Answer: 12

Question: Substrate level phosphorylation in TCA occurs when

• a) Succinyl CoA changes to succinic acid
• b) Succinic acid changes to fumaric acidFumaric acid changes to malic acid
• c) Fumaric acid changes to malic acid
• d)

  

Answer: Succinyl CoA changes to succinic acid