MCQ on Respiration in Plants    

MCQ on Respiration in Plants  MCQ on Respiration in Plants 

1. A businessman of 80 kg weight requires 4800 kcal energy daily. How many ATP molecules and glucose molecules does he require to produce this much energy?

a) 20 molecules of glucose and 384 molecules of ATP

b) 40 molecules of glucose and 264 molecules of ATP

c) 18 molecules of glucose and 657 molecules of ATP

d) 20 molecules of glucose and 460 molecules of ATP

2. Which one of the following pairs is wrongly matched?

a) Methanogens – Gobar gas     
b) Yeast – Ethanol
c) Streptomycetes – Antibiotic  
d) Coliforms – Vinegar

3. In hurdle race, which of the following is accumulated in the leg muscle?

a) Performed ATP           
b) Glycolysis      
c) Lactate
d) Oxidative metabolism

4. During the exercise, pyruvic acid is reduced to

a) Lactic acid      
b) Fumaric acid 
c) Glutamic acid
d) Oxaloacetic acid

5. The compounds which are oxidised during respiration are known as

a) Respiratory substrates             
b) Oxalo acid
c) TCA cycle       
d) None of these

6. Refer the given equation

2(C₅₁H₉₈O₆) +145 O₂→102 CO₂+98 H₂ O+ Energy

The respiratory quotient in this case is

a) 1        
b) 0.7    
c) 1.45  
d) 1.62

7. Energy required for life processes is obtained by

a) Oxidation      
b) Reduction     
c) Deduction     
d) Antilation

8. Choose the correct statement for the given options

a) Intermediates in the pathway are utilised to synthesise other compounds

b) No alternative substrates other than glucose is allowed to enter the pathway at intermediate stages

c) None of the substrate is respired in the pathway at intermediary stages

d) Pathway functioning is in sequential

9. In plants, glucose is derived from which of the following?

a) Protein           
b) Fat   
c) Oxalic acid     
d) Sucrose

10. The chemiosmotic coupling hypothesis of oxidative phosphorylation proposes that adenosine triphosphate (ATP) is formed because

a) High energy bonds are formed in mitochondrial proteins         
b) ADP is pumped out of the matrix into the intermembrane space
c) A proton gradient forms across the inner membrane  
d) There is a change in the permeability of the inner mitochondrial membrane towards adenosine diphosphate (ADP)

11. The process by which there is inhibition of aerobic respiration by atmospheric oxygen is

a) Pasteur’s effect          
b) Calvin’s effect             
c) Darwin’s effect            
d) None of these

12. More carbon dioxide is evolved than the volume of oxygen consumed when the respiratory substrate is

a) Fat
b) Sucrose
c) Glucose          
d) Organic acid

13. Anaerobic respiration is also called as

a) β-oxidation   
b) Fermentation              
c) Oxidation       
d) None of these

14. The main purpose of cellular respiration is to

a) Convert potential energy to kinetic energy

b) Convert kinetic energy to potential energy

c) Create energy in the cell

d) Convert energy stored in the chemical bonds of glucose to an energy that the cell can use

16. Five- gram mole of glucose on complete oxidation releases

a) 3430 kcal of energy   
b) 343 kcal of energy     
c) 2020 kcal of energy   
d) 430 kcal of energy

17. NADP, NAD and FAD are acceptors of

a) Phosphate    
b) Electrons       
c) Oxygen           
d) Hydrogen

18. How many PGAL are produced by glycolysis of 3 molecules of glucose? How many ATP are released by respiration of these PGAL till formation of CO_2 and H_2O?

a) 4 PGAL- 80 ATP           
b) 6 PGAL-160ATP           
c) 4 PGAL-40ATP             
d) 6 PGAL-120ATP

19. Identify the specific group, which carries out the following biochemical reaction:

Aspartic acid+α-ketoglutaric acid →Oxaloacetic acid+Glutamic acid

a) Synthetases 
b) Peptidases   
c) Transaminases            
d) Lyases

20. Which of following is connecting link between glycolysis and Krebs’ cycle?

a) Pyruvic acid

b) Isocitric acid

c) Acetyl Co-A

d) Phosphoglyceric acid

1              (a)

Krebs’ cycle takes place in matrix of mitochondria. Largest amount of phosphate bond energy is produced in Krebs’ cycle due to oxidation by O₂. We get 6CO₂, 8NADH₂, 2FADH₂ and 2ATP molecules in Krebs’ cycle.

2              (a)

In electron transport system, last electron acceptor is oxygen

3 (a)

Glucose and fructose are both converted to ethanol and carbon dioxide in presence of Zymase enzyme

4              (c)

Glycolysis is the degradation of glucose molecule with net gain of 2ATP molecules per glucose molecule. It occurs both in aerobic and anaerobic conditions.

5    (d)

For fatty substances, RQ is generally less than one.

6              (a)

DCMU is a herbicide which acts as an inhibitor of non-cyclic electron transport; PMA is fungicide which reduces transpiration; colchicines is an antimicrobial drug, it causes prevention of mitotic spindle formation thus blocking the mitosis.

7              (a)

With the complete oxidation of pyruvate by the stepwise removal of all the hydrogen atoms form 3 molecules of CO₂, which occurs in matrix of the mitochondria

8              (a)

In anaerobic respiration bacteria produce lactic acid from pyruvic acid

9              (a)

Strains of Saccharomyces cerevisiae (yeast) are extensively used for leavening of bread. During fermentation, the yeasts produce alcohol and carbon dioxide, which leave and the leavened bread becomes porous.

10           (c)

Before entering respiratory pathway amino acids are deaminated

11           (b)

Pyruvic acid is an intermediate compound common for aerobic and anaerobic respiration because it is the end product in glycolysis and initial product in anaerobic respiration.

12 (a)

During alcoholic fermentation of glucose molecule, pyruvic acid is first decarboxylated to form acetaldehyde and CO₂, which is then changed to ethyl alcohol with help of NADH. Net gain is 2ATP molecules per glucose molecule.

13           (b)

4 ATP are formed in glycolysis but 2 ATP used

2 ATP in Krebs’ cycle

34 ATP from electron transport chain

40 ATP

14           (c)

It is a fact that the living cells are organized in thin layers inside and beneath the bark. They also have dead cells in the interior which provide mechanical support

15           (a)

Sunlight is the ultimate source of energy on earth. Green plants converted sunlight in form of sucrose. Animals take food from plants and get energy by oxidation of glucose.

16           (b)

Dough kept overnight in warm weather becomes soft and spongy due to fermentation.

17           (d)

RQ is the ratio of volume of carbon dioxide evolved and volume of oxygen consumed.

18           (a)

On oxidation of fats, maximum amount of energy is liberated.

19           (d)

NADH₂→NAD→NADH₂

NADH₂→FAD→FADH₂

The former operates in liver heart and kidney cells and no energy is spent, while the second operates in muscle and nerve cells and lowers the energy level of 2NADH₂ by 2 ATP molecules

20           (a)                                                                                                                          

Krebs ’cycle involves 8 steps to oxidize 2 molecules of acetyl Co-A produced in transition reaction completely into 4CO₂, 10H₂O, 2ATP, 2FADH₂ and 6NADH+H⁺