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Respiration in Plants

 1. Respiratory substrates are the organic substances , which are…………..during 

respiration to liberate energy

 (1) Oxidised (2) Reduced

 (3) Synthesised (4) both 1 and 2


2. Which of the following statement is true for the given equation?

(1) pyruvic acid is oxidatively 

decarboxylated to form acetyl CoA

(2) it needs a multienzyme complex

(3) 5 essential cofactors required are lipoic acid, CoA, NAD, TPP and Mg2+

(4) all of the above


3. Lactic acid formation can be observed in 

(1) Pea seeds (2) Muscle cells

(3) Cereal seeds (4) Groundnut



4. FAD is electron acceptor during oxidation 

of which of the following?

(1) a-ketoglutarate Succinyl Co-A

(2) Succinic acid Fumaric acid

(3) Succinyl Co-A Succinic acid

(4) Fumaric acid Malic acid



5. The released energy obtained by oxidation is stored as

(1) A concentration gradient across a 

membrane

(2) ADP

(3) ATP

(4) NAD+


6. Acetaldehyde is intermediate product in 

(1) lactic acid fermentation

(2) ethyl alcohol fermentation

(3) Kreb’s cycle

(4) glycolysis


7. Out of the following, which is the rate 

limiting enzyme in glycolysis

(1) Pyruvate kinase

(2) Phosphofructo kinase

(3) Phosphoglucoisomerase

(4) Gluco kinase


8. Which of the metabolites is common to respiration-mediated breakdown of fatty acid carbohydrates and proteins?

(1) Pyruvic acid

(2) Acetyl CoA

(3) Glucose-6-phosphate

(4) Fructose 1,6-bisphosphate


9. What is the net ATP molecules gain, when 4 molecules of glucose undergo anaerobic respiration in plants?

(1) 8 ATP       (2) 20 ATP

(3) 144 ATP   (4) 16 ATP


10. How much percentage of energy is released during lactic acid and alcoholic fermentation?

(1) 10   (2) 15

(3) 45   (4) Less than 7


11. When oxygen is not available to a muscle cell, NADH formed during glycolysis does not pass electrons to the ETS. Instead, it passes hydrogen atoms to

(1)Acetyl CoA     (2) Pyruvic acid

(3)Fructose.        (4) ADP



12. In an anaerobic condition, yeast cells breakdown glucose to

(1)CO2+ H2O 

(2) C2H5OH and CO2

(3)CO2 H5OH and CO2

(4)CO2+ Pyruvic acid



13. In alcoholic fermentation.

(1)CH3CHO reoxidises NADH2

(2)CH3CHO reduces NADH2

(3)NADH2 oxidises CH3CHO

(4)CO2 is not released



14. In alcoholic fermentation

(1)Oxygen is the electron acceptor

(2)Triose phosphate is the electron donor while acetaldehyde is the electron acceptor

(3) Triose phosphate is the electron

donor while pyruvic acid is the electron acceptor

(4)There is no electron donor



15. In alcoholic fermentation, NAD+is

regenerated during

(1)Reduction of acetaldehyde to ethanol

(2)Oxidation of glucose

(3)Oxidation of pyruvate to acetyl CoA

(4)Hydrolysis of ATP to ADP


16. All enzymes of TCA cycle are located in the mitochondrial matrix except one which is located in inner mitochondrial

membranes in eukaryotes and in cytosol in prokaryotes. This enzyme is

(1)Lactate dehydrogenase

(2) Isocitrate dehydrogenase

(3) Malate dehydrogenase

(4) Succinate dehydrogenase



17. The overall goal of glycolysis, Krebs cycle and the electron transport system in the formation of

(1) ATP in small stepwise units

(2) ATP in one large oxidation reaction

(3) Sugars

(4) Nucleic acids


18. Which of the following is biological

uncoupler of oxidative phosphorylation?

(1) 2, 4 dichlorophenoxylacetic acid

(2) keratin

(3) thermogenin

(4) 2, 4 trinitrophenol


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