Grade 11 : Biology - Respiration in Plants (Set 2)

Question 1

1. What is the primary site where glycolysis takes place inside a plant cell?

Accepted Answer

B) Cytoplasm

Answer

A) Mitochondrial matrix

Answer

C) Inner mitochondrial membrane

Answer

D) Chloroplast stroma

Question 2

2. Which of the following represents the net gain of ATP molecules directly produced during glycolysis per molecule of glucose?

Accepted Answer

A) 2 ATP

Answer

B) 4 ATP

Answer

C) 36 ATP

Answer

D) 38 ATP

Question 3

3. What is the end product of the glycolytic breakdown of one glucose molecule?

Accepted Answer

C) Pyruvic acid

Answer

A) Acetyl-CoA

Answer

B) Citric acid

Answer

D) Oxaloacetic acid

Question 4

4. In aerobic respiration, the Krebs cycle (TCA cycle) takes place in which cellular location?

Accepted Answer

D) Mitochondrial matrix

Answer

A) Outer mitochondrial membrane

Answer

B) Intermembrane space

Answer

C) Inner mitochondrial membrane

Question 5

5. What is the Respiratory Quotient (RQ) value when carbohydrates are completely oxidized during respiration?

Accepted Answer

C) 1.0

Answer

A) 0.7

Answer

B) 0.9

Answer

D) Greater than 1

Question 6

6. Which enzyme complex catalyzes the oxidative decarboxylation of pyruvic acid to form Acetyl-CoA?

Accepted Answer

A) Pyruvate dehydrogenase

Answer

B) Citrate synthase

Answer

C) Hexokinase

Answer

D) Phosphofructokinase

Question 7

7. Which molecule serves as the ultimate terminal electron acceptor in the mitochondrial electron transport chain?

Accepted Answer

C) Oxygen ($O_2$)

Answer

A) $NAD^+$

Answer

B) FAD

Answer

D) Cytochrome c

Question 8

8. Complex I of the Electron Transport System (ETS) in plant mitochondria is known as:

Accepted Answer

B) NADH dehydrogenase

Answer

A) Succinate dehydrogenase

Answer

C) Cytochrome c oxidase

Answer

D) ATP synthase

Question 9

9. How many carbon atoms are present in a molecule of Oxaloacetic Acid (OAA)?

Accepted Answer

C) 4

Answer

A) 2

Answer

B) 3

Answer

D) 6

Question 10

10. During alcoholic fermentation in yeast, pyruvic acid is converted into ethanol and:

Accepted Answer

B) Carbon dioxide ($CO_2$)

Answer

A) Lactic acid

Answer

C) Oxygen ($O_2$)

Answer

D) Oxaloacetate

Question 11

11. What is the approximate Respiratory Quotient (RQ) value when tripalmitin (a fat) is utilized as a substrate?

Accepted Answer

A) 0.7

Answer

B) 1.0

Answer

C) 1.33

Answer

D) 2.0

Question 12

12. Which small, mobile protein attached to the outer surface of the inner mitochondrial membrane acts as a carrier for electron transfer between Complex III and IV?

Accepted Answer

C) Cytochrome c

Answer

A) Plastocyanin

Answer

B) Ubiquinone

Answer

D) Ferredoxin

Question 13

13. What is the first 6-carbon compound produced in the Krebs cycle by the condensation of acetyl group with oxaloacetic acid?

Accepted Answer

C) Citric acid

Answer

A) Succinic acid

Answer

B) Malic acid

Answer

D) $\alpha$-ketoglutaric acid

Question 14

14. Where is the Electron Transport System (ETS) located within plant mitochondria?

Accepted Answer

C) Inner mitochondrial membrane

Answer

A) Outer membrane

Answer

B) Matrix

Answer

D) Intermembrane space

Question 15

15. The EMP pathway is commonly referred to as which biological process?

Accepted Answer

B) Glycolysis

Answer

A) Krebs cycle

Answer

C) Electron Transport System

Answer

D) Photorespiration

Question 16

16. Which formula correctly defines the Respiratory Quotient (RQ)?

Accepted Answer

B) $	ext{RQ} = \frac{	ext{Volume of } CO_2 	ext{ evolved}}{	ext{Volume of } O_2 	ext{ consumed}}$

Answer

A) $	ext{RQ} = \frac{	ext{Volume of } O_2 	ext{ consumed}}{	ext{Volume of } CO_2 	ext{ evolved}}$

Answer

C) $	ext{RQ} = 	ext{Volume of } CO_2 	ext{ evolved} 	imes 	ext{Volume of } O_2 	ext{ consumed}$

Answer

D) $	ext{RQ} = \frac{	ext{ATP produced}}{	ext{Glucose consumed}}$

Question 17

17. When organic acids such as malic acid are used as respiratory substrates, the RQ value is:

Accepted Answer

C) Greater than 1

Answer

A) Equal to 1

Answer

B) Less than 1

Answer

D) Zero

Question 18

18. Complex IV of the mitochondrial ETS is also known as Cytochrome c oxidase, containing cytochromes:

Accepted Answer

B) a and $a_3$

Answer

A) b and $c_1$

Answer

C) b and d

Answer

D) c and $c_1$

Question 19

19. In glycolysis, substrate-level phosphorylation occurs during the conversion of phosphoenolpyruvate (PEP) to:

Accepted Answer

A) Pyruvate

Answer

B) Glucose-6-phosphate

Answer

C) Fructose-1,6-bisphosphate

Answer

D) 3-phosphoglycerate

Question 20

20. How many molecules of $NADH + H^+$ are generated during glycolysis from one single molecule of glucose?

Accepted Answer

B) 2

Answer

A) 1

Answer

C) 4

Answer

D) 6

Grade 11 : Biology - Respiration in Plants (Set 2)