Question

Match List-I with List-II

List-I (Reaction)	List-II (Occurrence)
(A) Dark acidification	(I) Smooth endoplasmic reticulum
(B) Fatty acid synthesis	(II) CAM plants
(C) Hill reaction	(III) Regeneration of RuBP
(D) Rubisco	(IV) Oxygen evolution
(E) Calvin cycle	(V) Photorespiration

Choose the correct answer from the options given below.

• A. (A)-(III), (B)-(II), (C)-(I), (D)-(IV), (E)-(V)
• B. (A)-(I), (B)-(II), (C)-(IV), (D)-(V), (E)-(III)
• C. (A)-(II), (B)-(I), (C)-(IV), (D)-(V), (E)-(III)
• D. (A)-(II), (B)-(IV), (C)-(I), (D)-(III), (E)-(V)

Hint:

Dark acidification is a unique adaptation of CAM plants (like pineapple or cacti) to survive in arid environments by reducing water loss during the day.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept: 
Biochemical pathways and reactions in plant cells are compartmentalized into specific organelles, membrane systems, or physiological plant groups. 

Step 2: Detailed Explanation: 
Let us match the reactions with their occurrence and features: 
- (A) Dark acidification $\rightarrow$ (II) CAM plants: Crassulacean Acid Metabolism (CAM) plants open their stomata at night to fix $\text{CO}_2$ into malic acid, which is stored in vacuoles, causing acidification during the dark. 
- (B) Fatty acid synthesis $\rightarrow$ (I) Smooth endoplasmic reticulum: In general eukaryotic cell biology, lipid synthesis and fatty acid elongation/desaturation occur primarily in the membranes of the smooth endoplasmic reticulum (SER). 
- (C) Hill reaction $\rightarrow$ (IV) Oxygen evolution: The Hill reaction demonstrates that isolated chloroplasts can produce oxygen in the light in the presence of an artificial electron acceptor. 
- (D) Rubisco $\rightarrow$ (V) Photorespiration: The oxygenase activity of the Rubisco enzyme fixes $\text{O}_2$ instead of $\text{CO}_2$, initiating the photorespiratory cycle ($\text{C}_2$ cycle). 
- (E) Calvin cycle $\rightarrow$ (III) Regeneration of RuBP: The third and final phase of the Calvin-Benson ($\text{C}_3$) cycle involves regenerating the primary $\text{CO}_2$ acceptor, ribulose-1,5-bisphosphate (RuBP). 
This matches Option (C). 

Step 3: Final Answer: 
The matching corresponds to Option (C).