NEET · Biology · STD 11 - 11. photosynthesis in higher plants

How many ATP and NADPH molecules are required to make one molecule of glucose through the Calvin pathway ?

A 18 ATP and 12 NADPH
B 12 ATP and 18 NADPH
C 24 ATP and 18 NADPH
D 6 ATP and 12 NADPH

Verified Solution

Answer & Solution

Correct Answer

(A) 18 ATP and 12 NADPH

Step-by-step Solution

Detailed explanation

(A) 18 ATP and 12 NADPH
In the Calvin cycle, the fixation of one molecule of \(CO_2\) requires 3 ATP and 2 NADPH molecules.
To synthesize one molecule of glucose, 6 molecules of \(CO_2\) must be fixed.
Total ATP required \(=6 \times 3=18\) ATP.
Total NADPH required \(=6 \times 2=12\) NADPH.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

Match List \(I\) with List \(II\) :

List \(I\)	List \(II\)
\(A\). Oxidative decarboxylation	\(I\). Citrate synthase
\(B\). Glycolysis	\(II\). Pyruvate dehydrogenase
\(C\). Oxidative phosphorylation	\(III\). Electron transport system
\(D\). Tricarboxylic acid cycle	\(IV\). \(EMP\) pathway

Choose the correct answer from the options given below :

NEET 2023 Medium

Explore more questions on app

From NEET

Explore more questions on app

List - I	List - II
(a) Heart	(i) Erythropoietin
(b) Kidney	(ii) Aldosterone
(c) Gastro-intestinal tract	(iii) Atrial natriuretic factor
(d) Adrenal Cortex	(iv) Secretin