Back to your test review

In a C₃ leaf exposed to ¹⁴CO₂, the label passes in the order

(a) 3-PGA → triose phosphate → sugar Correct
(b) sugar → 3-PGA → RuBP Your answer
(c) RuBP → 3-PGA → CO₂ Your answer
(d) OAA → malate → 3-PGA Your answer

Your answer: Correct answer: (a)

Advertisement

Explanation

Why (a) is correct

In a C₃ leaf, ¹⁴C first appears in 3-PGA, then in triose phosphate, and then in sugars.

Why the other options are wrong

(b) · your answer Sugar appears last, not first.
(c) · your answer The label does not go back to CO₂ in this order.
(d) · your answer OAA and malate are C₄ products.

NCERT point: Short ¹⁴CO₂ pulses reveal the order of products.

Thank you! We will check this question.

Practise Photosynthesis in Higher Plants

Take a free 15-question NEET Biology test on this chapter. Timed, scored instantly.

Start free test

Similar questions

Read the statements and choose the correct option.Statement I: In C4 plants, CO2 fixation in the mesophyll and the Calvi… Assertion (A): C4 plants show little or no photorespiration.Reason (R): Decarboxylation of C4 acids raises the CO2 conce… Assertion (A): Mesophyll cells of C4 plants form oxaloacetic acid as the first product.Reason (R): Mesophyll cells of C4…