Q. The following (I-IV) are the main steps of chemosynthetic ATP synthesis in the light reaction. Arrange them in correct order I. $H^{+}$ concentration gradient established II. $H^{+}$ diffuses through ATP synthetase III. Carriers use energy from electrons to move $H^{+}$ across the membrane IV. Electrons from PS-II pass along electron transport chain V. Light excites electrons in PS-II VI. Energy of $H^{+}$ flow is used by ATP synthetase to make ATP
A) I, II, III, IV, V, IV
B) II, IV, V, III, II, VI
C) V, IV, III, I, II, VI
D) V, VI, III, IV, II, I
Explanation
Steps in chemosynthetic ATP synthesis are (i) Light excites electron in PS-II (ii) Electrons from PS-II pass along electron to move $H^{+}$ across the membranes (iii) Carriers use energy from electrons to move $H^{+}$ across the membrane (iv) $H^{+}$ concentration gradients is established (v) $H^{+}$ diffuses through ATP synthesis (vi) Energy of $H^{+}$ flow is used by ATP synthesis to make ATP
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.