NEET Biology question
Read the following four statements (A-D) and determine how many are correct. (A) Both photophosphorylation and oxidative phosphorylation involve uphill transport of protons across the membrane. (B) In dicot stems, a new cambium originates from cells of the pericycle at the time of secondary growth. (C) Stamens in flowers of Gloriosa and Petunia are polyandrous. (D) Symbiotic nitrogen fixers occur in a free-living state also in soil.
Solution
(A) is correct — both processes pump protons against their concentration gradient (uphill) using ETC-derived energy. (B) is incorrect — in dicot secondary growth, part of the new (interfascicular) cambium does arise from pericycle/medullary ray cells, but this statement in isolation is usually judged false/imprecise
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