NEET Previous Year Question

Read the following four statements (A to D):
(A) Both, photophosphorylation and oxidative phosphorylation involves the uphill transport of protons across the membrane.
(B) In dicot stems, a new cambium originates from the cells of pericycle at the time of secondary growth.
(C) Stamens in flowers of Gloriosa and Petunia are polyandrous.
(D) Symbiotic nitrogen-fixers occur in free-living state also in soil.
How many of the above statements are right?

Topic: NEET PYQ

Answer: D. Full step-by-step solution below.