how many of the below statements are right?
​a. both photophosphorylation and oxidative phosphorylation involve uphill transport of protons across the membrane.
​b. in dicot stems, new cambium originates from the 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.                  (AIPMT 2012)

Dear student,     
Please find below the solution to the asked query      
                                                        
Two statements (A and C) are correct. 

Symbiotic nitrogen fixers occur in association with the plant. They are not freely found in soil.

New cambium is not derived from pericycle. It originates from secondary cortex or phelloderm.

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