Read the following four statements (I-IV):
I. | Both, photophosphorylation and oxidative phosphorylation involve uphill transport of protons across the membrane |
II. | In dicot stems, a new cambium originates from cells of pericycle at the time of secondary growth |
III. | Stamens in flowers of Gloriosa and Petunia are polyandrous |
IV. | Symbiotic nitrogen-fixers occur in a free-living state and also in soil |
How many of the above statements are right?
1. Three
2. Four
3. One
4. Two