Read the following four statements (A-D) :
(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 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?
Symbotic nitrogen fixing bacteria -
1. Rhizobium - associated with roots of legume plants
2. Azolla (water fern) - associated with Anabaena azollae
3. Coralloid roots of Cycas -associated with Anabaena and Nostoc
Symbiotic nitrogen fixing bacteria occurs in free living state in association with another organisms(Anaboena,Nostoc, etc). Also in dicot stems , some medullary rays cells become interfascicular cambium.