Which of the following statements are not true for microsporogenesis?

(i) The center of each microsporangium occupied by sporogenous tissue.

(ii) The cells of the sporogenous tissue undergo meiotic divisions to form microspore tetrads.

(iii) Each cell of the sporogenous tissue is capable of giving rise to a microspore tetrad.

(iv) Each microspore is a potential pollen or microspore mother cell.

(v) As the anthers mature and dehydrate, the microspores dissociated from each other and develop into pollen grains.

(vi) Inside each microsporangium several thousands of microsporangium several thousands of microspores or pollen grains are formed that are released with the dehiscence of anther.