Which one of the following statements are not incorrect?

(i) In over 60% of angiosperms, pollen grains are shed at 3-celled stage.

(ii) It is possible to store pollen grains of a large number of species for years in a liquid nitrogen at -196 O C

(iii) Each pistil has three parts stigma, style and ovary. Stigma serve as a landing platform for pollen grains.

(iv) The style is elongated slender part beneath the stigma. The basal bulged part of the pistil is the ovary.

(v) Arising from the placenta are the microsporangia commonly called ovules.(vi) The body of the ovule fuses with funicle in the region called chalaza.

(vii) Each ovule has one or two protective envelopes called integuments.

(viii) Opposite the micropylar end, is the chalaza, representing the basal part of the ovule.

(ix) Enclosed within the integuments in a mass of cells is called the nucellus.

(x) An ovule generally has a multiple embryo sac formed from a megaspore.

(xi) Ovules generally differentiate into a single megaspore mother cell in the chalazal region.

(xii) The method of embryo sac formation from a single megaspore is termed monosporic development.

Choose the correct option given below: