Which statements are correct for anemophily?

(i) Pollen grains coming in contact with the stigma is a chance factor in both wind and water pollination.

(ii) Pollination by wind is more common amongst biotic pollinations.

(iii) Wind pollination also requires that the pollen grains are light and non-sticky.

(iv) The often possess well-exposed stamens and large often-feathery stigma.

(v) Wind pollinate flowers often have a single ovule in each ovary and numerous flowers packed into ah inflorescence.

(vi) Wind pollination is uncommon in grasses.