Ganesh, Also, it looks like cabbage plants to me except 2 in the first row and one in the second row look like broccoli... but its all good. the plants look healthy. You may want to just clip on leaves affected as suggested by chinamigarden - sometimes sowing/transplanting can cause few leaves to look like that.

Looks like it did what cauliflower does -- forms a little head that is now "ricey" and overmature. It might or might not have had a happier ending if you had blanched the head as soon as you saw it starting to form. The plant looks great.

It's a cabbage looper. Use Bacillus thuringiensis against them if hand picking isn't practical. Bacillus thuringiensis (BT) is simply a bacteria that likes eating caterpillars. It is sold as Dipel or Thuricide. Here is a link on cabbage loopers

Around here we plant broccoli so it can mature its first head in cool weather. This would be the largest head it would ever produce. If the weather stays cool it may produce side shoots of small heads (florets) after that. Trimming off all flowering shots and severely triming so only a few side shots develop can sometimes help the remaining ones grow larger. Also, some varieties produce more and larger side shots....can't remember what ones they are offhand. I usually just start new plants and go for the initial large heads. Young transplant can be grown from seed in four weeks or so. I can not imagine growing a broccoli plant for 2 years, but you probably cannot imagine living with 2 feet of snow and sub-zero temperatures. I think both places would get the biggest broccoli from young plants, though.