Do you understand the phrases "broken window" and "cooked rice", for instance? In the same way that "cooked rice" means "rice that is / has been cooked", "sealed tender" means "tender that is / has been sealed", and "prescribed form" means "form that is / has been prescribed". However the sentence is not actually correct English.
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GPYIt should say "Sealed tenders on the prescribed form are invited ...".Or, actually, I think "Sealed tenders in the prescribed form" may be what is meant.
zeetec4Lovely dear."dear" is used for loved ones, or people we want to be affectionate towards. It is not appropriate here.