What are these (eggs?) ? ( Location - India )
The group of insects called Neuropterans have several species that lay eggs on stalks. This group includes lacewings, owlflies and antlions, however stalked eggs are not a defining trait of the group. In addition to the Green lacewing, the Blue-eyed lacewing from Australia lays stalked eggs while owlflies do not. Mantidflies also have stalked eggs which are members of the Neuroptera order, but the stalks are relatively short compared to lacewings.

This thread provides some interesting discussion.

P.S. While not an arthropod, at least one Genus of Molluscs (Nucella), lay stalked eggs too.  

These are certainly eggs from this order (Neuroptera). Incubation time for these type of eggs can be anywhere from 2-7 days so you may already be having hatching if there are less eggs than what was initially there.