Find out the missing number in the picture attached:

What can go through glass without breaking it?

What does the below image rebus riddle means ?

I am quite hot but become too cold if you remove the first two letters. What am I?

I have branches, but no fruit, trunk or leaves. What am I?

What has many keys but can’t open a single lock?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

Which word does the below Plexor means ?

Alex is stranded on an island covered in forest.
One day, when the wind is blowing from the west, lightning strikes the west end of the island and sets fire to the forest. The fire is very violent, burning everything in its path, and without intervention the fire will burn the whole island, killing the man in the process.

There are cliffs around the island, so he cannot jump off.

How can the Alex survive the fire? (There are no buckets or any other means to put out the fire)

Which number should replace the question mark?