what does the below math rebus puzzle mean?

Which of the below owl is odd one out?

Before Mount Everest was discovered, what was the highest mountain in the world?

John is the son of Jacob.
So,
Jacob is the_____of John's father?

If EELS + MARK + BEST + WARY = EASY

What does HELP + BARK + WARD + LEAD equal?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

An exterior architect is asked by a builder to plant seven trees in a manner that there are exactly six rows of trees in a straight line and each row has three trees in particular.

How will he do it?

In the picture given below, can you find out which digit will take place of the question mark?

Find The Odd One Out

1. FLOW
2. SNIP
3. TRAP
4. DRAW
5. BACK