Can you replace the question mark with the correct number in the below table sequence?

Identify the hidden meaning behind this picture?

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

When does a USA Potato change its nationality?

Which Travels Faster? Solve below famous picture riddle:

You can find some missing letters in the picture. By placing two particular letters in the spaces, you can form a nine lettered word beginning from one of the corners and going clockwise direction to the middle. Can you find out the letters and the word?

Replace the question mark with the correct number below.

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?