Can you find the missing piece of the Porsche?

There was a kingdom in which the king had no heir to take over his thrown. Even the queen was dead and he himself was on the verge of dying. He thought about it and then summoned all of the teenagers. He gave one seed each to all of them and asked them to grow the plant. He announced that the one with the most beautiful plant will become the king/queen of the empire after the death of the king.

After a month, all of them were called. The king looked at all of the plants but announced the girl with an empty pot as the queen of the empire. Why?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

A man is found dead with a knife in his back When the investigation is done. A chair lays beside him and the forensic team finds moisture around the body.

If he committed suicide, how did he do it?

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

What demands an answer, but asks no questions

In one of the popular batman series movie "Batman Forever", there was a riddle that goes like "Tear me off and then scratch my head and I was red then and now I am back. Who am I?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?