Answer:
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.
Round as an apple, deep as a cup, and all the kings' horses can't fill it up. What is it?
What is it that given one, you’ll have either two or none?
Something wholly unreal, yet seems real to I. Think my friend, tell me where does it lie?
I count time, but have no end. Tick tick, but I am not a clock. What am I?
What did the piece of wood say when he saw the screwdriver and screws approaching?