Answer:
I am the only word that looks the same when spelled upside down.
What word has kst in the middle, in the beginning, and at the end?
In spring, I am gay in handsome array. In summer, more clothing I wear. When colder it grows, I fling off my clothes. In winter, quite naked appear. What am I?
I take off my clothes when you put on your clothes. I put on my clothes when you take off your clothes. What am I?
I have no voice but I can teach you all there is to know. I have spines and hinges but I am not a door. Once I've told you all, I cannot tell you more. What am I?
Give it food and it will live, give it water and it will die.