Which alphabet letter is a question?

I am eight letters long - "12345678"
My 1234 is an atmospheric condition.
My 34567 supports a plant.
My 4567 is too appropriate.
My 45 is a friendly thank-you.
My 678 is a man's name.

What word am I?

What number should come in place of the question mark below?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

When monkey rotate the gear, which mark will be hit 1 or 2 ?

1. Where does Easter come from before Valentine's Day?

2. Do you know what is in the middle of Valentine's?

3. What did the lady bee say to the man bee on the occasion of Valentine's Day

What seven-letter word has hundreds of letters in it?

What has a ring but no finger?

Spot what is wrong here in below Picture?

You are in a land where thirty men and two women were dressed in classic black and white dresses.
They begin to fight as soon as any of them move.

Where are you?