What does the following BrainBat signifies?

ABCDEFGHIJKLMNOPQRSTUVWYZ

QQQQQQQQQQQQQQQQQQQQQQQQQ.

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

1 rabbit saw 9 elephants while going to the river. Every elephant saw 3 monkeys going toward the river. Each monkey had 1 parrot in each hand. How many animals are going towards the river?

Samuel was out for a walk when it started to rain. He did not have an umbrella and he wasn't wearing a hat. His clothes were soaked, yet not a single hair on his head got wet. How could this happen?

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

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

Give it food and it will live; give it water and it will die.

What has many keys but can’t open a single lock?

It is an eleven letter word.
The first, second, third and fourth letters form a banquet's name.
The fifth, sixth and seventh letters form a car's name.
The eighth, ninth, tenth and eleventh letters form a mode of transport.

Can you identify what word it is?