What does this rebus riddle means ?

Find the missing number in the sequence below:

What can go up a chimney down, but can’t go down a chimney up?

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.

Guess the hidden movie name?

Bay of Bengal is in which state?

Spot 5 differences in two Christmas tree below:

What's the best place to go shopping in the ocean?

A gardener planted the Lemon trees in a mathematical ordered way (i.e. he planted a tree in rows).
He created a total of 19 rows of trees.

Note: There should be more than 2 trees to count as a row.

What is the minimum number of trees required by the gardener to have 19 rows of trees?

A man lives on the fifteenth floor of an apartment building. Every morning he takes the elevator down to the lobby and leaves the building. In the evening, he gets into the elevator, and, if there is someone else in the elevator, or if it was raining that day, he goes back to his floor directly. Otherwise, he goes to the tenth floor and walks up five flights of stairs to his apartment. Can you explain why he does this?