What can you see in the middle of March and April that you can never see in any other month?

Rose, Lily and Jasmine decided to buy flowers for their moms on Mother's Day. One of them bought lilies, the other roses, and the third one jasmines.
'It's funny!' said the girl with roses, 'we bought roses, jasmines and lilies, but none of us bought the flowers matching her name'.
'You're right!', said Lily.
What kind of flowers did each of the girls buy?

Take one out and scratch my head, I am now black but once was red. What am I?

The current time can be represented by below textual rebus.

0
=========
B.Sc
LLB

Can you tell us the current time?

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?

What can you catch but never throw?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

Which alphabet letter is a question?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?