How is a banana a berry but a strawberry isn't?

Eleven-year-old Arshiya's sent us this week's Big Question.

She wants to know how a banana is a berry but a strawberry isn't?

Well at first here at Newsround HQ we thought that sounded a bit, well, bananas.

But we like a challenge so we're grape-ful Arshiya sent us this one!

We've had some help from Gemma who's a botanist to find out if this is true and why. She works at Kew Gardens which is home to all sorts of plants, including banana plants.

If you've got your own Big Question you would like us to answer get in touch!.