Do I still need sd card for nikon d50 if ill be upload the pictures on laptop?

Just wondering?

A D50 doesn't have internal memory, so an SD card is a absolute necessity. For best results, get a couple of good size cards and format them in your camera.

Yes, that is where the image is stored
until you are ready to upload it

With no memory card there won't be any photos.

Is this a joke or trick question? Of course, all cameras take a memory card.