What plants are these? Fruit trees possibly?

Hello all, hope you are enjoying the weather.
I have some plants that im hoping are lemon or apple trees, can anyone confirm this? I planted them from seed out of fruit that I ate but am having trouble identifying which is which. Also is there any special care I need to give these? greenhouse? Keep indoors over winter?





Thanks

Second picture, plant on the right looks like Rowan. 

I'm not saying it is, but it looks like it to me. Its a tree and you can use its berries.

Info here:

http://www.treesforlife.org.uk/tfl.rowan.html

Thanks for the replies
I think they could be grapefruit, lemon, apple, orange, pear, or grape. I have a small plastic tub in the kitchen and whenever some fruit is eaten if it has seeds in it then I extract them and put them in the box. I then just threw them in damp soil in the conservatory and left them be with a little watering now and then. The only confusing thing is I didnt eat any rowan berries or plant any rowan seeds but am using used compost which is from a garden nursery.

Also incase your wondering in the top of the first picture the cactus type plants are dragon fruit grown from seed taken out of store bought dragon fruit