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The one that runs under the washer was probably stubbed in and was going to be used as the washer's waste line out. It is a little small for this and a good thing they put in a sink and added the washer's line to that waste line.
The other one maybe some sort of vent line. IT IS A BIG no no. Basically you have an open line that comes out of the houses main sewer line and is un capped in your basement? You need to deal with that soon, it could be providing you with sewer gas into the house. You could do a couple things...
Cap it-really easy-read the line size on the side of the pipe-go to hardware store buy cap and glue and then glue it on the end.
Bag it-take a rubber band and really strong plastic bag that seals and place the bag over the end and rubber band it down.
Put a charcoal filter on it-this will prevent gas from coming into the house-similar to capping but you have to find the correct size filter or pipe adaptors and put it on the end of it.
Run it outside-or into a vent line.
It is a problem. You do not want sewer line gas coming up into the house.
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