Cross Pollination

[RenettaHogan]

My hydroponic system is inside. My question for you experts out there concerns cross pollination. Do tomatoes, cucumber and green chile need to be cross pollinated? Are there certain plants that don't need to be cross pollinated? If so, what types are they? If not, how do you deal with cross pollinating? I'm determined to learn all I can about this process and would like some advice from the experts. Thank you!