Are there any, or is the plant happy, as long as it reproduces?
I know there are receptors on the flower/ "she-part" of the plant, so the plant don’t get pollinated by another species, but is there any way for the plant to "know" if the pollon carrys good/bad genes?
Are the same kind of receptores involved?
plants don’t have anything like that either. At least I don’t know about anything. Also, how would you like to sense such things? Moreover, plants usually produce much more seeds, so if some gets wrong, it doesn’t matter so much 😉
giving it some thought i think it’s not nessicary eighter (at least not in general). The fact the a plant is able to get an insect to pollinate it, or are succesfull in pollinating another flower automaticly will increase selection for good genes by survival of the fittest.
Do you know there is a word "Incompatibility" for crossing plants. Plants are able to "select" the other plant through this mechanism. If you find more information in this part, you will find another term on "S haplotypes". This are the alleles that control the mechanism whether 2 plants are able to cross and produce fertile progeny. For those incompatible, the pollen (male determinant) that fall on stigma (female determinant) will not germinate; pollen tube will not form; fertilization will not occur, etc…
I will suggest you to read through "incompatibility" and "Self-incompatibility" for more information and detail.