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Malus pumila
Yes. Their blossom times will overlap and both produce plenty of good pollen. However, neither need pollination in order to bear fruit; the fruit will just end up seedless.
No It's physicly impossible
It depends on the type of apple tree, some are self pollinating and some need other trees pollen in order to pollinate.
Yes. They are the same species and the same trees. The difference is the grafted on root system. However, the two varieties must have flowering times that overlap, otherwise they will not pollinate.
No, Jonagold is a triploid variety. It cannot be used as a pollinator (and it requires a pollinator).
Any plant can pollinate with any plant. Just so long as there's bees there. Bees accidentally get pollen from other plants on there feet and can ACCIDENTALLY cross-pollinate. So, yes, a pear CAN pollinate with a plum tree.
Flowers attract insects. Insects pollinate the flowers. Pollinated flowers produce seeds. Seeds grow into apples.
it could
yes
no
pine tree