How does cross-pollination differ from self-pollination?
Cross-pollination moves pollen between two plants of the same species✓Bonne réponse
Cross-pollination moves pollen between plants of different species
Cross-pollination happens inside one flower, self-pollination between flowers
Cross-pollination is done by wind and self-pollination by insects
Explication
The word cross points to two separate individuals, but those individuals still have to be the same kind of plant for the pollen to be of any use when it lands. Reading it as a transfer between different kinds is the usual slip, and pollen from an unrelated species cannot fertilise the ovules of the flower it settles on.