No, PS2 memory cards are keyed differently, and will not physically fit inside the PS machine.
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I do believe that a PlayStation 2 will recognize a PlayStation 1 memory card. I use a ps1 memory card in my ps2 might it might vary from the different memory card brands.
Yes, only for PSone games though. PS2 games require a 8MB (PS2) memory card.
Can't play ps2 games or use ps2 memory cards.
Yes, the memory card for the PS2 can indeed be used in the PS3 also.
Yes, you can use them to save PlayStation 1 games when you play them on the PlayStation 2.