3 questions on "Introduction to IP Multicasting - IGMPv1 and IGMPv2 Interoperability"

How can a IGMPv2 host determine if there are IGMPv1 routers present on the LAN?
IGMPv1 routers send queries with MRT 0
IGMPv2 routers send queries with MRT with a value of nonzero
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How can a IGMPv2 router determine if there are IGMPv1 hosts present on the LAN?
IGMPv1 hosts send Report messages type 0x12 and
IGMPv2 hosts send Report messages type 0x16
IGMPv3 hosts send Report messages type 0x22
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Why does an IGMPv2 router ignore leave message if there is a IGMPv1 host?
IGMPv1 does not understand leave messages

If an IGMPv2 host send a leave message, an IGMPv2 router conclude that there no more recievers because IGMPv1 host does not understand a group specific member query message.
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