Microprocessor
The reason for the presence of ALE pin in 8085, but not in 6800 is that

 None
 8085 has multiplexed bus, whereas 6800 does not have
 8085 has 5 interrupts lines, whereas 6800 has only two
 8085 uses I/O mapped I/O, whereas 6800 uses memory mapped I/O

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Microprocessor
The output data lines of microprocessor and memories are usually tristated because

 More than one device can transmit over the data bus at the same time
 More than one device can transmit information over the data bus by enabling only one device at a time
 It increases the speed of data transfer over the data bus
 The data line can be multiplexed for both input and output

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