Answer Posted / smarty

Sudheer has given good explaination,just to add on it :-
1)I2C is half duplex as there are only two lines(SCL and
SDA).
2)SPI is Full Duplex as between a Master and a dedicated
slave as selected by slave_select signal; there are 4 lines
(Spi_clk,Spi_datain,Spi_dataout and slave_select).So,at any
given time data can be sent and received by the master on
two seperate lines.

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