Explanation

Under the 1956 Constitution, Parliament was unicameral (one House).

Legislative powers vested in the Parliament,

which consisted of the President and the National Assembly comprising 300 Members

divided equally between East and West Pakistan.

The cabinet was presided over by the Prime Minister.

The Constitution declared that there would be only one house of parliament known as the National Assembly.

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History
Parliament has __01__ House in the 1956 constitution.
Parliament has __01__ House in 1962 constitution.

Parliament has __02__ House in 1973 constitution.