Explanation:

There are two rain-bearing systems in India.
First originates in the Bay of Bengal causing rainfall over the plains of north India.
Second is the Arabian Sea current of the southwest monsoon which brings rain to the west coast of India

The frequency of the tropical depressions originating from the Bay of Bengal varies from year to year.  Their paths over India are mainly determined by the position of ITCZ which is generally termed as
the monsoon trough. Monsoon Trough is a portion of the ITCZ and is somewhat like a convergence zone between the wind patterns of the southern and northern hemispheres

As the axis of the monsoon trough oscillates, there are fluctuations in the track and direction of these depressions, and the intensity and the amount of rainfall vary from year to year. Hence
statement 1 is correct.
o The rain which comes in spells displays a declining trend from west to east over the west coast, and from the southeast towards the northwest over the North Indian Plain and the northern part of the
Peninsula. Hence statement 2 is correct..