The fd is not matured but interest is accrued

Yes, you have to book interest income for the period covered up to 31st march 2016 by debiting interest receivable and treat the same as taxable income.

Yes, you need consider the accrued interest in your income.

It is your taxable income.

 Yes , that interest componenet as accrued one but not paid has to be considered, while computing your income , accordingly both  in advance tax  vcalculations and  ITR to be accounted

Genearly It is considered as Other Source income, Taxability depends how method of accounting follow (Accural of cash basis accounting) AS per Section 145 but ssubject to section 2