Resource Mobilization — Entrepreneurship STD 11 Commerce — Question

A debenture is a written instrument acknowledging a debt and containing provisions as regards the repayment of principal amount and the payment of interest at a fixed rate.
Thus, a certificate or a document issued by a company under its seal as an acknowledgement of it debt to be repaid back after the expiry of said period is a debenture. It's a long term arrangement of raising funds from outside.