Dear student,
The answers are,
(i) Chloroplast, since the food is produced in it.
(ii) Endoplasmic reticulum- since the substance are transported through it
(iii) Lysosomes- since if it releases its enzymes in the cell, the cell can die
(iv) Energy currency-Since the energy is stored in the form of ATP
(v) Nucleus-since it contains DNA which controls all the mechanisms and the working of cell.
Regards