Here's why:

* The nucleus is the control center of the cell, containing DNA. Its primary function is to store and protect genetic information, regulate gene expression, and facilitate cell division.

* Starch and fat are energy storage molecules. They are stored in specialized organelles called:

* Starch: Stored in plastids (specifically amyloplasts) in plant cells.

* Fat: Stored in lipid droplets, which can be found throughout the cytoplasm of both plant and animal cells.

Therefore, the nucleus is not involved in the storage of energy reserves like starch or fat.