Question

why a bread becomes porous and spongy

Answer 1

it becomes so due continues fermentation and accumulation of carbon dioxide

Answer 2

A breath becomes porous and spongy because when the dough Rises up due to the production of CO2 bubbles by the yeast , the carbon dioxide gas escapes forming holes or pores in the bread and thus making it spongy.

HOPE IT HELPS YOU.
PLEASE HIT THANKS AND MARK BRAINLIEST.