Here's why:
* The vowel sound in "biscuit" is a short "i" sound. It sounds like the "i" in "bit" or "sit".
* Long vowel sounds are typically represented by a single vowel followed by a silent "e" at the end of a word (like "bike", "hope", "cute"). This is not the case with "biscuit."
Therefore, "biscuit" has a short vowel sound.