Fruit ripeness, seasonality, storage, safety, nutrition and practical signs of quality.
Apple seeds contain amygdalin, which can release cyanide when chewed or crushed, but accidentally swallowing a few whole seeds is generally not a problem. — they are not a food to eat on purpose.
Accidentally swallowing one whole cherry pit is usually low risk because the hard shell keeps the seed enclosed. — Risk rises if the pit is cracked, chewed or ground because the kernel contains amygdalin.
In essence: cut watermelon is best used within about 3–4 days in the refrigerator.
Put simply: an avocado is a fruit in botanical terms.
In short: a banana is a berry in botanical terms.
The key point: a strawberry is not a true berry in botanical terms.
A few localized brown or soft pomegranate arils may be removable if surrounding chambers are sound. Widespread wet browning, blackened arils, mold or musty odor means discard.
Pomegranate heart rot can blacken arils internally while the rind looks only slightly abnormal. Fuzzy growth, black masses, musty odor or extensive wet decay mean discard.
White material on dates is often crystallized natural sugar. Dry gritty crystals are a quality change; fuzzy growth, dampness, musty or sour odor point toward mold or fermentation.
USDA recognizes visible sugar crystals on raisins as “sugaring.” Dry gritty white crystals differ from fuzzy mold, especially when mold is accompanied by dampness or musty odor.
Fresh figs are naturally soft and juicy, but alcohol, vinegar, fizz, cloudy leakage, watery brown collapse or mold point to souring and decay rather than normal ripeness.
Loose melon seeds can accompany ripeness, but a slimy or ropy seed cavity, cloudy liquid, fermented odor, mold or broad tissue collapse signals spoilage.