A is true but R is false. Biodegradable substances like food waste or leaves decompose into simpler organic matter, forming compost and replenishing soil. The reason is false, as it mentions inorganic substances instead of organic substances. Assertion is correct.
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Biodegradable substances such as kitchen waste, dead plants, or paper break down naturally by microbes into simpler organic matter. This organic material turns into compost, enriching the soil. The assertion is correct, but the reason wrongly states “inorganic substances” instead of “organic substances.” Hence, the correct option is C. Assertion true but Reason false.