# Assessment 9 #### What is the PRIMARY advantage of combining blockchain with existing IoT sensors rather than replacing them? * [ ] Blockchain makes sensors more accurate * [x] Blockchain adds verifiability and traceability to sensor data while preserving sensor functionality * [ ] Blockchain eliminates the need for sensor calibration * [ ] Blockchain makes sensors wireless **Notes to Learners** Blockchain doesn't change sensor accuracy (A is false), replace calibration needs (C is false), or affect connectivity (D is false). What blockchain does is add a **layer of verification and immutability** to existing sensor data. Your soil moisture sensor still measures soil moisture with the same accuracy. But now that measurement is **timestamped**, **signed**, and **recorded in a tamper-proof ledger**. This enables you to prove to insurers, certifiers, or buyers that your data is accurate and unaltered. You **keep the precision ag investment** and **gain verification layer**. This is why Brix and Columns' weather station didn't need replacement—blockchain enhanced the data it already provided. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://hub.bsvblockchain.org/higher-learning/bsv-academy/the-business-case-for-blockchain-in-agriculture/blockchain-+-precision-agriculture-better-together/assessment-9.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.