Gnawing c. Piercing, sucking d. Rasping 26. A pH meter is commonly used to test for'. Soil contamination 27. Heading back d. What is the difference between a tuber and a corm'.
Tubers are modified roots.
None of the above 30. All of the above 31. The grass has been killed in a heavily traveled area. Salt and oil from people's shoes 32. Ideally by spacing, lawn sprinkler systems are installed so that they provide ever coverage.