<p> Name(s)______Date______Period______</p><p>Grasshopper & Crayfish: Lab Questions/ Data sheet</p><p>Part I: Grasshopper data</p><p>1. List the main characteristics that define the Insecta class.</p><p>2. What are the stages of incomplete metamorphosis in the grasshopper?</p><p>3. How much does the nymph differ from the adult grasshopper?</p><p>4. What is the function of the labrum?</p><p>5. How are the mandibles adapted for crushing blades of grass?</p><p>6. How are the maxillae adapted for holding and cutting food?</p><p>7. What is the function of the labium?</p><p>8. How do the palpi of the maxillae and the labium function in feeding?</p><p>9. What is the function of the gastric caecum?</p><p>10. What is the function of the malphigian tubules?</p><p>11. Describe how the grasshopper’s circulatory system works. 12. Write some notes about your overall reaction to this dissection: what interested/surprised you? What did you learn the most/best from this dissection experience, as opposed to looking at illustrations?</p><p>Part II: Crayfish data</p><p>1. How many segments are on the abdomen? _____ How many pieces make up the carapace? _____</p><p>2. Where are the large compound eyes in relation to the rostrum? </p><p>3. Description: structure of the antennules and antennae.</p><p>4. Description: mouth part movements</p><p>5. Comparison: maxillipeds, chelipeds and walking legs</p><p>6. Sex of crayfish. ______</p><p>7. What is this structure and what is it used for? </p><p>8. Description: gonads, heart, and stomach</p><p>9. Observation: intestine and muscles</p><p>10. Describe the crayfish eye. What do you notice different about this structure? 11. </p><p>Major Appendages on a Crayfish Appendage Location Function</p>