QUESTIONS. 305 



3. At what hour does it open its flowers? 



4. How long do they remain open? When do they close? 



5. Do they open and close more than once? 



6. Do the leaves change position at night, or in shade ? 



7. Describe the change. 



8. How is the nectar affected by the flowers' closing? 



3. Irritability. 



1. Is this plant sensitive to touch? In which organ? 



2. How is this indicated ? 



4. Movements. 



1. How is this vine furnished for climbing? 



2. Has it any special organs ? What are they ? 



3. Have you observed their movements ? Describe them. 



4. What seems to be the purpose of this motion ? 



5. After it has reached an object, how does the tendril act? 



6. How does a vine without tendrils climb ? 



7. Is it aided by its petioles ? Explain. 



8. If it be a twining vine, which way does it turn ? 



9. To find a support, what movement have you observed? 

 10. Is it aided by hairs, or prickles ? by rootlets ? 



5. Classification. 



1. Is this plant an Exogen, or an Endogen? 



2. By what marks do you determine this? 



3. Has it a stigma, and an end vessel ? Is it then a Gymnosperm ? 



4. Have you determined its Order ? its Genus ? its Species ? 



