366 Home Nature-Study Course. 



Seeds used for food and then carried by squirrels and Nuts Berries 



other animals. Grains. 



Burdock 

 Seeds that attach themselves to animals and to Stick-tights, 



clothing. Pitch-forks 



Clot-bur 



Questions. 



1. Why have plants developed devices for scattering seeds? 



2. What is the utility of the flower? 



3. Describe or picture the poppy pod, showing by drawing or 

 description how the seeds are scattered.- 



4. Show by drawing or description the development of the dande- 

 lion seed in the flower. 



5. What is pappus and where does it grow in the flower? 



6. Describe the pappus of the flower of the thistle, and also as it 

 looks when it is carrying the seed. Notice that each division of the 

 pappus has fringes along its sides. Show by sketch the difference 

 between the dandelion balloon and the thistle balloon. 



7. Show by description or by picture the arrangement of the seeds 

 in the milkweed pod, and the position of the silk which later makes 

 the balloon. Is this silk pappus? 



8. What other seeds do you know that sail by balloons? 



9. If you have ever burst a pod of the touch-me-not or jewel weed, 

 tell how it scatters its seeds. 



10. What is the mechanism by which the witch hazel throws its 

 seeds for several yards? 



11. Sketch or describe some seeds with wings. Describe the 

 texture and venation of the wings. 



12. Do you know of any winged seeds that grow on low plants? 



13. Why is the winged seed's shape adapted to the needs of the 

 tree? 



14. What plants do you find being blown about the bare fields in 

 November or later in the winter? 



15. Make an experiment by taking a pan of water and placing 

 upon it the seeds of milkweed, thistle, willow and cat tail, and note 

 how long these seeds mil float before they sink. 



16. Which of the above named seeds would be hkely to be planted 

 by the water, supposing they floated upon it? 



17. Make a cross-section of a cranberry and draw or describe the 

 interior and explain how it floats. 



18. What birds are most active in scattering the seeds of berries? 



