92 



PLANT BIOLOGY 



Is the fruit hard or soft ? Draw in the position 

 on which it hung on the tree ( X 2) the fruit that 

 is given you. Label main fruit-stalk, wing- 

 like attachment, single fruit stalk, fruit. 

 b. c. d. Answer questions given under 1 (above). 

 3. The elm fruit or ailanthus fruit. 



a. Notice the fruit stalk, the single-celled ovary, the 



wing about the ovary. 



Draw ( X 2) one of the above-named fruits. Label 

 fruit-stalk, ovary, wing. 



b. c. d. Answer questions given under 1 above. 



B. Tufted fruits (or seeds) . 



1. The clematis, dandelion, thistle, or aster fruit. 



a. Find the tiny seed-like ovary, containing a single 



seed, and the tuft of hair. Draw ( X 2) one of 

 the fruits. Label ovary, tufts of hair. 



b. c. d. Answer questions under A, above. 



2. The milkweed fruit and seed. 



a. (Optional.) Study Fig. 36. Describe the way the pod 



opens when it is ripe. Are the seeds many or few ? 

 Draw one of the fruits (pods) to show the method of 



opening. Label fruit-stalk, 

 ovary, seeds, style. 



b. Examine one of the seeds 



that has been detached 

 from the pod. Draw 

 (X2) one of the seeds 

 with its tuft of hair. 

 Label seed, tuft of hair. 



c. Drop one of the tufted 



seeds out of an open win- 

 dow when a breeze is 

 blowing or fan a seed 

 in the laboratory. State 

 your observation. What 



FIG. 36. Milkweed pod is One US6 of the tuft of 



opening. hair ? 



