112 HOW DO SEED PLANTS SUCCEED IN LIFE? 



seeds is (8). The plants that (9) are those that 



scatter their (10) over a wide (11), grow (12), 



resist dangers of (13) and (14), and attacks of 



(15). 



Summary Outline 



Make an outline, similar to the ones you have used in the previous units. 

 Fill it in for your notebook. Use it to make a summary recitation of the 

 unit. Test your knowledge of the unit by (1) answering and rechecking the 

 survey questions ; (2) performing correctly all assigned exercises ; (3) checking 

 the answers to the various tests with your teacher and correcting all errors. 



Test on Fundamental Concepts 



Make two columns in your notebook, one headed CORRECT and the other INCORRECT. 

 Place the numbers of the statements you think correct and incorrect under their respective 

 columns. Your grade equals correct statements X 4. 



I. Weeds are abundant because (1) animals do not eat them; 

 (2) they produce many and hardy seeds ; (3) they have many devices 

 to scatter seeds ; (4) birds never eat their seeds ; (5) they can live in 

 localities where other plants cannot exist. 



II. Weeds do harm because (6) they occupy the places that other 

 plants might have in our gardens ; (7) they harbor dangerous para- 

 sites; (8) some are poisonous; (9) sheep may eat them; (10) some 

 cause disease, as hay fever. 



III. Weeds may be fought by (11) planting large areas to garden 

 crops ; (12) burning over the infested areas ; (13) plowing them under 

 in the fall; (14) having sheep feed on the infested area; (15) cutting 

 them in the spring and early summer. 



IV. Seeds and fruits are scattered by (16) having fluffy outgrowths 

 which carry them through the air; (17) having hooks or barbs; 

 (18) splitting and letting the seeds out; (19) man; (20) rabbits and 

 chickens. 



V. The most successful plants in the struggle for existence are those 

 which (21) are able to scatter their seeds at a distance; (22) have 

 been introduced where they have no natural enemies, as water cress 

 in Australia; (23) grow faster than others which occupy the same 

 area ; (24) are best fitted to endure unfavorable conditions ; (25) pro- 

 duce few seeds. 



