Answer Key for Sample Lab Practical 1


1. Carboniferous. (Return to Question 1)
2. Many -- the composite family usually has an inflorescence consisting of many ray and tube flowers. (Return to Question 2)
3. No (Return to Question 3)
4. b (Return to Question 4)
5. The flowers of grass plants are wind-pollinated. (Return to Question 5)
6. Female (the round, bulbous part is the ovary) (Return to Question 6)
7. Pollen (Return to Question 7)
8. No, they are the same color as the petals (Return to Question 8)
9. F (nitrogen-fixation occurs in the nodules) (Return to Question 9)

10. No nitrogen-fixation from nodules; low nitrogen means that nitrogen is limiting, and plants need nitrogen for growth (Return to Question 10)
11. Because the relationship with Rhizobium is costly (in terms of energy) to the plants, and not needed when high fertilizer amounts are already supplied in the soil. (Return to Question 11)
No Picture12. F(Return to Question 12)
13. Because soybeans are legumes, and this group of plants can form symbiotic relationships with Nitrogen-fixing bacteria. (Return to Question 13)
14. Because the +L plants have nodules with Nitrogen-fixing Rhizobium bacteria, which means they have a good supply of nitrogen for growth, whereas the -L plants lackRhizobium bacteria and are in low-nitrogen soil.(Return to Question 14)
15. a (Return to Question 15)
No Picture16. Leghemoglobin (Return to Question 16)
17. Intraspecific (Return to Question 17)
18. Interspecific (Return to Question 18)
No Picture19. So you can look at averages. (Return to Question 19)
No Picture20. Seeds (Return to Question 20)
21. F. Plants also compete for water and nutrients. (Return to Question 21)


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Last updated May 8, 1998.