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19. The secondary xylem and phloem form from
a. cork cambium
b. vascular cambium
c. apical meristems
d. bark

7. A difference between beans and corn during germination is
a. the cotyledons are above ground in the bean plant
b. the corn shoot is hooked to protect it from damage
c. the bean plant cannot germinate until water penetrates the seed coat
d. oxygen is required in the seed before a corn plant can germinate

8. In a woody stem, cork cambium
a. forms phloem by producing sieve tubes
b. forms xylem by producing vessel cells
c. produces the cells of the outer bark
d. becomes vascular cambium


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