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Chapter 26: Q. 17 (page 697)
Abundant and powdery pollen produced by small, indistinct flowers is probably transported by:
a. bees and butterflies
b. flies
c. birds
d. wind
The correct option is (d) wind.
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Which of the following traits characterizes gymnosperms?
a. The plants carry exposed seeds on modified leaves.
b. Reproductive structures are located in a flower.
c. After fertilization, the ovary thickens and forms a fruit.
d. The gametophyte is the longest phase of the life cycle.
At what stage does the diploid zygote form?
a. when the female cone begins to bud from the tree
b. at fertilization
c. when the seeds drop from the tree
d. when the pollen tube begins to grow
What role did the adaptations of seed and pollen play in the development and expansion of seed plants?
Seed plants are ________.
a. all homosporous
b. mostly homosporous with some heterosporous
c. mostly heterosporous with some homosporous
d. all heterosporous
In the northern forests of Siberia, a tall tree is most likely a:
a. conifer
b. cycad
c. Ginkgo biloba
d. gnetophyte
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