appear tefco, apen, and willow troes have drab-colored flowers, with no petals,
ID: 277953 • Letter: A
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appear tefco, apen, and willow troes have drab-colored flowers, with no petals, f that indicate about these troes? before the tree's leaves are out in the spring, and they are dioscios. What does A) Their insect pollinators are probably color blind. B) Early spring birds are probably the pollinators. C) Their pollen is dispersed by wind. D) Flower color or shape is not related to pollinators. 46. Angiosperms are unique in having double feriliration that forms endosperm. What is tue about double fertilization in angiosperms? A) Two sperm combine with a polar nucleus to form endosperm B) Two sperm combine with two eggs to form the zygote and endosperm C) One sperm combines with the polar nuclei to form the zygote, and one sper combines with the egg to form endosperm. D) One sperm combines with the egg to form the zygote, and one sperm combines with the polar nuclei to form endosperm 47. Which of the following structures is mismatched to its function? a. cotyledons / xylem transport to the roots b. male gametes/double fertilization c. endosperm /nutrient storage d. fruit / seed dispersal 48. A fruit is a (an) A) mature ovary with a pericarp. B) hardened seed coat. C) enlarged embryo sac. D) fused carpels. 49. What is the first step in the germination of a seed? A) cell elongation B) fertilization C) imbibition (water up take) D) new mRNA synthesis 50. When seeds germinate, the radicle emerges before the shoot.This allows the seedling to quickly A) obtain a dependable water supply. B) mobilize stored carbohydrates. C) initiate photosynthesis. D) avoid etiolation.Explanation / Answer
45. In cottonwood, aspen, willow trees, the pollen is dispersed by the wind. Ans C
46. Ans D. One sperm combines with the egg to form the zygote and the other sperm fertilizes the polar nucleus to form triploid endosperm.
47. Ans .a) Cotyledons:xylem transport to the roots
Cotyledons are the 1st embryonic leaf in a seed.
48. A fruit is a mature overy with pericarp(wall of a ripened overy).
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