15. In this diagram of an angiosperm flower, to what structure is the arrow poin
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15. In this diagram of an angiosperm flower, to what structure is the arrow pointing? 16. Seed plants are dominated by the a. sporophyte stage b. gametophyte stage c. pollen stage d. gymnosperms 17. Which of the following statements about endosperm is true? a. Endosperm develops inside the seed. b. Endosperm is found inside pollen grains. c. Endosperm is haploid (2n) d. Endosperm is only produced in male seeds. 18. Which of the following is not a trait that is common to seed plants? a. reduced sporophytes b. reduced gametophytes c. pollen d. heterospory 19. Which type of seed plants appeared in the fossil record first? a. Gymnosperms b. Angiosperms c. Bryophytes d. Algae 20.In 1-2 paragraphs, list the 5 key traits found in nearly all land plants but not green algae. For each trait, please explain how it helped plants adapt to life on land. 1. Alternation of Generations - provided life cycles that alternated diploid, and multicellular haploid stages. Have such a life cycle is beneficial for life on land because it enables better protection of spores and gametes from the harsh environment on land. 2. Multicellular Dependent Embryos-gave rise to multicellular organisms having the between multicellular tain an embryo and produce an offspring inside of the parent. This helps hemExplanation / Answer
15. Ovule.
These are located inside the ovary, the oval structure in the diagram.
16. sporohyte,
The plants produce spores but are never released. They develop into male and female gametophytes. Gymnosperm is a type of spore bearing plant like angiosperms. Gametophyte is the sexual phase of plant and algae life cycle, where the haploid gametes produce diploid zygote.
17. Endosperm develops inside the seed.
The endosperm is a nutritive component of many seeds. This is produced by double fertilization event thus has 3n condition. It is produced in the ovary, not in the pollen grains.
18. Redued sporophyte.
The seed plants dominated by sporophytic life cycle, and it is not reduced. The gametophytic cycle is reduced. The pollen and heterospory ( gametes of different sizes) are common in seed plants.
19. Gymnosperms.
Gymnosperms and angiosperms are the seed bearing plants. Gymnosperms evolved early compared to angiosperms.
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