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Ch. 30 - Plant Diversity II: The Evolution of Seed Plants
Campbell - Campbell Biology 11th Edition
Urry11th EditionCampbell BiologyISBN: 9789357423311당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Urry 11th EditionCh. 30 - Plant Diversity II: The Evolution of Seed Plants문제 4
30장, 문제 4

Which of the following is not a characteristic that distinguishes gymnosperms and angiosperms from other plants?
a. Dependent gametophytes
b. Ovules
c. Pollen
d. Alternation of generations

검증된 단계별 안내
1
Understand the key characteristics of gymnosperms and angiosperms. These are seed-producing plants, and they share certain features that distinguish them from other plant groups.
Review the concept of dependent gametophytes. In gymnosperms and angiosperms, the gametophyte generation is reduced and dependent on the sporophyte for nutrition.
Examine the role of ovules. Both gymnosperms and angiosperms have ovules, which develop into seeds after fertilization.
Consider the function of pollen. Pollen is a characteristic of seed plants, including gymnosperms and angiosperms, allowing for the transfer of male gametes to the female ovules.
Understand alternation of generations. This is a life cycle feature present in all plants, not just gymnosperms and angiosperms, involving a switch between haploid gametophyte and diploid sporophyte generations.

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Dependent Gametophytes

In gymnosperms and angiosperms, the gametophyte generation is dependent on the sporophyte for nutrition and support. This contrasts with non-seed plants, where the gametophyte is often independent. Understanding this dependency is crucial for distinguishing seed plants from other plant groups.
추천 영상:
02:37
Density-Dependent Factors

Ovules

Ovules are structures within seed plants where the female gametophytes develop and where fertilization occurs, leading to seed formation. Both gymnosperms and angiosperms possess ovules, which are key to their reproductive processes, setting them apart from non-seed plants.
추천 영상:
06:26
Seed Plants - 1

Alternation of Generations

Alternation of generations is a life cycle pattern where plants alternate between haploid gametophyte and diploid sporophyte generations. This is a characteristic of all plants, not just gymnosperms and angiosperms, making it a non-distinguishing feature in this context.
추천 영상:
04:09
Laminaria Life Cycle: Alternation of Generations
관련 실천
교과서 질문

Use the letters a–d to label where on the phylogenetic tree each of the following derived characters appears.

a. Flowers

b. Embryos

c. Seeds

d. Vascular tissue

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교과서 질문

Gymnosperms and angiosperms have the following in common except

a. Seeds

b. Pollen

c. Ovaries

d. Ovules

2201
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교과서 질문

With respect to angiosperms, which of the following is incorrectly paired with its chromosome count?

a. Egg—n

b. Megaspore—2n

c. Microspore—n

d. Zygote—2n

1345
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교과서 질문

Key features of seed plants facilitating life on land include three of the following four traits. Select the exception.

a. Homospory

b. Pollen

c. Reduced gametophytes

d. Seeds

1454
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교과서 질문

Where in an angiosperm would you find a megasporangium?

a. In the style of a flower

b. Enclosed in the stigma of a flower

c. Within an ovule contained within an ovary of a flower

d. Packed into pollen sacs within the anthers found on a stamen

1354
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교과서 질문

The history of life has been punctuated by several mass extinctions. For example, the impact of a meteorite may have wiped out most of the dinosaurs and many forms of marine life at the end of the Cretaceous period. Fossils indicate that plants were less severely affected by this mass extinction. What adaptations may have enabled plants to withstand this disaster better than animals?

1076
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