Which of the following is a characteristic of all angiosperms?

Question

BlackTom AI · Accepted Answer

Restating the question and options for clarity:
Question: Which of the following is a characteristic of all angiosperms?
Options:
- a. double internal fertilization
- b. ovules that are not contained within ovaries
- c. carpels that contain microsporangia
- d. complete reliance on wind as the pollinating agent
- e. free-living gametophytes

Now, evaluate each option one by one:
Option a: 'double internal fertilization' — This matches a fundamental and defining feature of angiosperms: double fertilization, where one sperm fertilizes the egg to form a zygote and another sperm fertilizes the polar nuclei to form the endosperm. Fertilization in flowering plants occurs within the ovary, i.e., internally, so this statement is accurate as a characteristic of all angiosperms.

Option b: 'ovules that are not contained within ovaries' — In angiosperms, ovules are located inside ovaries (which later develop into fruits). Saying ovules are not contained within ovaries contradicts the basic structure of angiosperms, making this statement false.

Option c: 'carpels that contain microsporangia' — Microsporangia (pollen sacs) are part of the male reproductive structure (stamens), not the carpels. Carpels contain ovules, not microsporangia. Therefore this option is incorrect.

Option d: 'complete reliance on wind as the pollinating agent' — While some angiosperms are wind-pollinated, many rely on animals (insects, birds, etc.). It is not a universal characteristic of all angiosperms, so this statement is false.

Option e: 'free-living gametophytes' — Angiosperms have highly reduced, dependent gametophytes (female gametophyte within the ovule and male gametophyte within pollen). They are not free-living, which makes this option incorrect.

In summary, each incorrect option contains a misconception about angiosperm biology, while option a correctly identifies a defining trait shared by all angiosperms.

Which of the following is a characteristic of all angiosperms?

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类似问题

Double fertilization in angiosperms results in production of a zygote and the _____.

A pollen tube delivers two sperm to the ovule in order to accomplish double .

One sperm cell fuses with the egg cell while another sperm cell fuses with two nuclei in one of the cells of the female gametophyte in the process of fertilization.

One sperm fuses with an egg to form a zygote, and another sperm fuses with a cell of the female gametophyte with two haploid nuclei in the distinctive angiosperm process known as fertilization.

What is double fertilization?

Which of the following is a characteristic of all angiosperms?

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