Within a gymnosperm megasporangium, what is the correct sequence in which the following should appear during development, assuming that fertilization occurs?
1. sporophyte embryo
2. female gametophyte
3. egg cell
4. megaspore
A) 4 ? 3 ? 2 ? 1
B) 4 ? 2 ? 3 ? 1
C) 4 ? 1 ? 2 ? 3
D) 1 ? 4 ? 3 ? 2
E) 1 ? 4 ? 2 ? 3
Answer: B
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Biology
- Angiosperms are the most successful terrestrial plants. Which of the following features is unique to them and helps account for their success?
- Which of the following flower parts develops into the pulp of a fleshy fruit?
- Which of the following flower parts develops into a seed?
- Hypothetically, one of the major benefits of double fertilization in angiosperms is to
- Which structure(s) must pass through the micropyle for successful fertilization to occur in angiosperms?
- Arrange the following structures from largest to smallest, assuming that they belong to two generations of the same angiosperm. 1. ovary 2. ovule 3. egg 4. carpel 5. embryo sac
- How have fruits contributed to the success of angiosperms?
- Among plants known as legumes (beans, peas, alfalfa, clover, etc.) the seeds are contained in a fruit that is itself called a legume, better known as a pod. Upon opening such pods, it is commonly observed that some ovules have become mature seeds, whereas other ovules have not. Thus, which of the following statements is (are) true? 1. The flowers that gave rise to such pods were not pollinated. 2. Pollen tubes did not enter all of the ovules in such pods. 3. There was apparently not enough endosperm to distribute to all of the ovules in such pods. 4. The ovules that failed to develop into seeds were derived from sterile floral parts. 5. Fruit can develop, even if all ovules within have not been fertilized.
- Angiosperm double fertilization is so-called because it features the formation of
- The generative cell of male angiosperm gametophytes is haploid. This cell divides to produce two haploid sperm cells. What type of cell division does the generative cell undergo to produce these sperm cells?
- Which of the following is a true statement about angiosperm carpels?
- Carpels and stamens are
- Which of the following statements is true of monocots?
- Which of the following are structures of angiosperm gametophytes?
- The seeds of orchids are among the smallest known, with virtually no endosperm and with miniscule seed leaves. Consequently, what should one expect to be true of such seeds?
- What adaptations should one expect of the seed coats of angiosperm species whose seeds are dispersed by frugivorous (fruit-eating) animals, as opposed to angiosperm species whose seeds are dispersed by other means? 1. The exterior of the seed coat should have barbs or hooks. 2. The seed coat should contain secondary compounds that irritate the lining of the animal's mouth. 3. The seed coat should be able to withstand low pH's. 4. The seed coat, upon its complete digestion, should provide vitamins or nutrients to animals. 5. The seed coat should be resistant to the animals' digestive enzymes.
- Which of the following is true concerning flowering plants?
- Which of the following is a characteristic of all angiosperms?
- Given the differences between angiosperms and gymnosperms in the development of the integument(s), which of these statements is the most logical consequence?
- Which of the following sex and generation combinations most directly produces the fruit?
- Which of the following sex and generation combinations most directly produces the megasporangium of pine ovules?
- Which of the following sex and generation combinations most directly produces the pollen tube?
- Which of the following sex and generation combinations most directly produces the integument of a pine seed?
- Reptilian embryos are protected from desiccation by a leathery shell. Similarly, which pair of structures protects seed plants' embryos and male gametophytes, respectively, from desiccation?
- What is true of stamens, sepals, petals, carpels, and pinecone scales?
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