Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 39.4, Problem 6CC
Summary Introduction
To predict: The absence of predictable leaf abscission in desert ocotillo.
Introduction: Leaf abscission refers to the natural or unnatural falling of the leaves from the plant after they have been detached from the rest of the plant body. The growth hormone responsible for leaf abscission is abscisic acid.
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Which of the following is correct regarding female gametophyte development in
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production of seeds
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Chapter 39 Solutions
Biology
Ch. 39.2 - Describe the direction of water movement when a...Ch. 39.3 - Prob. 1CSCh. 39.4 - Prob. 1CSCh. 39.4 - Prob. 1CCCh. 39.4 - Prob. 2CCCh. 39.4 - Prob. 3CCCh. 39.4 - Prob. 4CCCh. 39.4 - Prob. 5CCCh. 39.4 - Prob. 1EQCh. 39.4 - Prob. 2EQ
Ch. 39.4 - Prob. 6CCCh. 39.4 - Core Skill: Connections Look back to Figure 36.16,...Ch. 39 - Prob. 1TYCh. 39 - Prob. 2TYCh. 39 - Prob. 3TYCh. 39 - Prob. 4TYCh. 39 - Prob. 5TYCh. 39 - Which of the following statements best explains...Ch. 39 - What features of water explain how it can be drawn...Ch. 39 - Prob. 8TYCh. 39 - Prob. 9TYCh. 39 - Prob. 10TYCh. 39 - Prob. 1CQCh. 39 - Prob. 2CQCh. 39 - Prob. 3CQCh. 39 - Prob. 1COQCh. 39 - Prob. 2COQ
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- In an angiosperm life cycle, sexual reproduction includes: meiosis within the male gametophyte to produce sperm. meiosis within the female gametophyte to produce eggs. meiosis within the ovary to produce megaspores. fertilization leading to development of microspores. fertilization leading to development of megaspores.arrow_forwardWhich of the following traits are unique to Angiosperms? Heterosporous Pollen tube growth Dominant sporophyte Triploid tissue present in the seedsarrow_forwardMost of the approximately 900 species of gymnosperms are conebearing plants. On the surfaces of their cone scales are ovules, which later become seeds. These ovules are said to be naked because they are not completely enclosed by diploid tissue (as the ovules of angiosperms are). This characteristic gives the gymnosperms their name; gymnos is a Greek word meaning naked, and sperma means seed. Botanists now divide the gymnosperms into four groups: conifers, cycads, ginkgos, and gnetophytes.arrow_forward
- A slight change in a plant species’ flower structure might favor a different pollinator. How might such a change in flower structure lead to a new plant species? How does coevolution between flowering plants and animal pollinators help explain the huge diversity of angiosperms?arrow_forwardWhat is a key adaptation of Gymnosperms which helps make them successful on land? male gametophytes that are found within mobile sporophyte tissue O leaves modified to attract pollinators double fertilization an ovary that develops into a fruit that aids in seed dispersal All of these contributed to the success of the Angiospermsarrow_forwardExplain, the differences between plant generations, include: 1) how can you tell which is dominant 2) gametophyte vs sporophyte 3) haploid vs diploid 4) examples from both gymnosperms and angiospermsarrow_forward
- What is the genetic load in angiosperms and gymnosperms of the following structures: Microsporophyll Microsporangium Microsporocyte Microspora Microgametophyte Megasporophilic Megasporangium Megasporocyte Megaspore Megagametophytearrow_forwardWhich statement below is correct regarding the formation of the endosperm in angiosperms? O the endosperm is formed from the female gametophyte and is haploid O a single sperm nucleus fertilizes the egg nucleus to become the diploid zygote O a sperm nucleus forms both the zygote and the endosperm through double fertilization O a second sperm nucleus fuses with the two polar nuclei of the egg sac МacВook Pro G Search or type URL @ 2# $ & * 2 3 4 6 8 W E R Yarrow_forwardThere are the two main characteristics specific to members of angiosperm and attributed as the reason for their success and diversity. What are they and explain how each contributes to the success of this group of plantsarrow_forward
- Which of the following is unique to angiosperms? Large vascular tissues (vessel elements) that support broad leaves Lignin that provide structural rigidity Stomata that enhance gas exchange Seeds that enable dormancyarrow_forwardThe best answer describing angiosperm fertilization is: O a single sperm fertilizes an egg a single sperm fertilizes the antipodal cells O a single sperm fuses with the two polar nuclei one sperm fertilizes the egg, one fuses with the two polar nuclei to create 3N tissue one sperm fertilizes the egg, one fuses with the antipodal cells to create 3N tissuearrow_forwardIn a typical angiosperm, what is the sequence of structures encountered by the tip of a growing pollen tube on its way to the egg? ovary → style → stigma stigma → style → ovary ovary→ stigma→ style stigma→ ovary → stylearrow_forward
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