Concept explainers
(a)
To draw: A phylogeny of
Concept introduction: Phylogenetics is the branch of science that deals with estimating and analyzing evolutionary relatedness among various groups of organisms. It is based on the morphological as well as
In phylogenetic studies, the most convenient way of visualizing evolutionary connection among a group of organisms is through phylogenetic trees, which is represented by line and nodes.
(b)
To discuss: The evolution of the female gametophyte and endosperm in angiosperms with reference to the phylogenetic tree as shown in Fig.1.
Concept introduction: Phylogenetics is the branch of science that deals with estimating and analyzing evolutionary relatedness among various groups of organisms. It is based on the morphological as well as nucleic acid similarity.
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CAMPBELL'S BIOLOGY 12E PERUSALL
- 3. Identify key flower structures and describe differences between flower and pollen structures in monocots and dicots. 4. Explain what is meant by alternation of generations, sporophyte and gametophyte. 5. Describe how male and female reproductive cells are produced in angiosperms and the process of double fertilization. 000000arrow_forwardExplain the sequence of events in a flowering plant that begins with formation of a pollen tube and culminates with the formation of a diploid zygote and the 3n cell that will give rise to endosperm in a seed.arrow_forwardThe three main parts of a mature seed are _________ a. pollen grain, egg, and seed coat b. embryo, endosperm, and seed coat c. megaspores, microspores, and ovulearrow_forward
- In plants that lack endosperm in their mature seeds, the cotyledons function to (a) enclose and protect the seed (b) aid in seed dispersal (c) serve as an absorptive embryonic root (d) store food reserves (e) attach the embryo within the ovulearrow_forwardCorn develops from a seedling with a single cotyledon, displays parallel veins on its leaves, and produces monosulcate pollen. It is most likely: a gymnosperm a monocot a eudicot a basal angiospermarrow_forwardFigure 23.28 Which of the following statements about the Laminaria life cycle is false? In zoospores form in the sporangia. The sporophyte is the 2n plant. The gametophyte is diploid. Both the gametophyte and sporophyte stages are multicellular.arrow_forward
- Match the terms with the most suitable description. ____ ovule a. pollen tube together with its contents ____ receptacle b. consists of seven cells, one with two nuclei ____ double fertilization c. after fertilization, develops into a seed ____ anther d. embryonic shoot ____ plumule e. pollen sacs inside ____ mature female gametophyte f. swollen stem; base of flower ____ mature male gametophyte g. formation of zygote and first cell of endospermarrow_forwardDiscuss Concepts Compare the size, anatomical complexity, and degree of independence of a Douglas fir female gametophyte and a dogwood female gametophyte. Which one is the most protected from the external environment? Which trend(s) in plant evolution does your work on this question bring to mind?arrow_forwardThe nutritive tissue in the seeds of flowering plants that is formed from the union of a sperm cell and two polar nuclei is called the (a) plumule (b) endosperm (c) cotyledon (d) hypocotyl (e) radicalarrow_forward
- Figure 25.24 Which of the following statements about the fern life cycle is false? Sporangia produce haploid spores. The sporophyte grows from a gametophyte The sporophyte is diploid and the gametophyte is haploid. Sporangia form on the underside of the gametophyte.arrow_forwardIn flowers, the structures that produce male gametophytes are called _______ ;the strcutures that produce female gametophytes are called _______ . a. pollen grains; flowers c. anthers; stigma b. stamen; carpels d. megaspores; microsporesarrow_forwardTest Your Understanding Know and Comprehend 9. After fertilization, the______________ develop(s) into a fruit and the ______________ develop(s) into a seed. (a) ovary; ovule (b) polar nuclei; ovule (c) ovary; endosperm (d) ovule; ovary (e) ovule; polar nucleiarrow_forward
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