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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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Chapter 30 Solutions
Campbell Biology (11th Edition)
- 10) A team of botanists discovers a new species of plant in a tropical rain forest. After observing its anatomy and life cycle, they note the following characteristics and observations:- Presence of pollen cones and ovulate cones- Diploid-dominant- Seeds- vascular tissues- Absence of anything that resembles a flowerThis plant is probably a(n) Group of answer choices moss angiosperm protist gymnosperm fernarrow_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_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_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_forward
- Discuss 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_forwardFigure 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_forward
- In 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_forwardWhich of the following is not an example of pattern formation in developing plants? a. an epidermal cell receiving developmental signals from acortical cell b. the loosening of the cell wall to allow the elongation ofselected cells to reach mature size c. regulation by homeobox genes of the position of differentflower parts d. oriented cell division that establishes the shape of an organ e. cell expansion that directs specific cells to undergo mitosis ata given time and placearrow_forward
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