Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 28.2, Problem 2R
Summary Introduction
To review:
To explain the distinguishing features and role of megagametophyte and pollen grains in the life cycle of gymnosperms.
Introduction:
During evolution, gymnosperms were the first successful terrestrial plants. Conifers are the group of gymnosperm which is found in abundant quantity. They mainly include pines and redwoods plants. Approximately 700 species of cone-bearing plants called conifers are found in the world.
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Explain Affinities of cycadales.
Which of the following comparisons between the moss life cycle and fern life cycle are correct? A) Mosses have flagellated sperm that need water to reach the female gamete, while the sperm of ferns are unflagellated and are not dependent on water.B) The sporophyte generation is smaller than the gametophyte generation in mosses, but the sporophyte generation is much larger than the gametophyte generation in ferns.C) The spores are produced in capsules on stalks in mosses but in small structures called sori on the underside of leaves in ferns.D) The gametes are produced in gametangia in mosses but in specialized structures on the underside of leaves in ferns.E) Both kinds of plants depend on wind for dispersal of spores.
The sporophyte generation in higher plants include which of the following:
1) seta
2) plant embryo 3
) anther
4) embryo sac
5) seed cone
6) fruit
7) pollen grain
8.) needle-like leaves
9) protonemata
2. Which characterize Gnetum gnemon? 1
) netlike venation
2) tracheary elements (vessels and tracheids
3) naked ovules
4) linear, entire leaves
5) dioecious flowers
6) parallel venation
7) vessels
8. broad, entire leaves
9) tracheids
10) ovary walls
11) monoecious flowers
Chapter 28 Solutions
Life: The Science of Biology
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- http://botit.botany.wisc.edu/botany_130/diversity/plants/mosses.html Make a complete moss life cycle with the following phases and structures. Note: download the images of Mnium from this link and arrange them in the exact sequence to make the lifecycle. Lifecycle structures with cell division: Meiosis, fertilization within archegonium, capsule (sporangium), spores (n), protonema (n) (Image), male gametophyte (n) (Image), female gametophyte (n) (Image), antheridia (Image), archegonia (Image), sperm, egg, water, zygote (2n), embryo, young growing sporophyte (2n), mature sporophyte (2n) (Image), rhizoids. You can insert the non-image part, using the textbox and fill out the suitable s text. For symbol, click on the shape option and inter in your lifecycle diagram at the required placearrow_forwardDescribe the life history of fern with the significance of alternation of generations.arrow_forwardByrophytes are usually found in areas that are very wet or damp at least part of the year. Which of the following statements describes characteristics of byrophytes that make them dependent on water? State all that numbers that apply. 1. They have a dominant gametophyte phase. 2. They have swimming sperm that need water so they can swim to fertilize the eggs of other nearby plants. 3. They do not have lignin-stiffened vascular tissue or roots to effectively distribute water throughout the plant.arrow_forward
- Seed cones are variable, with those of Cycas revoluta usually considered the most relictual.arrow_forwardDraw and label the microsporopyll, microsporangia, megasporophyll and ovules of the reproductive structures of Ginkgo biloba.arrow_forwardDraw a generalized pine tree life cycle and identify the following structures: male and female gametophytes, pollen grain, integuments, archegonium, egg, embryo, and sporophyte.arrow_forward
- Sketch the following structures: cotyledons of pine nuts, embryo of pine nuts, root radicle of pine nuts, megagametophyte of pine nuts, seed coat of pine nuts.arrow_forwardlabel the branching frond and describe the branching pattern of the habit of galaxauraarrow_forwardClassify what specific or what groups of plants (could be all groups if it is common) possess the following: 1. flower 2. rhizoids 2. sporophyll 3. sperm with flagella 4. ovules 5. archegonium 6. rhizoids 7. phloem 8. pollen 9. roots 10. sporangium 11. carpel 12. sori/sorus 13. cones 14. wood 15. antheridium 15. seed coat 16. root hairs 17. xylemarrow_forward
- Draw the portion of the specialized leaves of a Kalanchoe and indicate its specialized function.arrow_forwardGymnosperm A) How are the seeds of pine trees dispersed away from the parent plant? b) Suggest an advantage of dispersing seeds away from parent plants.arrow_forwardIn a bisexual flower if androcium and gynoecium mature at different time the phenomeon is known as _________ A) Dichogamy B) Herpogamy C) Haterogamy monogamy D) None of thesearrow_forward
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