Concept explainers
To review:
The results drawn from the graph and draw conclusions regarding the springtails’ role in the reproduction of moss.
Introduction:
The arthropods help in the fertilization of the many plants. The arthropods help in the transfer of the motile gamete (generally male gamete) from one place to another, which assist the process of mating in between male and the female gamete. This can be studied by the presence of the gametes of the plant on the body of the arthropods.
Researchers propose hypothesis that sperm transfer in mosses is facilitated by springtails (a type of arthropod). This hypothesis was tested by researchers growing patches of male and female mosses separated at distances from each other and in the absence or presence of springtails. Researchers checked mean number of sporophytes in each female patch (to confirm occurrence of fertilization). Their results are shown in graph below (& means P **lt; 0.01, * means P < 0.05).
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Chapter 28 Solutions
Biological Science (7th Edition)
- Use the image to correctly fill in the following blanks. The whole specimen is a [A], a gametophyte structure found in the phylum [B]. The structures found within the circle are called, [C] and the arrows point at examples of [D]. [E] seen in the triangle are only to keep the plant anchored in place. ASUS VivoBookarrow_forwardDlanama Activity adapted from https://www.nwabr.ora/sites/default/files/Planaria Student.pdf The Planaria research project: During this investigation, you will conduct an experiment to explore the regenerative properties of Planaria. You will have three Planaria per team 1) Two "experimental" Planaria a Experimental Planaria #1: This Planarian will be cut into half (transverse plane: see figure below), that will result in two fragments with a front (anterior) and rear section (posterior). Every team in the class will do the same! (Why is it important to have experiments repeated multiple times?) b. Experimental Planaria #2: This Planarian will be cut in a manner determined by your team. 2) A "control" Planaria which will not be cut. Important things to remember: It is your responsibility to work in a cohesive manner with your team members. This project will span over three class periods. Each class period accounts for the following: o Day 1- Making cuts and recording measurements o Day…arrow_forwardLabel the following diagrams. (a) Spirogyra (Vegetative stage) 會 (b) (c) (d) (b-d) Spirogyra (Sexual reproduction stages) Why it is called Spirogyra?arrow_forward
- A hypothesized evolutionary advantage to asexual reproduction in fungi is that: -It allows them to form resting spores -It protects their genes from mutation -It allows them to avoid phages -It allows them to grow quickly when nutrient levels are richarrow_forwardDistinguish between succulent Ephorbiaceae and Cactaceae especially when considering sterile plants. Take a closer look at the specimens of Would you agree to the new classification system placing four families into one big family Malvaceae? Explain.arrow_forwardSuppose an efficient conducting system evolved in a moss thatcould transport water and other materials as high as a tall tree.Which of the following statements about “trees” of such aspecies would not be true?(A) Spore dispersal distances would probably increase.(B) Females could produce only one archegonium.(C) Unless its body parts were strengthened, such a “tree”would probably flop over.(D) Individuals would probably compete more effectively foraccess to light.arrow_forward
- 4) There are several other animal models that display regenerative properties including the zebrafish, salamander, and hydra. What specific strengths do planarians offer that makes studying regeneration feasible? 5) Discuss any one conceptual problem that can be addressed by studying regeneration in planaria. The discussion should include what is the problem and how does planaria help in studying the problem? I 6) What is a blastema? Where is it formed and how does it appear?arrow_forwardDiscus the important finding which could be obtained from a linear tetrad analysis that can not be learned from an unordered tetrad analysis in fungi validate your answer by diagrammatic representationarrow_forwardThis is a longitudinal section of a Marchantia sp. gametophyte body. Label the following structures: A.) thallus, B.) gemma cup, C.) gemmae.arrow_forward
- 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.arrow_forwardLichens are able to reproduce both sexually and asexually, with nearly 1/3 of all species reproducing solely by asexual means. Given that lichens are an association between multiple species from different kingdoms, how do you think this might work? What components would have to be present in the reproductive structure for reproduction to be successful?arrow_forwardWhich two structures evolved though a series of changes in the reproductive biology among some heterosporous plants during the late Devonian period allowed spermatophytes (seed plants) to reduce or eliminate their dependence on water for gamete fertilization and development of the embryo and allowed them to colonize a much wider range of habitats?arrow_forward
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