Download or read book Gametes Spores written by John Farley and published by . This book was released on 1982 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Guide to Plant Spores written by Florence J Martin and published by . This book was released on 2020-08-21 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spore, a reproductive cell capable of developing into a new individual without fusion with another reproductive cell. Spores thus differ from gametes, which are reproductive cells that must fuse in pairs in order to give rise to a new individual. Spores are agents of asexual reproduction, whereas gametes are agents of sexual reproduction. Spores are produced by bacteria, fungi, algae, and plants.Bacterial spores serve largely as a resting, or dormant, stage in the bacterial life cycle, helping to preserve the bacterium through periods of unfavourable conditions. Spore production is particularly common among Bacillus and Clostridium bacteria, several species of which are disease-causing. Many bacterial spores are highly durable and can germinate even after years of dormancy.Bacillus megaterium, an endospore-forming bacterium. The nearly mature spore is visible within the mother cell (magnified about 17,000 times).Among the fungi, spores serve a function analogous to that of seeds in plants. Produced and released by specialized fruiting bodies, such as the edible portion of the familiar mushrooms, fungal spores germinate and grow into new individuals under suitable conditions of moisture, temperature, and food availability.Many larger algae reproduce by spores and are also capable of sexual reproduction. A number of red algae species produce monospores (walled nonflagellate spherical cells) that are carried by water currents and form a new organism upon germination. Some green algae produce nonmotile spores, called aplanospores, whereas others produce motile zoospores, which lack true cell walls and bear one or more flagella. The flagella allow zoospores to swim to a favourable environment in which to develop, whereas monospores and aplanospores must rely on passive transport by water currents.Among plants-all of which have a life cycle characterized by alternating generations of asexually and sexually reproducing individuals-spores are the reproductive agents of the asexual generation. Produced by the sporophyte (i.e., spore-bearing) generation, plant spores give rise to the haploid gametophyte (i.e., gamete-bearing) generation. Spores are most conspicuous in the non-seed-bearing plants, including liverworts, hornworts, mosses, and ferns. In these lower plants, as in fungi, the spores function much like seeds. In general, the parent plant sheds the spores locally; the spore-generating organs are frequently located on the undersides of leaves. The spores of plants that inhabit the edges of bogs or lakes are frequently shed into the water or are carried there by rain and are preserved in the sediments. Wind dispersal is a factor in plants that shed their spores explosively.Among the seed-bearing plants-the gymnosperms and the angiosperms-the haploid spores are far less conspicuous. They are not released from the parent plant, but rather they germinate into microscopic gametophyte individuals that are entirely dependent upon the diploid sporophyte plant. Gymnosperms and angiosperms form two kinds of spores: microspores, which give rise to male gametophytes, and megaspores, which produce female gametophytes.
Download or read book Ferns Mosses Other Spore Producing Plants written by Steve Parker and published by Capstone. This book was released on 2009 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Concepts of Biology written by Samantha Fowler and published by . This book was released on 2018-01-07 with total page 618 pages. Available in PDF, EPUB and Kindle. Book excerpt: Concepts of Biology is designed for the single-semester introduction to biology course for non-science majors, which for many students is their only college-level science course. As such, this course represents an important opportunity for students to develop the necessary knowledge, tools, and skills to make informed decisions as they continue with their lives. Rather than being mired down with facts and vocabulary, the typical non-science major student needs information presented in a way that is easy to read and understand. Even more importantly, the content should be meaningful. Students do much better when they understand why biology is relevant to their everyday lives. For these reasons, Concepts of Biology is grounded on an evolutionary basis and includes exciting features that highlight careers in the biological sciences and everyday applications of the concepts at hand.We also strive to show the interconnectedness of topics within this extremely broad discipline. In order to meet the needs of today's instructors and students, we maintain the overall organization and coverage found in most syllabi for this course. A strength of Concepts of Biology is that instructors can customize the book, adapting it to the approach that works best in their classroom. Concepts of Biology also includes an innovative art program that incorporates critical thinking and clicker questions to help students understand--and apply--key concepts.
Download or read book Inanimate Life written by George M. Briggs and published by . This book was released on 2021-07-16 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Biology of Reproduction written by Giuseppe Fusco and published by Cambridge University Press. This book was released on 2019-10-10 with total page 491 pages. Available in PDF, EPUB and Kindle. Book excerpt: A look into the phenomena of sex and reproduction in all organisms, taking an innovative, unified and comprehensive approach.
Download or read book The Evolution of Sex in Plants written by John Merle Coulter and published by . This book was released on 1914 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book How Do Spores Select Where to Settle written by Matthias Heydt and published by Springer Science & Business Media. This book was released on 2011-05-04 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, Matthias Heydt applies digital in-line holography to achieve for the first time a complete three dimensional and real time motion analysis of Ulva zoospores, both in solution and in the vicinity of different surfaces. These results provide previously unknown information about the behavior and mechanism spores use to select a suitable site for settlement. This work gives deeper insight into biofouling algae and stimulates new design strategies for antifouling coatings. Furthermore, the tracking system developed during this research could be used as a new system for assessing the antifouling performance on different surfaces at very early points in time, allowing disentanglement of surface conditioning and interaction of spores with pristine chemistries.
Download or read book Exposing Men The Science and Politics of Male Reproduction written by Cynthia R. Daniels Associate Professor of Political Science Rutgers University and published by Oxford University Press, USA. This book was released on 2006-08-03 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: Exposing Men examines how ideals of masculinity have long skewed our societal--and scientific--understanding of one of the pillars of male identity: reproductive health. Only with the recent public exposure of men's reproductive troubles has the health of the male body been thrown into question, and along with it deeper masculine ideals. Whereas once men's sexual and reproductive abilities were the most taboo of topics, today erectile dysfunction is a multi-billion dollar business, and magazine articles trumpet male reproductive decline with headlines such as "You're Half the Man Your Father Was." Cynthia R. Daniels casts a gimlet eye on our world of plummeting sperm counts, spiking reproductive cancers, sperm banks, and pharmacological cures for impotence in order to assess the true state of male health. What she finds is male reproductive systems damaged by toxins and war, and proof piling up that men through sperm, pass on harm to the children they father. Yet, despite the evidence that men's health, as much as women's, significantly affects the vitality of their offspring, Daniels also sees a society holding on to outdated assumptions, one in which men ignore blatant health risks as they struggle to live up to antiquated ideas of manliness.
Download or read book Selection written by Graham Bell and published by OUP Oxford. This book was released on 2008-12-18 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book adopts an experimental approach to understanding the mechanisms of evolution and the nature of evolutionary processes, with examples drawn from microbial, plant and animal systems. It incorporates insights from remarkable recent advances in theoretical modelling, and the fields of molecular genetics and environmental genomics. Adaptation is caused by selection continually winnowing the genetic variation created by mutation. In the last decade, our knowledge of how selection operates on populations in the field and in the laboratory has increased enormously, and the principal aim of this book is to provide an up-to-date account of selection as the principal agent of evolution. In the classical Fisherian model, weak selection acting on many genes of small effect over long periods of time is responsible for driving slow and gradual change. However, it is now clear that adaptation in laboratory populations often involves strong selection acting on a few genes of large effect, while in the wild selection is often strong and highly variable in space and time. Indeed these results are changing our perception of how evolutionary change takes place. This book summarizes our current understanding of the causes and consequences of selection, with an emphasis on quantitative and experimental studies. It includes the latest research into experimental evolution, natural selection in the wild, artificial selection, selfish genetic elements, selection in social contexts, sexual selection, and speciation.
Download or read book Botany written by James D. Mauseth and published by Jones & Bartlett Learning. This book was released on 2003 with total page 923 pages. Available in PDF, EPUB and Kindle. Book excerpt: Botany: An Introduction to Plant Biology, Third Edition, provides an updated, thorough overview of the fundamentals of botany. The topics and chapters are organized in a sequence that is easy to follow, beginning with the most familiar - structure -- and proceeding to the less familiar -- metabolism -- then finishing with those topics that are probably the least familiar to most beginning students -- genetics, evolution, the diversity of organisms, and ecology.
Download or read book 10 in One Study Package for CBSE Biology Class 11 with 3 Sample Papers written by Disha Experts and published by Disha Publications. This book was released on 2017-08-29 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt: 10 in ONE CBSE Study Package Biology class 11 with 3 Sample Papers is another innovative initiative from Disha Publication. This book provides the excellent approach to Master the subject. The book has 10 key ingredients that will help you achieve success. 1. Chapter Utility Score: Evaluation of chapters on the basis of different exams. 2. Exhaustive theory based on the syllabus of NCERT books 3. Concept Maps for the bird's eye view of the chapter 4. NCERT Solutions: NCERT Exercise Questions. 5. VSA, SA & LA Questions: Sufficient Practice Questions divided into VSA, SA & LA type. . 6. HOTS/ Exemplar/ Value Based Questions: High Order Thinking Skill Based, Moral Value Based and Selective NCERT Exemplar Questions included.. 7. Chapter Test: A 15 marks test of 30 min. to assess your preparation in each chapter. 8. Important Formulas, terms and definitions 9. Full syllabus Model Papers - 3 papers with detailed solutions designed exactly on the latest pattern of CBSE. 10. Complete Detailed Solutions of all the exercises.
Download or read book The World wide Encyclopedia and Gazetteer written by William Harrison De Puy and published by . This book was released on 1899 with total page 838 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Visual Guide to Plants Algae and Fungi written by Sol90 Editorial Staff and published by The Rosen Publishing Group, Inc. This book was released on 2018-07-15 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: This colorful and stimulating volume will enthrall readers with its incredible presentations of complex algae, fungi, and plant life. Students will learn that there's more to flowers than beauty, some plants are dangerous to other plant life around them, and algae can reproduce in different ways depending on the species and environmental conditions. Readers will discover that some cultures have been using healing herbs for centuries, some fungi are pathogens, and algae is found in many food products, medicines, cosmetics, and even tools. With thorough explorations of various ecosystems and detailed diagrams of various industries, students will embrace and understand the integral roles that plants, algae, and fungi play in the survival and prosperity of our world.
Download or read book The New Werner Twentieth Century Edition of the Encyclopaedia Britannica written by and published by . This book was released on 1907 with total page 932 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Agricultural Microbiology written by R.P. Pareek and published by Scientific Publishers. This book was released on 2019-03-01 with total page 433 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text book is written keeping in mind the contents of the syllabus of the course ‘Agricultural Microbiology’ taught in BSc.(Ag) degree program all over the country as the syllabus is approved in Deans’ committee at ICAR level. The book will be useful for students and the teachers teaching the course. The book has five sections namely basics of microbiology which deals with fundamental principles of general microbiology. Section two covers ecology of soil biota and organisms in soil liter interfaces. Third section is biogeochemical cycles of plant nutrients discussing microbiological transformation of important plant nutrients and their movement in the soil constituents. Fourth section relates with applied aspect of agriculturally useful microorganisms dealing with biofertilizers and biocontrol agents. Fifth section discusses qualities of drinkable water and food and water borne diseases directly concerned with human hygiene. A chapter on traditional and molecular techniques to study soil microorganisms and their activities in situ and laboratory is also incorporated. The language of the book is simple and subject matter is discussed with help of illustration such as graphs, charts, tables and pictures, keeping readers in mind. In the end of each chapter exercise in the form of questions has been incorporated to help the student to recapitulate the contents of the chapter.
Download or read book Strickberger s Evolution written by Brian K. Hall and published by Jones & Bartlett Publishers. This book was released on 2011-06-07 with total page 779 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thoroughly updated and reorganized, Strickberger's Evolution, Fourth Edition, presents biology students with a basic introduction to prevailing knowledge and ideas about evolution, discussing how, why, and where the world and its organisms changed throughout history. Keeping consistent with Strickberger's engaging writing style, the authors carefully unfold a broad range of philosophical and historical topics that frame the theories of today including cosmological and geological evolution and its impact on life, the origins of life on earth, the development of molecular pathways from genetic systems to organismic morphology and function, the evolutionary history of organisms from microbes to animals, and the numerous molecular and populational concepts that explain the earth's dynamic evolution. Important Notice: The digital edition of this book is missing some of the images or content found in the physical edition.
