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Reproduction in Plants Which But, She Has Never Seen the Seeds We Shall Learn in This Chapter
Reproduction in 12 Plants o produce its kind is a reproduction, new plants are obtained characteristic of all living from seeds. Torganisms. You have already learnt this in Class VI. The production of new individuals from their parents is known as reproduction. But, how do Paheli thought that new plants reproduce? There are different plants always grow from seeds. modes of reproduction in plants which But, she has never seen the seeds we shall learn in this chapter. of sugarcane, potato and rose. She wants to know how these plants 12.1 MODES OF REPRODUCTION reproduce. In Class VI you learnt about different parts of a flowering plant. Try to list the various parts of a plant and write the Asexual reproduction functions of each. Most plants have In asexual reproduction new plants are roots, stems and leaves. These are called obtained without production of seeds. the vegetative parts of a plant. After a certain period of growth, most plants Vegetative propagation bear flowers. You may have seen the It is a type of asexual reproduction in mango trees flowering in spring. It is which new plants are produced from these flowers that give rise to juicy roots, stems, leaves and buds. Since mango fruit we enjoy in summer. We eat reproduction is through the vegetative the fruits and usually discard the seeds. parts of the plant, it is known as Seeds germinate and form new plants. vegetative propagation. So, what is the function of flowers in plants? Flowers perform the function of Activity 12.1 reproduction in plants. Flowers are the Cut a branch of rose or champa with a reproductive parts. -
Feeding-Dependent Tentacle Development in the Sea Anemone Nematostella Vectensis
bioRxiv preprint doi: https://doi.org/10.1101/2020.03.12.985168; this version posted March 12, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. Feeding-dependent tentacle development in the sea anemone Nematostella vectensis Aissam Ikmi1,2*, Petrus J. Steenbergen1, Marie Anzo1, Mason R. McMullen2,3, Anniek Stokkermans1, Lacey R. Ellington2, and Matthew C. Gibson2,4 Affiliations: 1Developmental Biology Unit, European Molecular Biology Laboratory, 69117 Heidelberg, Germany. 2Stowers Institute for Medical Research, Kansas City, Missouri 64110, USA. 3Department of Pharmacy, The University of Kansas Health System, Kansas City, Kansas 66160, USA. 4Department of Anatomy and Cell Biology, The University of Kansas School of Medicine, Kansas City, Kansas 66160, USA. *Corresponding author. Email: [email protected] 1 bioRxiv preprint doi: https://doi.org/10.1101/2020.03.12.985168; this version posted March 12, 2020. The copyright holder for this preprint (which was not certified by peer review) is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under aCC-BY 4.0 International license. Summary In cnidarians, axial patterning is not restricted to embryonic development but continues throughout a prolonged life history filled with unpredictable environmental changes. How this developmental capacity copes with fluctuations of food availability and whether it recapitulates embryonic mechanisms remain poorly understood. To address these questions, we utilize the tentacles of the sea anemone Nematostella vectensis as a novel paradigm for developmental patterning across distinct life history stages. -
Revised Glossary for AQA GCSE Biology Student Book
Biology Glossary amino acids small molecules from which proteins are A built abiotic factor physical or non-living conditions amylase a digestive enzyme (carbohydrase) that that affect the distribution of a population in an breaks down starch ecosystem, such as light, temperature, soil pH anaerobic respiration respiration without using absorption the process by which soluble products oxygen of digestion move into the blood from the small intestine antibacterial chemicals chemicals produced by plants as a defence mechanism; the amount abstinence method of contraception whereby the produced will increase if the plant is under attack couple refrains from intercourse, particularly when an egg might be in the oviduct antibiotic e.g. penicillin; medicines that work inside the body to kill bacterial pathogens accommodation ability of the eyes to change focus antibody protein normally present in the body acid rain rain water which is made more acidic by or produced in response to an antigen, which it pollutant gases neutralises, thus producing an immune response active site the place on an enzyme where the antimicrobial resistance (AMR) an increasing substrate molecule binds problem in the twenty-first century whereby active transport in active transport, cells use energy bacteria have evolved to develop resistance against to transport substances through cell membranes antibiotics due to their overuse against a concentration gradient antiretroviral drugs drugs used to treat HIV adaptation features that organisms have to help infections; they -
Study Guide Medical Terminology by Thea Liza Batan About the Author
Study Guide Medical Terminology By Thea Liza Batan About the Author Thea Liza Batan earned a Master of Science in Nursing Administration in 2007 from Xavier University in Cincinnati, Ohio. She has worked as a staff nurse, nurse instructor, and level department head. She currently works as a simulation coordinator and a free- lance writer specializing in nursing and healthcare. All terms mentioned in this text that are known to be trademarks or service marks have been appropriately capitalized. Use of a term in this text shouldn’t be regarded as affecting the validity of any trademark or service mark. Copyright © 2017 by Penn Foster, Inc. All rights reserved. No part of the material protected by this copyright may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, or by any information storage and retrieval system, without permission in writing from the copyright owner. Requests for permission to make copies of any part of the work should be mailed to Copyright Permissions, Penn Foster, 925 Oak Street, Scranton, Pennsylvania 18515. Printed in the United States of America CONTENTS INSTRUCTIONS 1 READING ASSIGNMENTS 3 LESSON 1: THE FUNDAMENTALS OF MEDICAL TERMINOLOGY 5 LESSON 2: DIAGNOSIS, INTERVENTION, AND HUMAN BODY TERMS 28 LESSON 3: MUSCULOSKELETAL, CIRCULATORY, AND RESPIRATORY SYSTEM TERMS 44 LESSON 4: DIGESTIVE, URINARY, AND REPRODUCTIVE SYSTEM TERMS 69 LESSON 5: INTEGUMENTARY, NERVOUS, AND ENDOCRINE S YSTEM TERMS 96 SELF-CHECK ANSWERS 134 © PENN FOSTER, INC. 2017 MEDICAL TERMINOLOGY PAGE III Contents INSTRUCTIONS INTRODUCTION Welcome to your course on medical terminology. You’re taking this course because you’re most likely interested in pursuing a health and science career, which entails proficiencyincommunicatingwithhealthcareprofessionalssuchasphysicians,nurses, or dentists. -
Introduction to Marine Biology
Short Communication Volume 10:S1, 2021 Molecular Biology ISSN: 2168-9547 Open Access Introduction to Marine Biology Subhashree Sahoo* Trident College, Bhubaneswar, Odisha 751024, India Abstract Introduction to marine biology is a 3-praise lesson credited finished the Florida Solutions Communal University. It includes a smallest of 45 interaction times that comprise together addresses and applied actions. This lesson canister usually is alienated in four units. Marine biology is a newer science than earthly ecology as initial experts were incomplete in their education of water creatures through absence of skill toward detect and example them. The Greek theorist Aristotle was unique of the 1st to project an organization system for alive organisms, which he named “the ladder of life” and in which he designated 500 classes, numerous of which were maritime. He also deliberates fish gills and cuttlefish. The Roman biologist Pliny the Leader available a 37-volume effort named Natural History, which limited numerous maritime classes. Slight effort on usual past remained showed throughout the central days, and it wasn’t pending the nighttime 18th period and initial 19th period that attention in the maritime setting was rehabilitated, powered through examinations now complete conceivable through healthier vessels and better steering methods. Keywords: Molecular, Biology, Marine. Introduction has an optimum variety of apiece ecological issue that touches it. Outdoor of this best, regions of pressure exist, anywhere the creature may nosedive toward replicate. Most maritime creatures are ectotherms, powerless toward Fish source the highest measurement of the universe protein expended switch their interior text infection, so fast or loosing warmth after their outside through persons. -
Feeding-Dependent Tentacle Development in the Sea Anemone Nematostella Vectensis ✉ Aissam Ikmi 1,2 , Petrus J
ARTICLE https://doi.org/10.1038/s41467-020-18133-0 OPEN Feeding-dependent tentacle development in the sea anemone Nematostella vectensis ✉ Aissam Ikmi 1,2 , Petrus J. Steenbergen1, Marie Anzo 1, Mason R. McMullen2,3, Anniek Stokkermans1, Lacey R. Ellington2 & Matthew C. Gibson2,4 In cnidarians, axial patterning is not restricted to embryogenesis but continues throughout a prolonged life history filled with unpredictable environmental changes. How this develop- 1234567890():,; mental capacity copes with fluctuations of food availability and whether it recapitulates embryonic mechanisms remain poorly understood. Here we utilize the tentacles of the sea anemone Nematostella vectensis as an experimental paradigm for developmental patterning across distinct life history stages. By analyzing over 1000 growing polyps, we find that tentacle progression is stereotyped and occurs in a feeding-dependent manner. Using a combination of genetic, cellular and molecular approaches, we demonstrate that the crosstalk between Target of Rapamycin (TOR) and Fibroblast growth factor receptor b (Fgfrb) signaling in ring muscles defines tentacle primordia in fed polyps. Interestingly, Fgfrb-dependent polarized growth is observed in polyp but not embryonic tentacle primordia. These findings show an unexpected plasticity of tentacle development, and link post-embryonic body patterning with food availability. 1 Developmental Biology Unit, European Molecular Biology Laboratory, 69117 Heidelberg, Germany. 2 Stowers Institute for Medical Research, Kansas City, MO 64110, -
Lerner's Concept of Developmental Homeostasis and the Problem of Heterozygosity Level in Natural Populations
Heredity 55 (1985) 341—353 The Genetical Society of Great Britain Received 20 March 1985 Lerner's concept of developmental homeostasis and the problem of heterozygosity level in natural populations G. Livshits and E. Kobyliansky Department of Anatomy and Anthropology, Sackler Faculty of Medicine, Tel Aviv University, Ramat Aviv, Israel. In recent years adherents of the neutral mutation hypothesis have conducted a variety of statistical tests concerning the applicability of their theory to data of biochemical genetic polymorphism in natural populations. From the other side, the involvement of natural selection as a main evolutionary force responsible for the observed levels of polymorphism and heterozygosity have also been proposed in numerous field studies and theoretical considerations. However, none of these hypotheses completely and satisfactorily explains the collected data. We believe that one of the main causes of the discrepancy in theories is that the variability at each locus is considered independently in both of the above- mentioned approaches. Yet, it was suggested long ago, and now there is an increasing amount of evidence indicating cooperation between different loci which can influence the variability at each of them. Thus we think that the use of models considering the genome as a suit of independent genes is a priori expected to decrease the efficacy of the approximation. In the present review we attempt to draw attention to findings of interdependence of the variability of different characters and its possible limiting action on the growth of genetic diversity in natural populations. We do not try to give a universal explanation for the processes acting in populations and determining levels of heterozygosity. -
Visual Fields in Hornbills: Precision-Grasping and Sunshades
Ibis (2004), 146, 18–26 Blackwell Publishing Ltd. Visual fields in hornbills: precision-grasping and sunshades GRAHAM R. MARTIN1* & HENDRI C. COETZEE2 1School of Biosciences, The University of Birmingham, Edgbaston, Birmingham B15 2TT, UK 2Ground Hornbill Research and Conservation Project, Private Bag X1644, Warmbaths, 0480, Republic of South Africa Retinal visual fields were determined in Southern Ground Hornbills Bucorvus leadbeateri and Southern Yellow-billed Hornbills Tockus leucomelas (Coraciiformes, Bucerotidae) using an ophthalmoscopic reflex technique. In both species the binocular field is relatively long and narrow with a maximum width of 30° occurring 40° above the bill. The bill tip projects into the lower half of the binocular field. This frontal visual field topography exhibits a number of key features that are also found in other terrestrial birds. This supports the hypothesis that avian visual fields are of three principal types that are correlated with the degree to which vision is employed when taking food items, rather than with phylogeny. However, unlike other species studied to date, in both hornbill species the bill intrudes into the binocular field. This intrusion of the bill restricts the width of the binocular field but allows the birds to view their own bill tips. It is suggested that this is associated with the precision-grasping feeding technique of hornbills. This involves forceps-like grasping and manipulation of items in the tips of the large decurved bill. The two hornbill species differ in the extent of the blind area perpendicularly above the head. Interspecific comparison shows that eye size and the width of the blind area above the head are significantly cor- related. -
African Gray Hornbill Class: Aves
Tockus nasutus nasutus African Gray Hornbill Class: Aves. Order: Coraciiformes. Family: Bucerotidae. Other names: Gray hornbill, hornbill Physical Description: Male—dun-colored with a central light stripe from hind neck to rump; head, throat, neck more or less gray with a broad white stripe over eye to nape; wing feathers and coverts (feathers covering the bases of the quills of the wings and tail) edged with whitish; outer tail feathers tipped white; underside creamy white; bill black with a splash of cream at base of upper mandible. Female—smaller, bill is colored red at tip, and greater part of the upper mandible is yellow. Hornbills are about 18 inches, males being larger than females. The wingspan of the gray hornbill is 7.5- 10 inches and weighs 5-9oz. Diet in the Wild: bird eggs and nestlings, insects, rodents, lizards, frogs, supplemented with small fruit and seeds especially during the dry season. Diet at the Zoo: Apples, papayas, grapes, hard-boiled eggs, mealworms, softbill diet, pinkie mice Habitat & Range: Sub-Saharan and Eastern Africa into Arabia, living in open woodlands and tree hollows Life Span: Up to 25 years Perils in the wild: Birds of prey, some carnivores, man, habitat destruction Physical Adaptations: Hornbills have huge, two-tiered beaks that cause the birds to appear top-heavy. The bill is long forming dexterous forceps. The cutting edges are serrated for breaking up food. The casque surmounting the bill is a narrow ridge that may reinforce the upper mandible. In spite of its heavy appearance, the structure is a light skin of keratin overlying a bony support. -
THE Fungus FILES 31 REPRODUCTION & DEVELOPMENT
Reproduction and Development SPORES AND SO MUCH MORE! At any given time, the air we breathe is filled with the spores of many different types of fungi. They form a large proportion of the “flecks” that are seen when direct sunlight shines into a room. They are also remarkably small; 1800 spores could fit lined up on a piece of thread 1 cm long. Fungi typically release extremely high numbers of spores at a time as most of them will not germinate due to landing on unfavourable habitats, being eaten by invertebrates, or simply crowded out by intense competition. A mid-sized gilled mushroom will release up to 20 billion spores over 4-6 days at a rate of 100 million spores per hour. One specimen of the common bracket fungus (Ganoderma applanatum) can produce 350 000 spores per second which means 30 billion spores a day and 4500 billion in one season. Giant puffballs can release a number of spores that number into the trillions. Spores are dispersed via wind, rain, water currents, insects, birds and animals and by people on clothing. Spores contain little or no food so it is essential they land on a viable food source. They can also remain dormant for up to 20 years waiting for an opportune moment to germinate. WHAT ABOUT LIGHT? Though fungi do not need light for food production, fruiting bodies generally grow toward a source of light. Light levels can affect the release of spores; some fungi release spores in the absence of light whereas others (such as the spore throwing Pilobolus) release during the presence of light. -
Kingfishers to Mousebirds
3.8 Kingshers to mousebirds - Atlas of Birds uncorrected proofs Copyrighted Material Kingfishers to Mousebirds he orders featured on this spread include many of the planet’s most P Size of orders Trogoniformes: trogons R Teye-catching bird families. Some, such as kingfishers and rollers, Number of species in order Trogons make up a single family, the Trogonidae, are known for their dazzling plumage. Others, such as toucans and Percentage of total bird species which numbers seven genera, including the spectacular quetzals (Pharomachrus spp.) of hornbills, sport preposterously big bills. Though smaller species Coraciiformes South and Central America. Their weak feet are in some groups may superficially resemble songbirds, all have a 403 species unique among animals in having a heterodactyl number of key anatomical differences from the Passeriformes, and 4.1% toe arrangement: first and second toes facing none can sing. backwards; third and fourth toes forwards. They are colourful but retiring birds that These orders also share many features of their breeding behaviour, inhabit tropical forests worldwide – with the with the majority of families and species nesting in holes, and many greatest diversity in the Neotropics – and use performing flamboyant courtship displays. The exception to this rule Piciformes their short, broad bill to feed on insects and are the Coliiformes of Sub-Saharan Africa, which are neither colourful 403 species fruit, generally gleaned from the branches in 4.1% a brief fluttering flight. Trogons are typically nor cavity nesters – they build a simple cup-shaped nest in foliage – and have located by their soft, insistent call, given ) an evolutionary history that sets them apart from other near-passerines. -
1 Basic Biological Principles.Pdf
Basic Biological Principles Biology = The study of Life Characteristics of Life Complex Organization Metabolism (Energy Flow) Homeostasis Reproduction and Heredity Growth and Development Response to Stimuli Sample Question A virus consists of a single strand of DNA enclosed in a protein capsule. Is a virus considered a living organism? A. Yes; since the virus contains protein, it is a living organism. B. Yes; since the virus contains DNA, it is a living organism. C. No; living organisms must have two characteristics of life, and the T4 bacteriophage only has one. D. No; viruses are not considered to be living organisms. Answer: D All living organisms must have an organized structure, obtain and use energy and materials, maintain homeostasis, grow, reproduce and pass on genetic information, and respond to stimuli and evolve/adapt to their environment. Although viruses contain DNA and pass their DNA on to their offspring, they cannot do this unassisted, nor do they meet all the other criteria for living organisms. Thus, viruses are not considered to be living organisms. Complex Organization Everything in the world is made up of matter and all matter is made up of atoms Elements = consist of only one kind of atom Compounds = two or more elements combined Living organisms are composed of many different organic (carbon-based) and inorganic compounds Cells = composed of many different compounds, basic building blocks of life Sample Question What is the single most abundant compound in living organisms? A. fat B. carbon C. sugar D. water Answer: D Water is the single most abundant compound in all living organisms.