1. Plant breeders wanted to produce a better variety of tomato by selective breeding. Two plants‚ of the varieties Tangella and Piranto‚ were crossed. (a) Some flowers of each variety were covered with cellophane bags. The diagram shows a covered flower and a brush. (i) Explain why some flowers were covered with cellophane bags during the selective breeding. .......................................................................................................................... ........
Premium DNA Gene Bacteria
IB Chemistry Summary- By Paul Li & Silvia Riggioni TABLE OF CONTENTS Table of Contents............................................................................................................................................................ 1 Atomic Theory................................................................................................................................................................ 3 The Electromagnetic Spectrum.............................................
Free Atom Periodic table Covalent bond
IGSCE Chemistry Notes Oxides Oxides are used to determine whether an element is a metal or a non-metal. Most non-metals are classed as acidic oxides. While most metals are classed as basicoxides. Acidic Oxides * Reacts with water to form acids * Neutralises alkaline solution to form salt + water Basic Oxides * Neutralises acidic solutions to form salt + water Amphoeteric Oxides * These are non-metals which display both acidic and basic properties Alkaline Oxides * Reacts
Premium Oxygen Carbon dioxide Hydrogen
GCSE Geography Nicholas Rowles Series Editor: Jayne de Courcy PerfectBound An e-book from HarperCollins Publishers 77–85 Fulham Palace Road Hammersmith‚ London W6 8JB First published 2001 © HarperCollinsPublishers Ltd‚ 2001 Nicholas Rowles asserts the moral right to be identified as the author of this work Acrobat eBook Reader edition v 1. April 2001 ISBN: 0-00-712985-8 All rights reserved. You have been granted a non-exclusive‚ nontransferable licence to access and read the text
Premium Plate tectonics
Section A (Answer ALL questions in this Section.) 1. Rubidium (Rb) and potassium belong to the same group in the Periodic Table. The relative atomic mass of rubidium is larger than that of potassium. (a) Explain whether rubidium is more reactive than potassium. (b) Write a chemical equation for the reaction between rubidium and water. (State symbols should be given.) (c) Suggest how rubidium can be stored safely in the laboratory. (d) Suggest ONE safety precaution for handling
Premium Chlorine Sodium hydroxide Acid
BIOLOGY Paper 2 Core 1 hour 15 minutes No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write in dark blue or black pen. You may use a pencil for any diagrams or graphs. Do not use staples‚ paper clips‚ highlighters‚ glue or correction fluid. Answer all questions. 1 2 3 4 5 6 7 8 9 Total This document consists of 14 printed pages and 2 blank pages. IB10 11_0610_21/4RP © UCLES 2010 [Turn over 2 1 (a) Fig. 1.1 shows a mammal. For Examiner’s
Premium Heart Blood Pulmonary artery
Compare and Contrast the way three poems from the anthology and outside the anthology present the theme of death Essay Title: How is death portrayed in different forms in poems? The poems War Photographer (Carol Ann Duffy)‚ A mother in a refugee camp (Chinua Achebe) and Do not go gentle into that Good Night (Dylan Thomas) have misleading initial impressions but the deep concept that lies in all these poems is death. Death is a common concept used in poetry that relates to war‚ husband – wife relationships
Free Poetry Death Chinua Achebe
To enable a character to change so much‚ her flaws have to be evident and abundant before the metamorphosis occurs. Priestly obliges in the stage directions offering Sheila as a ‘girl’ showing her immaturity even though she is in her twenties and that she is ‘pleased with life’‚ which is rather damning as we soon realise all she has accomplished is being her father’s daughter and gotten engaged. In giving her such a start in the audience’s eyes‚ we see how trapped Sheila is‚ not only through her
Premium The Stage Life English-language films
Physics Moment of a force: Moment of a force = force x perpendicular distance of the line if action if the force from fulcrum Law of moments: When a body is in equilibrium the sum of the clockwise moments about any point equals the sum of the anticlockwise moments about the same point. Centre of mass: Centre of mass is the point where whole mass of the body assumes to be concentrated. II. If the vertical line through the centre of mass is outside the base it will be a topples but if it’s passed
Free Thermodynamics Energy Resistor
N10/4/CHEMI/SP2/ENG/TZ0/XX 88106105 CHEMISTRY STANDARD LEVEL PAPER 2 Thursday 11 November 2010 (afternoon) Candidate session number 0 1 hour 15 minutes 0 INSTRUCTIONS TO CANDIDATES • • • • Write your session number in the boxes above. Do not open this examination paper until instructed to do so. Section A: answer all of Section A in the spaces provided. Section B: answer one question from Section B. Write your answers on answer sheets. Write your session number
Premium Thermodynamics Sodium hydroxide Ammonia