SODIUM gSodium is a chemical element with the symbol Na (from Latin: natrium) and atomic number 11. It is a soft‚ silver-white‚ highly reactive metal and is a member of the alkali metals; its only stable isotope is 23Na. The free metal does not occur in nature‚ but instead must be prepared from its compounds; it was first isolated by Humphry Davy in 1807 by the electrolysis of sodium hydroxide. Sodium is the sixth most abundant element in the Earth’s crust‚ and exists in numerous minerals such
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c IB DIPLOMA PROGRAMME PROGRAMME DU DIPLÔME DU BI PROGRAMA DEL DIPLOMA DEL BI SPEC/4/BIOLO/HPM/ENG/TZ0/XX/M MARKSCHEME SPECIMEN PAPER BIOLOGY Higher Level Paper 1 2 pages –2– SPEC/4/BIOLO/HPM/ENG/TZ0/XX/M 1. B 16. C 31. D 46. – 2. C 17. B 32. D 47. – 3. D 18. B 33. A 48. – 4. D 19. B 34. D 49. – 5. D 20. B 35. C 50. – 6. D 21. B 36. D 51. – 7. B 22. B 37. B 52. – 8. B 23. D 38. D 53. – 9. A 24. C 39. A 54. – 10. D
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ECOLOGY OF BENTHIC POLYCHAETES IN THE HEATHCOTE ESTUARY‚ NEW ZEALAND I. N. ESTCOURT New Zealand Oceanographic Institute‚ Department of Scientific and Industrial Research‚ Wellington (Received for publication 20 March 1967) SUMMARY The distributions of 19 species of polychaetes burrowing in the intertidal sand and mudbanks of the Heathcote Estuary‚ New Zealand‚ are related to salinity‚ sediment grade‚ and length of time of exposure at low tide. Only Nicon aestuariensis Knox and Scotecolepides
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TOPIC 6‚ 11‚ & OPTION H: HUMAN HEALTH AND PHYSIOLOGY Digestive System Includes all the structures that are concerned with bringing food into the body to provide for the needs of the body’s cells. Each cell in an organism relies on a continuous expenditure of energy. Fats‚ carbs‚ and proteins are broken down during cellular metabolism and the energy derived from them is used to make ATP. The digestive system deals with: Ingestion‚ which is the bringing of nutrients into the body. Mechanical
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CARIBBEAN EXAMINATIONS COUNCIL Caribbean Advanced Proficiency Examination Biology Syllabus Effective for examinations from May/June 2008 Correspondence related to the syllabus should be addressed to: The Pro-Registrar Caribbean Examinations Council Caenwood Centre 37 Arnold Road‚ Kingston 5‚ Jamaica‚ W.I. Telephone Number: (876) 920-6714 Facsimile Number: (876) 967-4972 E-mail address: cxcwzo@cxc.org Website: www.cxc.org Copyright © 2007‚ by Caribbean Examinations Council The Garrison‚ St
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Trippple Award Specification (4BIO) Examination in 2012 Trippple Award Specification Key words are underlined in red. Practical work is printed in italics. Section 1: The nature and variety of living organisms Characteristics of living organisms include; M ovement R espitation S ensitivity G rowth R eproduction E xcretion N utrition In addition‚ all living organisms contain nucleic acids (DNA) and have the ability to control their internal conditions. Finally‚ all living
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A Critical Review of the Studies for Integreted Waste Management Facilities Phase 1 Chapter 1: literature review of EIA 1. What is EIA An environmental impact assessment (EIA) is an assessment of the possible positive or negative impact that a proposed project may have on the environment‚ together consisting of the environmental‚ social and economic aspects. The purpose of the assessment is to ensure that decision makers consider the ensuing environmental impacts when deciding whether
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Motion NCERT Chapter Questions and Answers and other Q & A Q1: An object has moved through a distance. Can it have zero displacement? If yes‚ support your answer with an example. Answer: Yes an object can have zero displacement even though it has moved through a distance. It happens when the object moves back to its original position i.e. final position coincides with the starting position. Example: Suppose an object travels from O to C and then comes back to original position O. Total
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SCHEME OF EXAMINATION FOR B.Sc. (ZOOLOGY) SEMESTER SYSTEM w.e.f. Session 2011-12 Scheme of B.Sc. 1st Year Semester I Sr. No. 1. 2. 3. 4. 5. Paper code 1.1 1.2 P-101 2.1 2.2 Nomenclature Life and Diversity from Protozoa to Porifera and Cell Biology – I Life and Diversity from Coelentrata to Helminthes and Cell Biology – II Practical Marks+IA 40+10 40+10 40+10 40+10 40+10 40+10 300 Periods / week 4 4 4 4 4 4 Exam. Duration 3 hrs. 3 hrs. 3hrs. 3 hrs. 3 hrs. 3hrs. Semester II Life and Diversity
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9.2 - Maintaining a Balance: 1. Most organisms are active within a limited temperature range: * Identify the role of enzymes in metabolism‚ describe their chemical composition and use a simple model to describe their specificity in substrates: * Role of enzymes in metabolism: * Metabolism refers to all the chemical reactions occurring in organisms * Enzymes are biological catalysts which increase the rate of chemical reactions * Without enzymes‚ metabolism
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