Biology Assessment Essay

Submitted By zahradelrey
Words: 1738
Pages: 7
Open Document
Using a light microscope and prepared slides to gather information and estimate the size of red and white blood cells of a human and a bird and drawing scaled diagrams of each
Aim: To perform an investigation to estimate the size of red and white blood cells using a light microscope and prepared slides of human and bird blood.
Hypothesis: If the sizes of red and white blood cells are estimated then human red blood cells will be about 6-8 micrometres and human white blood cells will be about 9-12 micrometres because white blood cells approximately 1.5 times bigger than red blood cells. Whereas bird red blood cells will be about 10-12 micrometres and the bird white blood cells will be 15-18 because the bird blood cells are larger than the human blood cells.
Materials:
- light microscope
- prepared slides of human blood
- prepared slides of bird blood
- mini-grid slide
- pencil
- paper
Method:
1. Place the mini-grid slide on the microscope on low power x4 (4x10 = 40) magnification
2. Calculate the diameter of the field of view by estimating the number of squares within the mid-point diameter of the grid slide and converting it to micrometres (1mm = 1000um)
3. Place the light microscope on high power x40 (40x10=400) magnification
4. Calculate the HP (high power) field of view by multiplying the LP field of view by 40/400 (1/10)
5. Place a prepared slide of human blood under the microscope on high power
6. Identify the red and white blood cells
7. Count the number of red blood cells across the field of view and estimate the size using the equation: cell length = field of view/number of cells across field of view
8. Repeat step 6 for the number of white blood cells
9. Draw a scaled diagram of the red and white blood cells
10. Place a prepared slide of bird blood under the microscope on high power
11. Repeat steps 5-9 for the bird blood cell
12. Record all results in a table

Results: Cell membrane Cell membrane Cytoplasm Cytoplasm Nucleus 8um 12um
Human red blood cell Human white blood cell

Cytoplasm

5um 7.5um
Bird red blood cell Bird white blood cell

Name of blood cell
Diameter of field of view (high power) in um
Estimated number of cells that could fit across diameter
Estimated size of one cell (um)

Human red blood cell
400um
50
8um
Human white blood cell
400um
Not identified
12um
Bird red blood cell
400um
80
5um
Bird white blood cell
400um
Not identified
7.5um

Working out:
Low Power = 4 x 10 = 40 High Power = 40 x 10 = 400
- Estimated LP diameter = 4mm x 1000 = 4000um
- HP field of view = 40 / 400 = 1/10 x 4000 = 400um
- Cell length = field of view/ number of cells

human red blood cell: 400 divided by 50 = 8um human white blood cell: 8um x 1.5 = 12um bird red blood cell: 400 divided by 80 = 5um bird white blood cell: 5um x 1.5 = 7.5um
Therefore the results show that red blood cells are in fact smaller than white blood cells regardless of whether it is blood of a human or another species. The shape of the red blood cells also differs from that of the white blood cell as the red blood cells appear biconcave from the side while the white blood cells usually appear in a disk shape and are spherical. They also differ in colour as the red blood cell is red in colour while the white blood cell is a purple shade due to the darkly staining nucleus it contains.
Conclusion: The red blood cells for both the human and bird blood cells were identified and the size was estimated through the estimated number of cells that could fit across the diameter. However the white blood cells were not observed as they could not be identified under the light microscope. This is due to the fact that white blood cells make up less than 0.1% whilst red blood cells make up 45% of the substance (NSW Biology 2007). Therefore the number of white blood cells was estimated by using the equation
Show More

Related Documents: Biology Assessment Essay

Biology Controlled Assessment Photosynthesis Year 9 Final Essay

Biology Controlled Assessment Photosynthesis Year 9 By Amira Wadar 1 Contents page Ώ Ώ Ώ Ώ Ώ Ώ Ώ Introduction Equipment list Method Preliminary Risk Assessment Results Evaluation Ώ Ώ Ώ Ώ Method Results Secondary data Hypothesis Ώ Conclusion Ώ Bibliography 2 Intro In this experiment we are going to be focusing on photosynthesis and the amount of oxygen bubbles produced as the amount of light intensity increases. What is photosynthesis and its importance? Photosynthesis is the process in which…

Words 2940 - Pages 12

Sex-Linked Traits Through Meiosis and How It Relates to Genetics. Essay

|Principles of Biology | Copyright © 2011, 2010, 2008 by University of Phoenix. All rights reserved. Course Description This course is designed to introduce…

Words 1614 - Pages 7

Gcse Research Paper

Route 1 A*-G One grade for Further Science Route 1 A*-G Number of sessions per week: 2 x 3hr session Triple Science Summary (Year 10 & 11) Course Title and Examination Board: AQA Science Biology AQA Science Chemistry AQA Science Physics Number of GCSEs or Equivalents: 3 GCSE grade A*-G One grade for Biology A*-G One grade for Chemistry A*-G One grade for Physics A*-G Number of sessions per week: 2 x 3hr session Outline of Triple Science Course Outline of Double…

Words 3972 - Pages 16

Umars Study Schedule Essay

to study Week 1, Day 1 You can use either Cliffs AP Biology 3rd Edition or Barron’s AP Biology. I personally used only Cliffs AP Biology 3rd edition. Using both would be best, but it is not necessary. I don’t recommend the 4th edition of AP Cliffs Biology, it was updated to eliminate much of the information in accordance with the new AP biology exam. ☐ Read AP Cliffs Ch. 1 “Chemistry” takes notes and memorize it ☐ Read AP Barron’s Biology Ch. 3 “Biochemistry” (notes are online on the dat bootcamp…

Words 3491 - Pages 14

Haed: Laboratory and Independent Research Project Essay

Honors Biology I Mrs. Jenn Choumil - jvchoumil@fcps.edu Mr. Joe Dishun– jdishun@fcps.edu Mr. Wayne Smith – wasmith@fcps.edu Course Objectives Achieve a solid baseline of scientific knowledge in the biological sciences content strands to make determinations about how the world works…

Words 2259 - Pages 10

Becoming A Physician Assistant

the use of self-assessment, research on specific careers, and my plans for the future. Self-assessment, which is the process of learning about oneself to assess the features that make oneself, can be used in the career decision making process to learn more about oneself and what one may be interested in as their career field. Popular forms of self-assessment include discussions with friends and family, reflective exercises such as journaling, and tests. Tests used for self-assessment include the Myers-Briggs…

Words 760 - Pages 4

Money: Biology and Biological Science Books Essays

INVESTIGATIONS IN BIOLOGICAL SCIENCE Eleventh Edition Melinda F. Davis, Ph.D. Professor of Biology & Suzanne W. Hedden, Ph.D. Professor of Zoology With the collaboration of Seema Dhir, M.S. Department of Biology Fort Valley State University Fort Valley, Georgia Bellwether Press Cover Art c 1998 by Burgess Publishing Company Copyright 1998, 1994, 1987, 1985, 1984, 1981, 1978, 1977 by Suzanne W. Hedden…

Words 1005 - Pages 5

Pharmacist Career Research Paper

An aspiring pharmacist should have skills such as memorization, attention to detail, strong math and science skills, drug preparation, drug knowledge and assessment, being able to work with people, supervising others, computer literacy, specialty training, and teaching (Alison Hart). Pharmacists must be able to memorize drug facts, such as their brand names, their side effects and possible drug relations (Alison Hart). They also must keep up-to-date with the latest drugs entering the field by continuing…

Words 197 - Pages 1

Health Science paper

Exemptions: Certain Ontario Academic Credit (OAC), college or university credits may qualify you for course exemptions. Many courses are also eligible for prior learning assessment, based on your previous education and experiential learning. For information, see page 264. Grade 11 Math (M or U) or Grade 12 (C or U) Grade 11 Biology (C or U) or Grade 12 (U) Interview Other Program code Total fees** School of Health & Wellness Activation Co-ordinator/Gerontology (pg 159) C102 7…

Words 548 - Pages 3

Essay Simple Scientific Research

research using the Scientific Method. Interpret Data gathered from research and discuss its importance. Establish co- relations and trends using graphs. Stage 2- Assessment Evidence Performance Tasks: (6 Facets of Understanding) Successfully prepare a mounted wet slide. Completing a Safety Rule Lab Report. Taking 3 Assessment Quizzes, 1 Unit Exam Designing a simple experiment with one controlled variable, using a rubric. Maintaining a complete Unit Journal/ Plant’s growth Project Other Evidence:…

Words 637 - Pages 3