Archive for April, 2010

Semester 2 exam review

Wednesday, April 21st, 2010
urgent by john.meguerian on flickr

urgent by john.meguerian on flickr

Here is the revision checklist as promised, in traffic light form. 

LOOK AT IT NOW – DON”T WAIT UNTIL THE WEEKEND BEFORE YOUR EXAMS. 

I will be available for tutorials every day next week.  Happy revising!

Grade 9 Integrated Science Learning Outcomes

Revision tips and command terms

Monday, April 19th, 2010
exam cartoons by Robin Hutton on flickr

exam cartoons by Robin Hutton on flickr

So you have all the infomation you need to succeed in the upcoming exams.  Make sure you also know the command terms used by the IB. 

It is no good knowing the syllabus inside out, but then answering an explain question by describing, or a distinguish question by comparing. 

Check out this very helpful presentation by Mr Taylor in Bandung that clarifies these action verbs.  It is an important part of your revision.

And for HL candidates, here’s the syllabus outline for Option H. Option H syllabus guide

Refraction of light

Monday, April 19th, 2010
refraction by Moh_Tj on flickr

refraction by Moh_Tj on flickr

We’re going to learn about refraction and how it happens.  Thanks to Mr Duckworth for producing these notes to help us. Grade 9 Integrated Science Waves Topic – refraction  

We’ll also be doing a lab to collect some data and find out the refractive index of glass and perspex.  The rubric is here: Pre IB Lab Rubric 08 – 09  You will be assessed on the data collection and processing part only.

H6 Gas exchange

Thursday, April 15th, 2010

You need to get your head around this.  Gas Exchange     The effect of exercise on heart and lungs    And here’s a great presentation to help.

  • Define partial pressure.
  • Explain the oxygen dissociation curves of adult hemoglobin, fetal hemoglobin and myoglobin.
  • Describe how carbon dioxide is carried by the blood. [Include action of carbonic anhydrase, chloride shift, and plasma proteins]
  • Explain the role of the Bohr shift in the supply of oxygen to respiring tissues.
  • Explain how and why ventilation rate varies with exercise.
  • Outline the possible causes of asthma and its effects on the gas exchange system.
  • Explain the problem of gas exchange at high altitudes and the way the body acclimatizes.

Researching the eye

Monday, April 12th, 2010

Now that we know what about the structure and function of the eye, let’s try and answer these questions:-

  • How do optical illusions (such as Optical Illusions) work?
  • Explain the evolution of the eye.
  • Compare the eyes of predators with those of their prey.
  • What is stereoscopic vision and how does it help animals survive?

Get into groups of 3 or 4.  Each person in your group should choose one question to research and answer.  Spend about 30 mins on this.  Come back together as a group and share your answers with each other.  Once each member of the group has responded, write down at least 2 follow-up questions for each topic, then try and answer those.

H5 Transport system

Monday, April 12th, 2010
Cardiac_cycle_pressure_only from wikimedia

Cardiac_cycle_pressure_only from wikimedia

Take another look at your notes on blood, blood vessels and the heart from topic 6.  Re-learn your heart diagram.  There is some new vocab to get your head around in this section.  I have highlighted these terms below.  Use this presentation to help you.

 

  • Explain the events of the cardiac cycle. [Talk about atrial and ventricular systole and diastole, and heart sounds]
  • Analyse data showing pressure and volume changes in the left atrium, left ventricle and aorta during the cardiac cycle.
  • Outline the mechanisms that control heartbeat. [Include role of sinoatrial (SA) node, atrioventricular (AV) node and conducting fibres in the ventricular walls]
  • Outline atherosclerosis and the causes of coronary thrombosis.
  • Discuss factors that affect the incidence of CHD (coronary heart disease).

Digestion and absorption of digested foods

Thursday, April 8th, 2010
Ileum (3) by GreenFlames09 on flickr

Ileum (3) by GreenFlames09 on flickr

H2 – digestion.  We’ve done the basics, and because you ask good questions, we’ve gone further, so much of this you will have some idea about already.  You have the background, now we need to fill in the details.  Click here.

  • State that digestive juices are secreted into the alimentary canal by glands, including salivary glands, gastric glands in the stomach wall, the pancreas and the wall of the small intestine.
  • Explain the structural features of exocrine gland cells.
  • Compare the chemical composition of saliva, gastric juice and pancreatic juice.
  • Outline the control of digestive juice secretion by nerves and hormones, using the example of secretion by gastric juice.
  • Outline the role of membrane-bound enzymes on the surface of epithelial cells in the small intestine in digestion.
  • Outline the reasons for cellulose not being digested in the alimentary canal.
  • Explain why pepsin and trypsin are initially synthesized as inactive precursors and how they are subsequently activated.
  • Discuss the roles of gastric acid and Helicobacter pylori in the development of stomach ulcers and stomach cancers.
  • Explain the problem of lipid digestion in a hydrophilic medium and the role of bile in overcoming this.

 H3 – absorption of digested foods.  This is a short section, much of which we’ve covered before.  Click here. You need to be able to:-

  • Draw and label a diagram showing a transverse section of the ileum as seen under a light microscope.
  • Explain the structural features of an epithelial cell of a villus as seen in electron micrographs, including microvilli, mitochondria, pinocytotic vesicles and tight junctions.
  • Explain the mechanisms used by the ileum to absorb and transport food, including facilitated diffusion, active transport and endocytosis.
  • List the materials that are not absorbed and are egested.

Eye see

Thursday, April 8th, 2010

We’ll take a look (ha ha) at the structure of the eye, and learn how it captures light waves so that we can see.  Eye-diagram  We’ll be able to identify the parts by name and also explain their function.  We’ll understand how the eye is like a camera, and we’ll do an eye dissection.