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Develop a hypothesis Research Plan a practical Collect data to draw a conclusion Analyse results

Develop a hypothesis Research Plan a practical Collect data to draw a conclusion Analyse results. YOU NEED TO: Investigate whether the distribution of stomata is dependent on being on the top or bottom surface of a leaf. Water is lost through leaves

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Develop a hypothesis Research Plan a practical Collect data to draw a conclusion Analyse results

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  1. Develop a hypothesis • Research • Plan a practical • Collect data to draw a conclusion • Analyse results

  2. YOU NEED TO: Investigate whether the distribution of stomata is dependent on being on the top or bottom surface of a leaf.

  3. Water is lost through leaves • By evaporation in process called transpiration • Through holes in leaf called stomata

  4. Stomata can open and close. Water is lost through the stomata. More evaporation occurs in winds. More evaporation occurs when the temperature increases.

  5. Independent variable: Surface of leaf – top or bottom Dependent variable: Number of stomata

  6. Why this hypothesis? Because I have learned in class/seen in a textbook that… • Prediction? • Scientific reason why stomata are not found equally on top & bottom?

  7. The method question: In this question you will be assessed on using good English, organising information clearly and using specialist terms where appropriate. From this research that you have done, describe in detail how you are going to do your investigation. You should include: • The equipment you are going to use • How you will use the equipment • The measurements you are going to make • How you will make it a fair test • A risk assessment

  8. Q3 – Method (9 marks out of 20) • All the necessary equipment is stated • How to use the equipment is clearly explained • Describe the method from start to finish in step-by-step detail • Measurements are stated • Control variables are identified along with details of how they will be controlled • Significant hazards are identified with an assessment of the degree of risk and measures taking to reduce these • Answer is coherent and written in a logical sequence • Answer uses relevant specialist terms • Faultless spelling, punctuation and grammar

  9. Q3 – Method (9 marks out of 20) • All the necessary equipment is stated • How to use the equipment is clearly explained • Describe the method from start to finish in step-by-step detail • Measurements are stated • Control variables are identified along with details of how they will be controlled • Significant hazards are identified with an assessment of the degree of risk and measures taking to reduce these • Answer is coherent and written in a logical sequence • Answer uses relevant specialist terms • Faultless spelling, punctuation and grammar

  10. Q3 – Method (9 marks out of 20) • All the necessary equipment is stated • How to use the equipment is clearly explained • Describe the method from start to finish in step-by-step detail • Measurements are stated • Control variables are identified along with details of how they will be controlled • Significant hazards are identified with an assessment of the degree of risk and measures taking to reduce these • Answer is coherent and written in a logical sequence • Answer uses relevant specialist terms • Faultless spelling, punctuation and grammar

  11. Why the sources? Make a choice about the most useful one… • Identify 2 sources you have used in your research. • Identify the MOST useful source from these and give one reason why this was useful. • Give one reason why the other source was less useful. Even if not directly asked to do so, you MUST comment on both sources for full marks.

  12. Has a risk assessment  • Gives me a good idea about what my control variables should be  • Gives me an idea about what values my control variables should be  • Doesn’t have a risk assessment  • Method uses equipment I don’t have  • The independent variable being tested is not the same as what I want to test 

  13. Be exact – species of plant, how many leaves & where to position the nail varnish • Be clear about which surface to paint the nail varnish and think about explaining how make sure results are not mixed up i.e. top/bottom • The grid is clear cellophane printed with a 1mm² grid and this is placed over the nail varnish – you must explain this as it needs to be made you can’t just buy it • mm² not MM² • Count the number of stomata only in a single 1mm² square – you can only do this on x40 magnification • How to explain repeating the experiment – for top and bottom and for different species • Control variables are only controls if they would otherwise affect the results so e.g. thickness of nail varnish is NOT one • Get each stage in the right order • Paragraph! No bullet points!

  14. Fill in your notes sheet… Research Sources Full web addresses of the two most useful sources and in brackets a key word to remind yourself about what was useful the source. Method Bullet point brief notes you will need to help you write out a full method – keep the bullet points in the correct order. Equipment List your equipment – including quantities. Risk assessment Risk assessments – what are the risks? What will you do to minimise them?

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