Paper 1: Required Practicals Flashcards
(16 cards)
What is the aim of the microscopy practical?
To investigate the structure of plant and animal cells using a light microscope.
What is the method for the microscopy practical?
Prepare a slide with cells (e.g., onion epidermis), use a light microscope, and count cells under different magnifications.
What is the first step in preparing a slide for microscopy?
Cut a thin slice of the specimen and place it on a glass slide.
How do you calculate magnification in the microscopy practical?
Magnification = eyepiece lens magnification × objective lens magnification.
What is the aim of the osmosis practical?
To investigate the effect of solute concentration on the rate of osmosis in plant tissue.
What is the method for the osmosis practical?
Cut potato cylinders and place them in solutions with varying concentrations of salt/sucrose. Measure changes in mass.
What is the expected result for osmosis in the potato cylinders?
Potato cylinders in higher solute concentrations lose mass (water moves out), and those in lower concentrations gain mass.
What is the aim of the photosynthesis practical?
To investigate the effect of light intensity on the rate of photosynthesis.
What is the method for the photosynthesis practical?
Use a water plant (e.g., Elodea) in water and measure oxygen production in different light intensities (vary distance from light source).
What is the result of increasing light intensity in the photosynthesis practical?
Increased light intensity increases the rate of photosynthesis (more oxygen produced).
What is the aim of the enzyme practical?
To investigate the effect of pH on the rate of enzyme activity.
What is the method for the enzyme practical?
Use an enzyme (e.g., amylase) to break down starch at different pH levels. Use iodine solution to test for the presence of starch.
What is the expected result in the enzyme practical?
Enzyme activity is highest at the optimum pH, and decreases at more acidic or alkaline pH.
What is the aim of the respiration practical?
To investigate the effect of temperature on the rate of respiration in yeast.
What is the method for the respiration practical?
Place yeast in sugar solution at different temperatures. Measure the amount of carbon dioxide produced.
What is the expected result for the respiration practical?
Yeast produces more carbon dioxide at higher temperatures, up to the optimum temperature.
