Required Practicals Flashcards
What do you do in the photosynthesis investigation to measure light intensity?
“Place a lamp at different distances from the pondweed and count oxygen bubbles or measure oxygen volume with a gas syringe.”
What steps do you follow in the reaction time investigation?
“1. Person A holds a ruler at 0 cm. 2. Person B catches it when dropped. 3. Record the distance the ruler falls. 4. Repeat and calculate the mean.”
How do you set up the pondweed practical to test photosynthesis?
“Place pondweed in a beaker of water, shine a light at it, and measure oxygen production (bubbles or gas syringe).”
What do you do in the quadrat investigation to estimate population size?
“1. Randomly place quadrats in the habitat. 2. Count the number of organisms in each quadrat. 3. Calculate population size using: (Total area ÷ Area sampled) × Number of organisms.”
How do you ensure accuracy in the reaction time investigation?
“Repeat the test multiple times, calculate the mean, and use the same person to drop the ruler each time.”
What do you do in the quadrat investigation to make sure your sample is representative?
Use random sampling (e.g., random number generator) and sample enough quadrats to reduce the effect of anomalies.
