The distance between the light source (lamp) and the apparatus (with a waterplant) was changed at regular intervals, recording the number of bubblesreleased by the water plant at each distance.The results are shown in the table below.Distance betweenlamp and plant(mm)40 80 120 160 200 240 280 320 360Bubbles formedper minute 32 30 28 25 15 10 5 3 0Question 2.3.1 [4 marks]For the above investigation, state:(a) The dependent variable(b) How the dependent variable was measured(c) The independent variable(d) How the independent variable was variedQuestion 2.3.2 [1 mark]State the function of sodium bicarbonate in this investigation.Question 2.3.3 [1 mark]State ONE way in which the reliability of the investigation could be increased.Question 2.3.4 [8 marks]Plot a line graph to represent the data obtained during this investigation.[14 marks]12

The apparatus shown in the diagram can be used to measure the change in rate of photosynthesis in pondweed when the lamp is moved closer or further away from the pondweed. What would change to cause an increase or decrease in that rate?

You water three sunflower plants with salt water. Each plant receives a different concentration of salt solutions. Finally, a fourth plant receives pure water. After two weeks, the height is measured. Based on the given situation, which of these was the independent variable in this experiment?a.height of plantsb.type of plantc.amount of salt solutionsd.amount of water

Part 1: Data Presentation Use the data in the table below to complete the graph provided. Number of Bubbles (per min) Depth (in metres) Plant A Plant B 2 29 5 36 21 10 27 45 16 40 32 25 50 20 30 34 10 Answer the following questions based on the graph above you just completed. 1. What is the independent variable? 20 _________________________________________________________________________________ 2. Why is this the independent variable? _________________________________________________________________________________ 3. What is the dependent variable? _________________________________________________________________________________ 4. Why is this the dependent variable? _________________________________________________________________________________ 5. Use one or more complete sentences to state a conclusion about the data in the graph. _________________________________________________________________________________ _________________________________________________________________________________ _________________________________________________________________________________ _________________________________________________________________________________ _________________________________________________________________________________ _________________________________________________________________________________

In an experiment, a researcher manipulates the amount of sunlight plants receive and measures their growth. What is the manipulated variable (independent variable) in this study?Group of answer choicesTimeAmount of sunlightTemperaturePlant growth

An experiment was conducted to determine how quickly water would move from one area to another through the process of osmosis.Six different concentrations of sucrose were placed in identical containers, with the same volume of solution in each. The containers allowed water to pass through, but nothing else. Containers were placed in equal volumes of water. The containers sat in the solution for 30 minutes. The initial and final masses of the containers were taken, and a percent change in mass was calculated to determine how much water entered the tubing during the 30-minute time period.What is the independent, dependent, and control variable in the experiment?Elimination ToolSelect one answerAIndependent Variable Dependent Variable ControlPercent Change in Mass Concentrations of Sucrose ContainersBIndependent Variable Dependent Variable ControlConcentrations of Sucrose Percent Change in Mass ContainersCIndependent Variable Dependent Variable ControlConcentrations of Sucrose Containers Percent Change in MassDIndependent Variable Dependent Variable ControlContainers Concentrations of Sucrose Percent Change in Mass