A student is investigating the effect of light intensity on photosynthesis in pondweed. Which of these pieces of equipment will they need? Select all correct answers Microscope Test tube Voltmeter Lamp Stopwatch Burette Ruler

<br /><br />To investigate the effect of light intensity on photosynthesis in pondweed, the student needs several pieces of laboratory equipment. The correct pieces include:<br /><br />1. Pondweed: It is the specimen which will be studied.<br /><br />2. Lamp: It is an artificial source of light for the pondweed, whose intensity can be changed by adjusting the distance between the pondweed and these, to explore the varying intensity's effect on photosynthesis utilising the inverse square law.<br /><br />3. Test tube: To secure the axis of setup maintaining plant in the center.<br /><br />4. Stopwatch: To measure accurately the time taken, which is usually mandatory in time based experiments. In this, the student could use a stopwatch to measure intervals in which oxygen bubbles are released from the pondweed under varying light intensity.<br /><br />5. Ruler: To keep uniform distance between the light source(Lamp) and the plant in order to ensure consistent intensity of light; utilizing the inverse square rule - as distance induced increase or decrease can considerably affect light intensity and deviate aim of the experiment testing.<br /><br />Nonevasive equipments - Microscope, Voltmeter, Burette - Doesn't aids in this experimental setup as they won't contribute any substantial informational data. Microscope doesn't provide any considerable data, a voltmeter isn't applicable here because electronic measures doesn't prevail and, burette is required where dropping content which too doesn't fall under our tested variables.<br /><br />So, the correct answers would be a "Lamp", "Stopwatch", "Test Tube", and "Ruler".