The following diagram demonstrates a physiological process taking place in green plants (a funnel and test tube inverted over Hydrilla in a beaker of water). The whole set up was placed in bright sunlight for several hours. Study the diagram and answer the questions that follow: The following diagram demonstrates a physiological process taking place in green plants (a funnel and test tube inverted over Hydrilla in a beaker of water). The whole set up was placed in bright sunlight for several hours. Study the diagram and answer the questions that follow:
Label the parts numbered 1 and 2 in the diagram.
Topic: Parts of the Hydrilla experiment
Answer
1 — OXYGEN (the gas collected at the top of the test tube) 2 — HYDRILLA PLANT
WHY HYDRILLA IS USED, since the question names it: it is an AQUATIC plant, so the gas it gives off rises through the water as visible BUBBLES and can be collected. A land plant would release its oxygen invisibly into the air.
The funnel CHANNELS the bubbles upward and the inverted test tube TRAPS them, so the gas accumulates where it can be tested.
Note that the funnel is usually raised slightly on a support to keep it off the bottom, so water can circulate beneath it.