A biology student was given threeunlabeled jars of pond water from the same source, each containing a different type of mobile unicellular organism: euglena, ameba, and paramecium. The only information the student has is that the ameba and paramecium are both heterotrophs and the euglena can be either heterotrophic or autotrophic, depending on its environment.
Which procedure and resulting observation would help identify the jar that contains the euglena?
1. Expose only one side of each jar to light. After 24 hours, only in the jar containing euglena will most of the organisms be seen on the darker side of the jar.
2. Expose all side of each jar to light. After 48 hours, the jar with the highest dissolved carbon dioxide content will contain the euglena.
3. Over a period of one week, determine the method of reproduction used by each type of organism. If mitotic cell division is observed, the jar will contain euglena.
4. Prepare a wet-mount slide of specimens from each jar and observe each slide with a compound light microscope. Only the euglena will have cholorplasts.
Could someone please tell me which it is and why? I have to answer this for biology homework but we haven't learned about this yet.
Which procedure and resulting observation would help identify the jar that contains the euglena?
1. Expose only one side of each jar to light. After 24 hours, only in the jar containing euglena will most of the organisms be seen on the darker side of the jar.
2. Expose all side of each jar to light. After 48 hours, the jar with the highest dissolved carbon dioxide content will contain the euglena.
3. Over a period of one week, determine the method of reproduction used by each type of organism. If mitotic cell division is observed, the jar will contain euglena.
4. Prepare a wet-mount slide of specimens from each jar and observe each slide with a compound light microscope. Only the euglena will have cholorplasts.
Could someone please tell me which it is and why? I have to answer this for biology homework but we haven't learned about this yet.