Start Relative dating lab answers

Relative dating lab answers

Note from a Teacher: I am a veteran teacher of 24 years who teaches in a dual language program.

You must focus up and down using the fine adjustment knob on the microscope to see both layers of cells.: Shrinkage of the protoplast or cell contents due to water loss when a drop of salt water (Na Cl) is added to the Elodea slide.

Because of all the salt ions (Na and Cl- ions) outside the cell membrane of each Elodea cell, water molecules move out of the cell membrane causing the cell membrane and it contents to shrink into a blob in the center of the cell wall.

Only one layer of cells is in focus when using the high power (40x) objective.

Therefore, the depth of field is limited to only one layer of cells.

: When using a compound microscope this term refers to the thickness of the subject that is in focus.

The Elodea leaf is composed of two layers of cells.

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The porous, cellulose wall does not shrink because the salt ions easily pass through the wall but cannot pass through the membrane.

Therefore, the cell membrane (not the cell wall) loses water molecules and shrinks.: When comparing two solutions, such as the inside of a red blood cell (RBC) with the solution they are placed in, the solution with the greater salt concentration is hypertonic, while the solution with the lower salt concentration is hypotonic.

Archaeology and other human sciences use radiocarbon dating to prove or disprove theories.