Osmosis in Plant and Animal Cells

Using our knowledge of cells, which type of cells in Model 1 - animal or plant - have a selectively permeable membrane?

The arrows in Model 1 show movement of water into and out of the cells. What does the thickness of the arrow indicate?

For each question, use diagrams A-F in Model 1. Which cells show a net increase in water? a. a net decrease in water? c. no net change in water?

Consider the definition for osmosis and the net movement of water from a dilute solution (high concentration of water) to a concentrated solution (low concentration of water). a. Describe the concentration of the solutions surrounding cells A and D (extracellular), relative to the concentration of the solution inside cells A and D (intracellular). b. Describe the concentration of the extracellular solution of cells C and F, relative to the intracellular solution of cells C and F. c. Describe the concentration of the extracellular solution of cells B and E, relative to the concentration of the intracellular solution of cells B and E.

Using the diagrams in Model 1 and the answers to the previous question, develop definitions for the following words. a. A hypertonic extracellular solution is _________. b. A hypotonic extracellular solution is _________. c. An isotonic extracellular solution is _________.

Consider the cells in Model 1 that are in hypertonic solutions. a. Describe what has happened to the plant cell. b. What word is used to summarize these changes to the plant cell? c. What word would be used if the cell were from an animal?

Consider the cells in Model 1 that are in hypotonic solutions. a. Describe the changes to the plant cell. b. What word summarizes these changes to the plant cell? c. What word would be used if the cell were from an animal?

When animal cells are in a hypotonic solution they can undergo lysis. Here, plant cells do not, they only become turgid. a. Define lysis based on the diagram in Model 1. b. What structure on the plant cell prevents lysis from occurring in a hypotonic solution?