Question

osmosis is the movement of water from high water concentration to low water concentration across a semi permeable membrane.
model 2 - osmosis in plant and animal cells

1. using your knowledge of cells, which type of cells in model 2—animal or plant—have

a. a selectively permeable membrane?
b. a permeable, rigid cell wall?

1. the arrows in model 2 show movement of water into and out of the cells. what does the thickness of the arrow indicate?

Explanation:

For question 11a: Both animal and plant cells have a selectively permeable membrane (cell membrane for animal, cell membrane within the cell wall for plant). For 11b: Only plant cells have a permeable, rigid cell wall (animal cells lack a cell wall). For question 12: The thickness of the arrow indicates the relative rate of water movement (thicker arrow means more water moving in that direction, e.g., in hypertonic for animal cell, thicker arrow out; in hypotonic for plant cell (turgid), thicker arrow in, showing net water movement direction and magnitude).

Answer:

11a. Animal and Plant Cells
11b. Plant Cells

1. The thickness of the arrow indicates the relative rate (or amount) of water movement into or out of the cell (thicker arrow = greater net movement in that direction).