Question

1. osmosis is the of across a 2. in which direction does water move across membranes, up or down the concentration gradient? it moves the concentration gradient from a concentration to a concentration. 3. use arrows to show the direction of water movement into or out of each cell. label each picture as having an isotonic environment, hypotonic environment, and hypertonic environment to the cell. 4. each red blood cell is surrounded by a solution. label each solution as isotonic, hypotonic, or hypertonic (pay attention to the movement of the water): 5. each plant cell is surrounded by a solution. label each solution as isotonic, hypotonic, or hypertonic (pay attention to the movement of the water):

Explanation:

Step1: Define osmosis

Osmosis is the diffusion of water across a semi - permeable membrane.

Step2: Determine water movement direction

Water moves down the concentration gradient from a high water concentration to a low water concentration.

Step3: Analyze cell - environment water relations

For the first cell environment (95% water outside, 98% water inside cell): Water moves out of the cell, it is a hypertonic environment. For the second cell environment (98% water outside, 98% water inside cell): No net water movement, it is an isotonic environment. For the third cell environment (100% water outside, 98% water inside cell): Water moves into the cell, it is a hypotonic environment.

Step4: Analyze red - blood - cell solutions

In the first red - blood - cell image, water moves out, it is a hypertonic solution. In the second red - blood - cell image, no net water movement, it is an isotonic solution. In the third red - blood - cell image, water moves out, it is a hypertonic solution.

Step5: Analyze plant - cell solutions

In the first plant - cell image, water moves into the cell, it is a hypotonic solution. In the second plant - cell image, no net water movement, it is an isotonic solution. In the third plant - cell image, water moves out, it is a hypertonic solution.

Answer:

1. diffusion; water; semi - permeable membrane
2. down; high; low
3. First cell: Hypertonic, arrow out of cell. Second cell: Isotonic, no net arrow. Third cell: Hypotonic, arrow into cell.
4. First: Hypertonic. Second: Isotonic. Third: Hypertonic.
5. First: Hypotonic. Second: Isotonic. Third: Hypertonic.