Biology 7.3 and 7.4 WS KEY | PDF | Osmosis | Cell (Biology) - Free Printable

The image you provided is a vocabulary-building exercise related to diffusion and osmosis in biology. The task involves completing a chart by writing sentences that help remember the meaning of each term. Below, I will explain the solution for each term and provide example sentences.

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Terms and Definitions

1. Diffusion
- Definition: Movement of particles from an area of higher concentration to an area of lower concentration.
- Sentence: "When you open a bottle of perfume, the scent molecules diffuse through the air, spreading from the bottle to the surrounding environment."

2. Substances diffuse across a permeable membrane
- Definition: Facilitate movement of substances through a membrane.
- Sentence: "Water can diffuse across a permeable membrane because it can pass through the tiny pores in the membrane."

3. Hypertonic solution
- Definition: Solution with solute concentration greater than another solution.
- Sentence: "If you place a cell in a hypertonic solution, water will move out of the cell because the solution outside has more solute."

4. Hypotonic solution
- Definition: Solution with solute concentration less than another solution.
- Sentence: "Placing a cell in a hypotonic solution causes water to move into the cell because the solution inside the cell has more solute."

5. Isotonic solution
- Definition: Two solutions that have the same amount of solute.
- Sentence: "In an isotonic solution, there is no net movement of water between the cell and its surroundings because the solute concentrations are equal."

6. Osmosis
- Definition: Diffusion of water across a semipermeable membrane.
- Sentence: "Osmosis occurs when water moves through a cell membrane from an area of low solute concentration to an area of high solute concentration."

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Explanation of Each Term

1. Diffusion: This is the passive movement of particles (like gases, liquids, or solutes) from an area of higher concentration to an area of lower concentration until equilibrium is reached. It does not require energy and happens naturally due to random molecular motion.

2. Permeable membrane: A membrane that allows certain substances to pass through it. For example, water can pass through a permeable membrane, but larger molecules like proteins may not.

3. Hypertonic solution: A solution with a higher concentration of solute compared to another solution. When a cell is placed in a hypertonic solution, water moves out of the cell to balance the solute concentration, causing the cell to shrink (a process called crenation).

4. Hypotonic solution: A solution with a lower concentration of solute compared to another solution. When a cell is placed in a hypotonic solution, water moves into the cell to balance the solute concentration, causing the cell to swell (and potentially burst, a process called lysis).

5. Isotonic solution: A solution with the same concentration of solute as another solution. In this case, there is no net movement of water across the membrane, so the cell maintains its normal size.

6. Osmosis: Specifically refers to the diffusion of water across a semipermeable membrane. It is driven by the difference in solute concentration on either side of the membrane. Water always moves from an area of lower solute concentration to an area of higher solute concentration.

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Final Answer

Here is the completed chart with example sentences:

| Term | Definition | Sentence |
|------------------------|-------------------------------------------------------------------------------|------------------------------------------------------------------------------|
| Diffusion | Movement of particles from an area of higher concentration to an area of lower concentration. | When you open a bottle of perfume, the scent molecules diffuse through the air, spreading from the bottle to the surrounding environment. |
| Substances diffuse across a permeable membrane | Facilitate movement of substances through a membrane. | Water can diffuse across a permeable membrane because it can pass through the tiny pores in the membrane. |
| Hypertonic solution | Solution with solute concentration greater than another solution. | If you place a cell in a hypertonic solution, water will move out of the cell because the solution outside has more solute. |
| Hypotonic solution | Solution with solute concentration less than another solution. | Placing a cell in a hypotonic solution causes water to move into the cell because the solution inside the cell has more solute. |
| Isotonic solution | Two solutions that have the same amount of solute. | In an isotonic solution, there is no net movement of water between the cell and its surroundings because the solute concentrations are equal. |
| Osmosis | Diffusion of water across a semipermeable membrane. | Osmosis occurs when water moves through a cell membrane from an area of low solute concentration to an area of high solute concentration. |

Boxed Final Answer:
\boxed{
\begin{array}{|c|c|c|}
\hline
\textbf{Term} & \textbf{Definition} & \textbf{Sentence} \\
\hline
\text{Diffusion} & \text{Movement of particles from an area of higher concentration to an area of lower concentration.} & \text{"When you open a bottle of perfume, the scent molecules diffuse through the air, spreading from the bottle to the surrounding environment."} \\
\hline
\text{Substances diffuse across a permeable membrane} & \text{Facilitate movement of substances through a membrane.} & \text{"Water can diffuse across a permeable membrane because it can pass through the tiny pores in the membrane."} \\
\hline
\text{Hypertonic solution} & \text{Solution with solute concentration greater than another solution.} & \text{"If you place a cell in a hypertonic solution, water will move out of the cell because the solution outside has more solute."} \\
\hline
\text{Hypotonic solution} & \text{Solution with solute concentration less than another solution.} & \text{"Placing a cell in a hypotonic solution causes water to move into the cell because the solution inside the cell has more solute."} \\
\hline
\text{Isotonic solution} & \text{Two solutions that have the same amount of solute.} & \text{"In an isotonic solution, there is no net movement of water between the cell and its surroundings because the solute concentrations are equal."} \\
\hline
\text{Osmosis} & \text{Diffusion of water across a semipermeable membrane.} & \text{"Osmosis occurs when water moves through a cell membrane from an area of low solute concentration to an area of high solute concentration."} \\
\hline
\end{array}
}