Diffusion Osmosis and Active Transport Worksheet F2020 - Name ... - Free Printable

Worksheet: Diffusion, Osmosis, and Active Transport

#### 1. Which type(s) of transport is each statement true for? Add ticks to the correct boxes.

| Statement | Diffusion | Osmosis | Active Transport |
|---------------------------------------------------------------------------|---------------|--------------|----------------------|
| A substance moves from an area of low concentration to an area of high concentration. | | | ✓ |
| Can happen in living cells. | ✓ | ✓ | ✓ |
| A substance moves and becomes more evenly spread out. | ✓ | ✓ | |
| The movement does not use energy and is caused by the random movement of individual particles. | ✓ | ✓ | |
| The movement requires energy from respiration. | | | ✓ |
| Only water is involved in this type of movement. | | ✓ | |
| Water moves from a less concentrated solution to a more concentrated solution. | | ✓ | |

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#### Explanation for Each Statement:

1. A substance moves from an area of low concentration to an area of high concentration.
- Active Transport: This is the only process where substances move against their concentration gradient (from low to high concentration). It requires energy.
- Diffusion and Osmosis: These processes involve movement from high to low concentration.

2. Can happen in living cells.
- Diffusion, Osmosis, and Active Transport: All three processes can occur in living cells. Diffusion and osmosis are passive processes, while active transport requires cellular energy.

3. A substance moves and becomes more evenly spread out.
- Diffusion and Osmosis: Both processes result in the even distribution of molecules or solutes across a membrane.
- Active Transport: Does not necessarily lead to even distribution, as it involves moving substances against their concentration gradient.

4. The movement does not use energy and is caused by the random movement of individual particles.
- Diffusion and Osmosis: Both are passive processes driven by the random motion of particles (Brownian motion).
- Active Transport: Requires energy from ATP, so it is not included here.

5. The movement requires energy from respiration.
- Active Transport: Requires energy derived from cellular respiration (ATP).
- Diffusion and Osmosis: Are passive processes and do not require energy.

6. Only water is involved in this type of movement.
- Osmosis: Specifically refers to the movement of water molecules across a semipermeable membrane.
- Diffusion and Active Transport: Involve the movement of various substances, not just water.

7. Water moves from a less concentrated solution to a more concentrated solution.
- Osmosis: Water always moves from a less concentrated solution (higher water potential) to a more concentrated solution (lower water potential).
- Diffusion and Active Transport: Do not specifically describe water movement in this context.

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#### 2. Choose a word from the box at the bottom of the page to fill in the gaps in the sentences below. You can use words once, twice, or not at all.

The words to choose from are:
- Diffuses
- Respiration
- Carbon dioxide
- Osmosis
- Semi-permeable membranes
- Active Transport
- Energy

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##### Sentences:

1. In animals, oxygen ………… diffuses into cells across cell membranes to be used in ………… respiration. Carbon dioxide ………… diffuses out of cells.
- In animals, oxygen diffuses into cells across cell membranes to be used in respiration. Carbon dioxide diffuses out of cells.

2. In plants, carbon dioxide diffuses into cells to be used in Photosynthesis.
- This sentence is already complete. No changes needed.

3. Water enters the roots of plants by ………… osmosis. Water moves into cells through ………… semi-permeable membranes, which allow small molecules, such as water, to pass through, but not large molecules. Plants use a process called ………… active transport to move minerals such as nitrates into root cells. This requires ………… energy.
- Water enters the roots of plants by osmosis. Water moves into cells through semi-permeable membranes, which allow small molecules, such as water, to pass through, but not large molecules. Plants use a process called active transport to move minerals such as nitrates into root cells. This requires energy.

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#### Final Answer:

1. Completed Table:
| Statement | Diffusion | Osmosis | Active Transport |
|---------------------------------------------------------------------------|---------------|--------------|----------------------|
| A substance moves from an area of low concentration to an area of high concentration. | | | ✓ |
| Can happen in living cells. | ✓ | ✓ | ✓ |
| A substance moves and becomes more evenly spread out. | ✓ | ✓ | |
| The movement does not use energy and is caused by the random movement of individual particles. | ✓ | ✓ | |
| The movement requires energy from respiration. | | | ✓ |
| Only water is involved in this type of movement. | | ✓ | |
| Water moves from a less concentrated solution to a more concentrated solution. | | ✓ | |

2. Filled-in Sentences:
- In animals, oxygen diffuses into cells across cell membranes to be used in respiration. Carbon dioxide diffuses out of cells.
- In plants, carbon dioxide diffuses into cells to be used in Photosynthesis.
- Water enters the roots of plants by osmosis. Water moves into cells through semi-permeable membranes, which allow small molecules, such as water, to pass through, but not large molecules. Plants use a process called active transport to move minerals such as nitrates into root cells. This requires energy.

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#### Final Answer Box:
\boxed{
\begin{array}{l}
\text{1. Completed Table as above.} \\
\text{2. Filled-in Sentences as above.}
\end{array}
}