Active and Passive Transport Worksheet with interactive activities and educational content.

The worksheet focuses on the concepts of Active and Passive Transport in cells. Below, I will solve each question step by step and explain the reasoning.

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Q1. Write True (T) or False (F) if the statement is true, write False (F) if the statement is false.

#### a. All cells have a cell membrane.
- True (T): All cells are enclosed by a cell membrane, which regulates what enters and exits the cell.

#### b. All molecules are always in motion.
- True (T): Molecules are in constant motion due to kinetic energy, even at room temperature.

#### c. When equilibrium is reached in diffusion, the movement of particles stops across the cell membrane.
- False (F): At equilibrium, the net movement of particles stops, but individual particles continue to move randomly.

#### d. In passive transport, particles always move from areas of higher concentration to areas of lower concentration without the use of energy.
- True (T): Passive transport relies on concentration gradients and does not require energy.

#### e. Active transport does not require energy to proceed.
- False (F): Active transport requires energy (usually ATP) to move substances against their concentration gradient.

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Q2. Use the words in the box to label terms in the model illustrated below.

The diagram shows three types of transport:
1. Facilitated Diffusion: Movement of molecules through a carrier protein down a concentration gradient.
2. Active Transport: Movement of molecules against a concentration gradient using energy (ATP).
3. Passive Transport: General term for movement down a concentration gradient without energy.

- Labeling:
- Left panel: Facilitated Diffusion
- Middle panel: Active Transport
- Right panel: Passive Transport

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Q3. Which of the following is not a type of passive transport?

- a) Diffusion
- b) Facilitated Diffusion
- c) Endocytosis
- d) Osmosis

#### Explanation:
- Diffusion, Facilitated Diffusion, and Osmosis are all types of passive transport because they rely on concentration gradients and do not require energy.
- Endocytosis is an active process that involves the cell consuming material by engulfing it, requiring energy.

- Answer: c) Endocytosis

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Q4. Which of the following substances cannot pass through the cell membranes by simple diffusion?

- a) Glucose
- b) Oxygen
- c) Carbon dioxide
- d) Water

#### Explanation:
- Oxygen, Carbon dioxide, and Water are small, nonpolar molecules that can pass through the lipid bilayer of the cell membrane by simple diffusion.
- Glucose is a large, polar molecule and cannot pass through the membrane by simple diffusion. It requires facilitated diffusion or active transport.

- Answer: a) Glucose

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Q5. Which of the following statements about the cell membrane is false?

- a) It is made up of a phospholipid bilayer.
- b) It is selectively permeable, allowing certain substances to enter and leave.
- c) It surrounds the cytoplasm of the cell and regulates what enters and exits the cell.
- d) All the movement of particles across the cell membrane requires energy.

#### Explanation:
- a) True: The cell membrane is composed of a phospholipid bilayer.
- b) True: The cell membrane is selectively permeable.
- c) True: The cell membrane surrounds the cytoplasm and regulates substance movement.
- d) False: Only active transport requires energy; passive transport does not.

- Answer: d) All the movement of particles across the cell membrane requires energy.

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Q6. The diagram shows the movement of dye particles across a membrane over time. Which type of transport occurs in the diagram shown above?

- a) Facilitated Diffusion
- b) Diffusion
- c) Endocytosis
- d) Exocytosis

#### Explanation:
- The diagram shows dye particles moving from a high concentration to a low concentration across the membrane, which is characteristic of diffusion.

- Answer: b) Diffusion

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Q7. Which one of the following terms is defined as the movement of molecules from high concentration to lower concentration through transport proteins in the cell membrane without using energy?

- a) Facilitated Diffusion
- b) Diffusion
- c) Endocytosis
- d) Osmosis

#### Explanation:
- Facilitated Diffusion involves the movement of molecules down a concentration gradient with the help of transport proteins but without energy.
- Diffusion is the general term for movement down a concentration gradient without proteins.
- Endocytosis is an active process.
- Osmosis is the movement of water across a semipermeable membrane.

- Answer: a) Facilitated Diffusion

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Q8. Which one of the following is defined as the diffusion of water through a selectively permeable membrane?

- a) Exocytosis
- b) Endocytosis
- c) Homeostasis
- d) Osmosis

#### Explanation:
- Osmosis specifically refers to the movement of water across a selectively permeable membrane.

- Answer: d) Osmosis

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Q9. Which of the following statements about active transport is false?

- a) In active transport, particles move against the concentration gradient.
- b) Energy is required in active transport.
- c) In active transport, particles move from higher concentration to lower concentration.
- d) The sodium-potassium pump is an example of active transport.

#### Explanation:
- a) True: Active transport moves particles against the concentration gradient.
- b) True: Active transport requires energy (usually ATP).
- c) False: Active transport moves particles from lower concentration to higher concentration (against the gradient).
- d) True: The sodium-potassium pump is a classic example of active transport.

- Answer: c) In active transport, particles move from higher concentration to lower concentration.

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Q10. Which one of the following terms is defined as the ability to maintain a stable internal condition?

- a) Diffusion
- b) Endocytosis
- c) Homeostasis
- d) Osmosis

#### Explanation:
- Homeostasis refers to the maintenance of a stable internal environment within an organism or cell.

- Answer: c) Homeostasis

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Q11. What type of transport occurs during the gas exchange (respiration) in the lungs?

- a) Diffusion
- b) Endocytosis
- c) Homeostasis
- d) Osmosis

#### Explanation:
- Gas exchange in the lungs occurs via diffusion, where oxygen moves from the alveoli into the blood and carbon dioxide moves from the blood into the alveoli.

- Answer: a) Diffusion

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Q12. The rate of diffusion _______ as the temperature increases.

- a) decreases
- b) does not change
- c) increases

#### Explanation:
- As temperature increases, the kinetic energy of molecules increases, leading to faster diffusion.

- Answer: c) increases

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Crossword Puzzle (Partial Solution)

Here are some clues and answers for the crossword puzzle:

#### Across:
1. ATP: The energy used in active transport.
2. Diffusion: The movement of particles through a cell membrane without using energy.
3. Concentration Gradient: The solution has a higher concentration of solutes.
4. Endocytosis: A type of endocytosis in which cells take in liquid, known as cell drinking.
5. Exocytosis: A type of transport in which cells take in solids, known as cell eating.
6. Osmosis: The movement of particles out of the cell through membrane-bound vesicles.
7. Homeostasis: The ability to maintain a stable internal condition.
8. Isotonic Solution: A solution of equal concentration to a cell.

#### Down:
1. Diffusion: The movement of particles through a cell membrane without using energy.
2. Osmosis: The name of the diffusion with the help of water.
3. Concentration Gradient: The movement of molecules from an area with a higher concentration to an area with a lower concentration.
4. Endocytosis: A type of endocytosis in which cells take in liquid, known as cell drinking.
5. Exocytosis: A type of transport in which cells take in solids, known as cell eating.
6. Homeostasis: The ability to maintain a stable internal condition.
7. Isotonic Solution: A solution of equal concentration to a cell.

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Final Answers:

1. T, T, F, T, F
2. Left: Facilitated Diffusion; Middle: Active Transport; Right: Passive Transport
3. c) Endocytosis
4. a) Glucose
5. d) All the movement of particles across the cell membrane requires energy.
6. b) Diffusion
7. a) Facilitated Diffusion
8. d) Osmosis
9. c) In active transport, particles move from higher concentration to lower concentration.
10. c) Homeostasis
11. a) Diffusion
12. c) increases

Crossword Puzzle: Solve based on the provided clues and answers.