Movement Of Substances Into And Out Of Cells
Overview
Cells are not sealed boxes. They constantly exchange substances with their surroundings, taking in what they need and removing what they do not. Three transport mechanisms make this possible: diffusion, osmosis and active transport.
In this lesson you will learn how each process works, what factors speed them up or slow them down, and how to investigate diffusion and osmosis in the lab. These concepts underpin gas exchange, nutrient absorption and water balance across the whole course.
Objectives
- Understand the processes of diffusion, osmosis and active transport by which substances move into and out of cells
- Understand how factors affect the rate of movement of substances into and out of cells, including the effects of surface area to volume ratio, distance, temperature and concentration gradient
- Investigate diffusion and osmosis using living and non-living systems
Lesson Note
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Lesson Evaluation
Congratulations on completing the lesson on Movement Of Substances Into And Out Of Cells. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- Which process moves water molecules through a partially permeable membrane? A) Diffusion B) Active transport C) Osmosis D) Evaporation Answer: C
- What happens to an animal cell placed in pure water? A) It becomes turgid B) It becomes plasmolysed C) It may burst (lysis) D) Nothing happens Answer: C
- Active transport requires energy from which process? A) Photosynthesis B) Osmosis C) Diffusion D) Respiration Answer: D
- Which factor does NOT directly affect the rate of diffusion? A) Temperature B) Concentration gradient C) Colour of the solution D) Surface area Answer: C
- A plant cell placed in a concentrated salt solution will become: A) Turgid B) Plasmolysed C) Lysed D) Unchanged Answer: B
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Practice Mock Questions
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