Questions and Answers
What is the role of active transport in plants?
How does glucose absorption occur in the intestines when glucose concentration is lower outside the cells?
Which process requires energy for the movement of substances?
What is the main difference between diffusion and active transport?
Signup and view all the answers
Which substances typically move by diffusion?
Signup and view all the answers
What energy source is used for active transport in animals?
Signup and view all the answers
What distinguishes osmosis from active transport?
Signup and view all the answers
In which scenario is active transport NOT needed for glucose absorption?
Signup and view all the answers
Which of the following correctly describes the procedure for setting up the experiment with potato chips?
Signup and view all the answers
What is the purpose of weighing the potato chips before and after immersion in sugar solutions?
Signup and view all the answers
After conducting the experiment, what is inferred if the potato chips gained weight in sucrose solutions?
Signup and view all the answers
If potato chips are placed in a solution with lower concentration than their internal cellular environment, what would most likely happen?
Signup and view all the answers
How is the percentage weight change calculated from the experiment?
Signup and view all the answers
Which of the following statements best explains osmosis in the context of the experiment?
Signup and view all the answers
What role does concentration gradient play in this experiment?
Signup and view all the answers
What conclusion can be drawn from the graph plotting percentage weight change against sucrose concentration?
Signup and view all the answers
What primarily drives the movement of glucose through the dialysis tube in the experiment?
Signup and view all the answers
Why is starch unable to pass through the dialysis tubing used in the experiment?
Signup and view all the answers
What is the best definition of semi-permeable as illustrated in this experiment?
Signup and view all the answers
In what way does this experiment model the absorption in the small intestine?
Signup and view all the answers
Which solution is used to test for the presence of glucose in the water around the dialysis tube?
Signup and view all the answers
What best distinguishes diffusion from osmosis in the context of this experiment?
Signup and view all the answers
Which of the following describes the main result expected after testing the water surrounding the dialysis tube for glucose?
Signup and view all the answers
What essential factor must be maintained in the experiment for diffusion to occur effectively?
Signup and view all the answers
Study Notes
Active Transport in Plants and Animals
- Active transport allows plants to absorb necessary ions from the soil against concentration gradients.
- In animals, glucose is absorbed through the gut wall into the bloodstream, even when glucose concentration is lower in the intestine compared to intestinal cells.
- Active transport of glucose requires energy from respiration, particularly after low glucose conditions.
Comparison of Transport Mechanisms
-
Diffusion: Movement of particles from high to low concentration without energy.
- Substances involved: carbon dioxide, oxygen, water, nutrients.
- Osmosis: A specialized form of diffusion for water across a selectively permeable membrane, no energy required.
- Active Transport: Movement of substances against a concentration gradient, requires energy.
Experiment: Diffusion of Starch and Glucose
- Aim: Observe diffusion of starch and glucose through a semi-permeable membrane.
- Equipment used: dialysis tube, beaker of warm water, glucose/starch solution, iodine solution for starch, Benedict’s solution for glucose test.
- Method involves filling a dialysis tube with a solution, immersing it in warm water, and testing for glucose and starch after a set time.
Experiment Results and Analysis
- Glucose test can demonstrate if glucose diffused through the dialysis tube by changing color with Benedict’s solution.
- Starch, being a larger molecule, cannot pass through the dialysis tubing, illustrating semi-permeability.
- Semi-permeable membranes allow certain substances to pass while blocking others.
Understanding of Osmosis through Additional Experiment
- Potato chips placed in sugar solutions of varying molarity analyze osmosis effects.
- Changes in weight of potato chips are recorded to assess water movement through osmosis.
- Percentage weight change calculated gives insights into water concentration inside potato cells.
Conclusion
- Observing diffusion and osmosis through experiments helps understand nutrient absorption in organisms.
- Semi-permeable membranes play a crucial role in regulating which substances enter or leave cells.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
This quiz covers the process of active transport in both plants and animals. It highlights how plants absorb ions from the soil and how animals move glucose across the gut wall into the bloodstream. Test your understanding of these essential biological mechanisms.