Podcast
Questions and Answers
In which of the following scenarios does diffusion play a significant role?
In which of the following scenarios does diffusion play a significant role?
- Uptake of water in root hairs
- Oxygen and carbon dioxide exchange in the lungs (correct)
- Active transport of mineral ions in root hairs
- Absorption of glucose and amino acids in the gut
Why does active transport occur in root hairs for mineral ions uptake?
Why does active transport occur in root hairs for mineral ions uptake?
- To facilitate movement through a semipermeable membrane
- Due to the higher concentration of mineral ions in the cells (correct)
- To maximize efficiency by utilizing energy from respiration
- To create equilibrium in ion concentration
How does the adaptation of a high surface area to volume ratio benefit single-celled organisms?
How does the adaptation of a high surface area to volume ratio benefit single-celled organisms?
- It reduces the need for respiration
- It enhances the efficiency of diffusion (correct)
- It promotes osmosis over diffusion
- It increases the rate of active transport
What is a key function of active transport in the gut for absorbing substances like glucose and amino acids?
What is a key function of active transport in the gut for absorbing substances like glucose and amino acids?
Why is active transport necessary for moving sugar molecules from the gut into the bloodstream?
Why is active transport necessary for moving sugar molecules from the gut into the bloodstream?
Why can single-celled organisms rely on diffusion for transporting molecules?
Why can single-celled organisms rely on diffusion for transporting molecules?
Why can't multicellular organisms rely on diffusion alone for transporting molecules?
Why can't multicellular organisms rely on diffusion alone for transporting molecules?
In the lungs, where does the transfer of oxygen and carbon dioxide primarily occur?
In the lungs, where does the transfer of oxygen and carbon dioxide primarily occur?
What is the role of villi in the small intestine?
What is the role of villi in the small intestine?
Why do single-celled organisms have low metabolic demands?
Why do single-celled organisms have low metabolic demands?
Why do multicellular organisms need adaptations for molecule transport?
Why do multicellular organisms need adaptations for molecule transport?
What is the main function of lamellae in fish gills and leaves?
What is the main function of lamellae in fish gills and leaves?
How do alveoli and capillary walls in the lungs facilitate gas exchange?
How do alveoli and capillary walls in the lungs facilitate gas exchange?
What is the purpose of the single layer of surface cells in the villi of the small intestine?
What is the purpose of the single layer of surface cells in the villi of the small intestine?
Why is having a short diffusion pathway important for the efficiency of processes like nutrient absorption?
Why is having a short diffusion pathway important for the efficiency of processes like nutrient absorption?
How does the constant exchange of oxygen and carbon dioxide in the lungs help maintain a steep concentration gradient?
How does the constant exchange of oxygen and carbon dioxide in the lungs help maintain a steep concentration gradient?
In which direction does water flow in fish gills and how does this maintain a steep concentration gradient?
In which direction does water flow in fish gills and how does this maintain a steep concentration gradient?
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