17 Questions
What is the term used to describe the movement of oxygen from the alveoli in the lungs into the red blood cells?
Gas exchange
Which of the following factors affects the rate of diffusion?
All of the above
What is the term used to describe the movement of carbon dioxide from the red blood cells into the lungs?
Gas exchange
How does an increase in temperature affect the rate of diffusion?
Increases the rate of diffusion
What is the term used to describe the movement of urea from the liver cells into the blood plasma?
Active transport
How does an increase in the concentration gradient affect the rate of diffusion?
Increases the rate of diffusion
What happens to a cell if the external solution is more concentrated in terms of water potential?
It becomes shrivelled
What pressure is essential in keeping the leaves and stems of plants rigid?
Turgor pressure
What happens if the external solution is more dilute in terms of osmosis in plants?
Water moves into the cell causing swelling
What results in the cell membrane moving away from the cell wall and eventual cell death?
Plasmolysis
In the experiment with sugar solutions and plant tissue, what affects the mass of the potato tubers?
Concentration of sugar solution
What defines active transport in terms of particle movement?
Movement against the concentration gradient
What is the main difference between active transport and diffusion?
Active transport requires energy from respiration, while diffusion does not.
In root hairs, why does the uptake of water and mineral ions require energy from respiration?
There are higher concentrations of mineral ions in the cells than in the soil.
Why may diffusion not take place between the gut and the bloodstream for some substances?
The bloodstream has lower sugar molecule concentration than the gut.
What role does active transport play in moving sugar from the gut into the bloodstream?
Active transport helps move sugar against its concentration gradient.
In which scenario is active transport essential: when moving mineral ions in root hairs or when transporting glucose from the gut to the blood?
Transporting glucose from the gut to the blood
Explore the concept of active transport in biology through examples like water and mineral ion uptake in root hairs and nutrient absorption in the gut. Understand why active transport requires energy from respiration.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
