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_____________ is an energy-consuming process by which substances are transported against their concentration gradient.
Active transport
What is plasmolysis?
Shrinking/pulling/tearing away of a plant cell's membrane from its cell wall.
Which part of a plant cell is fully permeable?
cell wall
What is meant by a turgid cell?
tight and firm, bigger or swollen
True or False: Plant cells do not burst in pure water while animal cells burst in pure water.
True
What is meant by a partially permeable membrane?
It lets some molecules to pass through but not others.
Which is larger- a water molecule or sugar molecule?
sugar molecule
List three examples of diffusion in living organisms.
roots absorbing water, gas exchange, absorption of nutrients
What effect does an increase in temperature have on the kinetic energy of molecules of a gas or a solute?
The molecules move faster.
How would you describe a solution that has a high concentration of water molecules?
dilute solution, there is a lot of water, high water potential
How do cells become flaccid?
The environment has a higher concentration of solutes. The solution is very concentrated.
How can plasmolysis be brought about?
If the plant cell is placed in a concentrated solution.
True or False: Animal cells plasmolysed in a concentrated sugar solution.
False. Only plant cells can plasmolysed.
True or False: Diffusion happens faster when the temperature rises.
True
True or False: Water moves out of the cell by osmosis, through the partially permeable cell wall.
False. Partially permeable membrane not cell wall.
True or False: Plants cells do not burst in pure water because the cell wall stop water from getting into the cell.
False. The cell wall allows water to enter the cell but it's strong to prevent the cell from bursting.
