Understanding Osmosis for Grade 7

What is the process of water diffusion called?

• Filtration

• Condensation

• Evaporation

• Osmosis

Define osmotic pressure.

• Osmotic pressure is the amount of energy required to dissolve a solute in a solvent.

• Osmotic pressure is the temperature at which a solution boils.

• Osmotic pressure is the force exerted by solute particles in a vacuum.

• Osmotic pressure is the pressure needed to stop the flow of solvent into a solution through a semipermeable membrane.

How does osmosis occur in cells?

• Osmosis is the process of active transport of nutrients into the cell.

• Osmosis is the movement of solutes from high to low concentration.

• Osmosis occurs only in plant cells and not in animal cells.

• Osmosis is the movement of water through a semipermeable membrane from low to high solute concentration.

What happens to a cell in a hypertonic solution?

• The cell shrinks due to water loss.

• The cell swells due to excess water.

• The cell remains unchanged in size.

• The cell bursts from too much water.

What is the effect of osmosis on plant cells?

• Osmosis only affects animal cells, not plant cells.

• Osmosis causes plant cells to become turgid in hypotonic solutions and can lead to plasmolysis in hypertonic solutions.

• Osmosis has no effect on plant cells in any solution.

• Osmosis causes plant cells to shrink in hypotonic solutions.

Describe a simple experiment to demonstrate osmosis.

• Place one potato half in saltwater and the other in plain water to observe osmosis.

• Boil a potato and measure its weight before and after.

• Soak a piece of bread in vinegar and observe changes.

• Place two potato halves in sugar water and compare them.

What is the role of the cell membrane in osmosis?

• The cell membrane regulates the movement of water during osmosis.

• The cell membrane prevents water from entering the cell during osmosis.

• The cell membrane has no effect on the process of osmosis.

• The cell membrane allows all substances to pass freely during osmosis.

How does osmosis differ from diffusion?

• Osmosis is the diffusion of water across a selectively permeable membrane, while diffusion is the movement of any particles from high to low concentration.

• Osmosis and diffusion are the same process with different names.

• Osmosis is the movement of particles across any membrane.

• Diffusion only occurs in gases, while osmosis occurs in liquids.

What occurs to a cell in a hypotonic solution?

• The cell absorbs nutrients more efficiently.

• The cell remains unchanged in size.

• The cell shrinks and becomes dehydrated.

• The cell swells and may burst.

Why is osmosis important for living organisms?

• Osmosis is the process of cell division in organisms.

• Osmosis is important for maintaining cell turgor, nutrient absorption, and waste removal in living organisms.

• Osmosis helps in the production of energy in mitochondria.

• Osmosis is primarily responsible for photosynthesis.