UCT - Osmosis and Tonicity

During osmosis

• water moves from high to low concentration

• large or oddly shaped molecules move across a cell membrane

• water moves when energy is used

• proteins are built

Answer explanation

During osmosis, water moves from an area of high concentration to an area of low concentration. This process does not require energy and specifically involves the movement of water, not large molecules or protein synthesis.

Permeable means

• things can pass through

• the concentration levels are different

• it is permanent

• things are stuck

Answer explanation

Permeable refers to materials that allow substances to pass through them. Therefore, the correct choice is 'things can pass through', as it accurately describes the nature of permeable materials.

The cell below is in a _________ solution.

• Hypotonic

• Hypertonic

• Isotonic

Answer explanation

The cell is in a hypertonic solution because it has a higher concentration of solutes outside than inside. This causes water to move out of the cell, leading to cell shrinkage.

Tags

NGSS.MS-LS1-2

The cell below is in a _____________ solution.

• Hypertonic

• Hypotonic

• Isotonic

Answer explanation

The cell is in a hypotonic solution, meaning the concentration of solutes outside the cell is lower than inside. This causes water to flow into the cell, potentially leading to swelling or bursting.

Tags

NGSS.MS-LS1-2

What term is used to describe when two solutions have reached a balanced state?

• Hypotonic

• Tonicity

• Hypertonic

• Equilibrium

Answer explanation

The term 'Equilibrium' describes a balanced state between two solutions, where the concentrations of solutes are equal, resulting in no net movement of water. This is distinct from terms like hypotonic or hypertonic, which describe relative concentrations.

How are osmosis and diffusion similar processes?

• A both move solute molecules

• both move water molecules

• they move low to high concentrations

• both move high to low concentrations

Answer explanation

Osmosis and diffusion are similar as both processes move substances from areas of high concentration to areas of low concentration. This principle helps maintain balance in cells and across membranes.

Tags

NGSS.MS-LS2-3

A cell has 80% water 20% solute, the surrounding solution has 60% water and 40% solute. What type of solution is this?

• Hypertonic

• Isotonic

• Hypotonic

• Equilibrium

Answer explanation

The cell has a higher water concentration (80%) compared to the surrounding solution (60%). This means the surrounding solution is hypertonic, causing water to move out of the cell, leading to potential cell shrinkage.

During osmosis

• water moves from high to low concentration

• large or oddly shaped molecules move across a cell membrane

• water moves when energy is used

• proteins are built

Answer explanation

During osmosis, water moves from an area of high concentration to an area of low concentration. This process occurs naturally to balance concentrations on either side of a membrane, making the first answer choice correct.

Tags

NGSS.MS-LS2-1

What type of solution allows water to enter the plant cell?

• hypotonic solution

• hypertonic solution

• isotonic solution

• active transport

Answer explanation

A hypotonic solution has a lower concentration of solutes compared to the inside of the plant cell, causing water to enter the cell by osmosis, leading to turgor pressure that helps maintain the cell's structure.

Tags

NGSS.MS-LS1-2

Identify the cell that will take in water and burst.

Tags

NGSS.MS-LS1-2