Osmosis

Why do plants often die when exposed to high concentrations of salt in their environment?

• The salt directly poisons the plant cells.

• The salt lowers the freezing point of water, causing the plant to freeze.

• Water moves out of the plant cells into the saltier environment.

• The salt blocks the plant's ability to absorb sunlight.

In osmosis, how do water molecules move across a semi-permeable membrane?

• From an area of low water concentration to an area of high water concentration.

• From an area of high solute concentration to an area of low solute concentration.

• From an area of high water concentration to an area of low water concentration.

• Only through aquaporins, requiring energy.

In the U-tube experiment, if salt is added to Side B, which side is considered hypertonic, and in which direction will water initially move?

• Side A is hypertonic; water moves from Side B to Side A.

• Side B is hypertonic; water moves from Side A to Side B.

• Both sides are isotonic; there is no net water movement.

• Side A is hypotonic; water moves from Side B to Side A.

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What happens to red blood cells when placed in a hypotonic solution?

• They shrink.

• They swell and may burst.

• They remain stable.

• They become hypertonic.

How do plant root hair cells absorb water from the surrounding soil?

• The soil has a higher solute concentration than the root hair cells, causing water to move out of the roots.

• The root hair cells have a higher solute concentration than the soil, causing water to move into the roots.

• Water is actively pumped into the root hair cells by specialized proteins.

• The root hair cells and the soil have equal solute concentrations, leading to no net water movement.