Osmosis and Solutions in Biology

The video covers water potential, osmosis, and the movement of water across semi-permeable membranes. It explains the concepts of isotonic, hypotonic, and hypertonic solutions and how cells control osmosis through aquaporins. The video also discusses determining osmolarity in plant cells and the responses of plant and animal cells to different solution types, highlighting the importance of maintaining isotonic conditions for animal cells.

What property of water allows it to dissolve ionic compounds like salt?

• Its viscosity

• Its density

• Its polarity

• Its high temperature

In osmosis, water moves across a semi-permeable membrane towards areas with:

• Lower solute concentration

• No solute concentration

• Higher solute concentration

• Equal solute concentration

What term describes a solution with the same concentration as the cell it surrounds?

• Isotonic

• Hypertonic

• Hypotonic

• Atonic

How do aquaporins affect the rate of osmosis in cells?

• They slow down osmosis

• They prevent osmosis

• They have no effect on osmosis

• They speed up osmosis

What is the term for the total solute concentration in a cell?

• Concentration gradient

• Osmolarity

• Solubility

• Molarity

If a plant tissue gains mass in a solution, the solution is likely:

• Atonic

• Isotonic

• Hypotonic

• Hypertonic

What happens to animal cells in a hypotonic solution?

• They shrink

• They burst

• They remain unchanged

• They become rigid

Why do plant cells not burst in a hypotonic solution?

• They are impermeable to water

• They have no solutes

• They have a rigid cell wall

• They have a flexible membrane

What is the effect of a hypertonic solution on plant cells?

• They burst

• They undergo plasmolysis

• They remain unchanged

• They become turgid

Why is saline solution used in IVs for rehydration?

• It is hypertonic to human cells

• It is hypotonic to human cells

• It is isotonic to human cells

• It is atonic to human cells