Question

question 11
what happens to a plant cell placed in a hypotonic solution?
o it swells but the cell wall keeps it from bursting
the cell membrane pulls away from the cell wall
o it swells and bursts
o it shrinks due to water loss
question 12
the movement of any substance from a region of higher concentration to a region of
lower concentration is generally referred to as:
diffusion
exocytosis
active transport
pinocytosis

Explanation:

• Question 11: In a hypotonic solution (where the solute concentration outside the cell is lower than inside), water moves into the plant cell by osmosis. Plant cells have a rigid cell wall. As water enters, the cell swells (the central vacuole expands), but the cell - wall exerts turgor pressure and prevents the cell from bursting. When the cell membrane pulls away from the cell wall (plasmolysis), it occurs in a hypertonic solution (water moves out). Animal cells (without a cell wall) would burst in a hypotonic solution, but plant cells do not. Shrinking due to water loss is also for hypertonic conditions.
• Question 12: Diffusion is the movement of any substance (not just water - which is osmosis) from a region of higher concentration to a region of lower concentration. Exocytosis is the process of vesicles fusing with the plasma membrane to release their contents outside the cell. Active transport moves substances against their concentration gradient (from low to high) and requires energy. Pinocytosis is a type of endocytosis where the cell takes in extracellular fluid in the form of small vesicles.

Answer:

• Question 11: it swells but the cell wall keeps it from bursting
• Question 12: diffusion