SB1I Transporting Substances

Question 1

Describe how substances are transported by active

transport (including the need for energy).

Answer 1

Active transport is against the concentration gradient. It is movement of molecules from a region of lower concentration to a region of higher concentration using energy released during respiration

Question 2

Explain how substances are transported by diffusion.

Answer 2

Diffusion goes with the concentration gradient, from a high concentration to a low concentration.

Question 3

Explain how substances are transported by osmosis.

Answer 3

Osmosis is water molecules moving from a high to a lower concentration across a partially permeable membane and down a concentration gradient

Question 4

Explain the effects of osmosis on cells

Answer 4

Hypertonic, means water getting out of the cell, shrinking the cell
Isotonic means water coming inside, and water getting outside the cell;
Hypertonic means water getting inside the cell, leaving cells to burst.

Question 5

Explain the effects of osmosis on plant tissues.

Answer 5

Plasmolyzed is when water is getting out, shrinking the vacuole.
Flaccid means water coming in and out, in equal amounts.]
Turgid is when water is getting in. Increases the vacuole size, becomes fat, does not burst, due to cell wall.

Question 6

Calculate percentage gain and loss of mass in

osmosis.

Answer 6

final mass-intial mass/intial mass x 100