Paramecium caudatum lives in a hypotonic solution. Excess water is removed from

Question

Paramecium caudatum lives in a hypotonic solution. Excess water is removed from the cell via structures called contractile vacuoles. Given what you know about vacuoles (refer to Table 3.3, p. 68) and what you know about cells able to contract, suggest the type of transport that occurs when water is moved out of Paramecium. Describe and draw what happens to a potato cube when placed in a hypotonic solution, a hypertonic solution, and an isotonic solution. Hypotonic solution Hypertonic solution Isotonic solution

Explanation / Answer

(10)Paramoecium have two contractile vacuoles on either ends which help in osmoregulation since these organisms live in freshwater (hypotonic). Water enters the cell by diffusion; whereas the excess water that is collected is expelled out of the body by these two contractile vacuoles through osmosis.

(10)

Hypotonic solution-Potato cube would swell as water enters the potato cells

Hypertonic solution-Potato cube would shrink as water leaves the potato cells

Isotonic solution-Potato cubes remain as it is

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