Water movement into and out of cells is of prime importance to all living things. A single-celled organism has star-shaped organelles called contractile vacuoles to move
water from inside to outside the cell. The data presented in the table below were
obtained in an experiment in which the organism was placed in water with different
salt concentrations,
High

The rate at which the contractile vacuole contracted to pump out excess water was
recorded. How could you explain the observed relationship between the rate of
contractile vacuole concentration and the salt concentration?
E. When the salt concentration outside the cell is very high, diffusion causes water
to move inside the cell, and the contractile vacuole has to contract more rapidly.
G. When the salt concentration outside the cell is very low, diffusion causes water to
move outside the cell, and the contractile Vacuole has to contract more rapidly
H. When the salt concentration outside the cell is very high, diffusion causes water to
move outside the cell, and the contractile vacuole does not need to contract as
rapidly
1. When the salt concentration outside the cell is very low, diffusion causes water to
move outside the cell, and the contractile vacuole does not need to contract as
rapid