1.) D
2.) A,B
3.) 1) A saturated salt solution is definitely hyper tonic.
2) Depending on the cell and the salt, there will be an isotonic concentration, where everything is balanced.
4) 1) Water tends to enter the Paramecium.
This is a process of passive transport.
This is a case of osmosis. In osmosis the SOLVENT travels from a region of low solute density to region of high solute density.
2) Paramecium have what is called a contractile vacuole which contracts forcing water out to keep a stable osmotic pressure in the cell. Considering the vacuole would need to use energy is would be active either way
