Which structure in plant and animal cells contains various enzymes?

Given below are some characters of a cell organelle. Identify the correct organelle which shows all the characters described above.
$(i)$ It is a membrane bound space found in the cytoplasm.
$(ii)$ It is bound by a single membrane called tonoplast.
$(iii)$ It contains water,sap,excretory products and other materials not useful to the cell.
$(iv)$ It has higher concentration of sap than the cytoplasm.

What are gas vacuoles? State their functions.

The pigment anthocyanin is located in:

In protozoans like $Amoeba$ and $Paramecium$,the organelle responsible for osmoregulation is:

Both lysosomes and vacuoles are endomembrane structures,yet they differ in terms of their functions. Comment.