rift valley. 1  A long, narrow valley lying between two normal geologic faults. Rift valleys usually form where the Earth's lithosphere has become thin through extension associated with plate-tectonic processes. 2  The deep undersea valley located along the center of the mid-ocean ridge.
Vacuoles and lysosomes have similar functions. Vacuoles in plant cells are in some respects the equivalent of lysosomes in animal cells. The environment inside a vacuole is slightly acid (pH about 5.0) whilst for the rest of the cytosol it is slightly alkaline (about pH 7.2).acuoles and lysosomes have similar functions. Vacuoles in plant cells are in some respects the equivalent of lysosomes in animal cells. The environment inside a vacuole is slightly acid (pH about 5.0) whilst for the rest of the cytosol it is slightly alkaline (about pH 7.2).
Vacuole Function. The Vacuole is a cell organelle that is present only in plant cells. The main vacuole Function is in maintaining the structure and shape of the cell. Cells of plants do not increase in size by expanding their cytoplasm but by increasing the size of their vacuoles.acuole Function. The Vacuole is a cell organelle that is present only in plant cells. The main vacuole Function is in maintaining the structure and shape of the cell. Cells of plants do not increase in size by expanding their cytoplasm but by increasing the size of their vacuoles.