CBSE Class 9 Answered

Endocytosis is the process of uptake of materials from outside the cell by the invagination of the plasma membrane. Macromolecules and particulate substances are engulfed by localised regions of the plasma membrane that surround the substance and pinch off to form an intracellular vesicle. 2 kinds of endocytosis are phagocytosis and pinocytosis. The substances taken in through endocytosis varies according to the organisms.

When a living plant cell loses water through osmosis, the contents of the cell shrink away from the cell wall. This process is called plasmolysis. Plasmolysis does not occur in dead cells. Plasmolysis is seen when plant cells loses water to a hypertonic environment.