<Li> Contractile vacuoles are found in certain protists, especially those in Phylum Ciliophora . These vacuoles take water from the cytoplasm and excrete it from the cell to avoid bursting due to osmotic pressure . </Li> <Ul> <Li> Lysosomes are involved in cellular digestion . Food can be taken from outside the cell into food vacuoles by a process called endocytosis . These food vacuoles fuse with lysosomes which break down the components so that they can be used in the cell . This form of cellular eating is called phagocytosis . </Li> <Li> Lysosomes are also used to destroy defective or damaged organelles in a process called autophagy . They fuse with the membrane of the damaged organelle, digesting it . </Li> </Ul> <Li> Lysosomes are involved in cellular digestion . Food can be taken from outside the cell into food vacuoles by a process called endocytosis . These food vacuoles fuse with lysosomes which break down the components so that they can be used in the cell . This form of cellular eating is called phagocytosis . </Li> <Li> Lysosomes are also used to destroy defective or damaged organelles in a process called autophagy . They fuse with the membrane of the damaged organelle, digesting it . </Li>

The main function of cell organelles is secretion