Answer:
(b) Endocytosis is the ingestion of material by the
cells through their plasma membrane. It is a collective term that describes
three similar processes phagocytosis (cell eating), potocytosis (cell drinking)
and receptor-mediated endocytosis.
These processes are pathways to specifically internalize solid
particles, small molecules and ion, and macromolecules, respectively. All of
them require energy, so they may be regarded as different forms of active
transport.
Out of these phagocytosis is the common method of feeding
among the Protozoa (e.g., Amoeba) and lower Metazoa (e.g., sponges). In
pseudopodial movement the phagocyte enguls the particle lysosomes, join with
the vacoule containing ingested particle and pour their contents into the
vacoule to destroy the particle.
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