7. why is endocytosis found in animals only?

ANSWER:-

Endocytosis is the taking in or engulfing of matter by living cell . Cell wall is absent in animal cells, so endocytosis is possible due to the flexibility of plasma membrane.

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What is Cytology
CYTOLOGY: Study of structure and composition of cell is called as 'cytology'. All living organisms are composed of microscopic units called as cell. Cell was first observed by Robert Hooke in a dead cork slice in the year 1665. First living cell was discovered by A.V. Leeuwenhoek. Components of Cell:- Cell wall (in plants) Cell membrane/Plasma membrane ( Both plants and animals) Nucleus Cytoplasm Cell organelles read more

Text Solution

Solution : Endocytosis refers to invagination of a small region of plasma membrane, forming an interacellular membrane-bound vesicle. It has been observed in many kinds of animal cells, where the plasma membrane is in direct contact with external medium. Endocytosis is not shown by plant cells because a rigid cell wall is present over the plasma membrane in them. Thus, this process is found in animals only.

Answer

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Answer

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So, the correct answer is, ’Cell walls are absent in animal cells’.

Note: -Endocytosis may be a cellular process through which substances are brought into the cell.

-The material to be internalized is surrounded by a neighborhood of the cell wall, which then buds off inside the cell to make a vesicle containing the ingested material. -Endocytosis includes pinocytosis and phagocytosis. The three primary sorts of endocytosis are phagocytosis, pinocytosis, and receptor-mediated Endocytosis.-Pinocytosis is the ingestion of liquid into a cell by the budding of small vesicles from the cell membrane.

Endocytosis is the engulfment of food and other substances from an external medium by a plasma membrane. Endocytosis is only seen in animal cells but not in plant cells because in plant cells cell wall is present which is very tough and rigid. Animal cells lack a cell wall outside the plasma membrane.

Endocytosis and exocytosis are visible in animal cells and protists like protozoa.
In these organisms, bulk transport across the plasma membrane refers to the transport of large quantities of micro molecules and macromolecules and food particles.
it is accompanied by the formation of transport or carrier vesicles.
The latter are endocytotic and perform bulk transport inwardly.
The phenomenon is called endocytosis.
Endocytosis is of two types. They are pinocytosis and phagocytosis.
Exocytic vesicles perform bulk transport outwardly. It is called exocytosis. Exocytosis performs secretion and excretion.

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