Question

What is vacuole ?? define it..

Answer 1

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Answer:

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✔Vacuoles are liquid or solid filled in a membrane. In plant cells vacuoles are large and permanent.

✔They cover up almost 90% of the cell space in mature plant cells. Due to the big size of the vacuole, other organelles including nucleus move towards the periphery.

♦ Functions of the nucleus ♦

=> They keep the cells turgid and provide them rigidity and support.

=> They store food material and waste products.

=> Contractile vacuoles help in maintaining the water balance and in excretion.

=> Sap vacuoles maintain osmotic concentration in plant cells needed for water absorption.

=> Food vacuoles in protozoans help in digestion of food.

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Answer 2

Vacoules are fluid filled membrane bound clear spaces in the cytoplasm.

They are filled with water and a variety of substances like minerals, sugars , carbohydrates, organic acids , pigments and metabolic wastes in solution .

The membrane of the vacoule is called tonoplast and the liquid they contain is cell sap .

In mature plant cells , a large vacuole occupies most of the central part of cell .

This pushes the nucleus and other cell organelles to the periphery of the cell . These vacoules are called sap vacoules .

In animal cells , the vacoules are generally absent . But if they are present then , they are much smaller.

Food vacoules and contractile vacoules occur in unicellular animals such as Amoeba and paramecium .

Functions of vacoules :

• They keep the cells turgid and provide rigidity and support.

• They store food material and waste products .

• They help in maintaining the water balance and in extraction .