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CBSE Video lectures for download

     

=Define a cell. Who discovered cell?

=Who discovered first living cell?

=How does the cell of a onion peel look like?

=Who discovered nucleus in the cell?

=Who coined the term ‘protoplasm’ for the fluid substance of the cell?

=Cell theory

=Who gave the cell theory

=unicellular organisms

=cell organelles

=What is plasma membrane?

=Define osmosis.

=What is diffusion?

=What is a hypotonic solution?

=What is a isotonic solution?

=What is a hypertonic solution?

=What is a cell wall?

=What is nucleus?

=What is cytoplasm?

=Endoplasmic Reticulum

=What is Golgi apparatus

=What are Lysosomes?

=What are mitochondria?

=What are Plastids?

=What are Vacuoles?

=labelled diagram of a animal cell

=Labelled diagram of a plant cell

 

What are Vacuoles?

What are Vacuoles?

Vacuoles are storage sacs for solid or liquid contents. Vacuoles are small sized in animal cells while in plant cells they are very large. The central vacuole of some plant cells may occupy 50-90% of the cell volume. In plant cells vacuoles are full of cell sap and provide turgidity and rigidity to the cell.
Many substances of importance in the life of the plant cell are stored in vacuoles. These include amino acids, sugars, various organic acids and some proteins.



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What are Vacuoles?

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