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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 is Endoplasmic Reticulum? Write its types.

What is Endoplasmic Reticulum? Write its types.

The endoplasmic reticulum (ER) is a large network of membrane-bound tubes and sheets. It looks like long tubules or round. There are two types of ER– rough endoplasmic reticulum (RER) and smooth endoplasmic reticulum (SER). RER looks rough under a microscope because it has particles called
ribosomes attached to its surface. The ribosomes, which are present in all active cells, are the sites of protein manufacture. The manufactured proteins are then sent to various places in the cell depending on need, using the ER. The SER helps in the manufacture of fat molecules, or lipids, important for cell function.

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What is Endoplasmic Reticulum? Write its types.

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