Name two cell-organelles that are double membrane bound. What are the characteristics of these two organelles? State their functions and draw labelled diagrams of both?

Haritha,Subject Matter Expert at Edumarz

Solution:Mitochondria and chloroplasts are double membrane bound organelles found in a cell.

Structure of chloroplast

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Structure of mitochondria

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Mitochondria

• It is a double-membrane structure, having both inner and outer membranes

• Lumen in mitochondria is divided into two aqueous compartments termed as inner and outer compartments

• The matrix is a dense,homogeneous substance that fills the inner compartment of the mitochondria.

• The number of infoldings formed by the inner membrane of mitochondria is called cristae

• Mitochondria produce cellular energy in the form of ATP and are therefore called “power houses” of the cell.

Chloroplast

• Chloroplast is a double membrane bound structure

• Chloroplast contains pigment called chlorophyll

• The inner membrane of chloroplast is less permeable when compared to the outer membrane

• Stroma is the space limited by inner membrane of chloroplast

• The number of organised flattened membranous sacs present in the stroma is termed the thylakoids