ICSE Class 7 Answered

Cell organelles

Location

Function

Nucleus

• Centre of the cytoplasm

• Regulates cell functions
• Contains chromosomes, made of genes, which control hereditary characteristics

Mitochondria

• Spherical, rod-shaped dispersed in the cytoplasm

• Produces ATP which acts as energy currency for the cell

Endoplasmic reticulum

• Irregular network of tubular double membrane distributed over the entire cell cytoplasm

• Folding of proteins
• Transport of synthesised proteins

Golgi apparatus

• Stacks of flattened membrane sacs located near the nucleus

• Modification and export of proteins

Vacuoles

• Fluid-filled or solid-filled and membrane-bounded spaces in the cell cytoplasm

• Store water and other substances, food, pigments and waste products
• Provides turgidity to the cells

Lysosomes

• Simple, tiny, single membrane bound sacs dispersed in cell cytoplasm

• Digest and remove wastes from the cell

Ribosomes

• Dense, spherical, small granules, either scattered in the cytoplasm or attached to the outside of endoplasmic reticulum

• Synthesise proteins

Plastids (only in plant cells)

• Oval, spherical and disc-shaped dispersed in cell cytoplasm

• Site for manufacture and storage of important chemical compounds used by the cell