cell
TRANSCRIPT
Cell : function and description
Cell wall Description
Outer layer.Rigid and strong.Made up of
cellulose.
FunctionsSupport (grow tall)Protection from
harsh environment.Allows H2O,CO2,O2 in
and out of cell through diffusion.
Cell membraneDescription function
Plant-inside cell wallAnimal-outer layer;
cholesterolSelectively permeable.
Support ProtectionControls movement of
materials in /out of cellBarrier between cell and
its environment
NucleusDESCRIPTION FUNCTIONLarge, ovalMay contain one or more
nucleoliHolds DNA
Controls cell activitiesContains the hereditary
material of the cell
Nuclear membraneDescription Functions
Surrounds nucleusDouble membraneSelectively permeable
Controls movement of materials in/out of nucleus
CytoplasmDescription Functions
Clear, thick, jellylike material (cytosol)
Organelles found inside cell membrane
Contains the cytoskeleton fibers
Supports and protects cell organelles
Endoplasmicreticulum (ER)(RER)
Description FunctionsNetwork of tubes or
membranesSmooth w/o ribosomesRough with embedded
ribosomesConnects to nuclear
envelope & cell membrane
Carries materials through cell
Aids in making proteins
Endoplasmicreticulum(SER)
Description FunctionsNetwork of tubes or
membranesConnects to nuclear
envelope & cell membrane
Protein and lipid synthesis.
Detoxifying drugs and poison.
RibosomesDescription Function
Small bodies free or attached to RER
Made of RNA & protein
Synthesizes proteins
Mitochondria Description Function
Peanut shaped Double membraneOuter membrane smoothInner membrane folded
into cristaeKnown as Power house
of cell.
Breaks down sugar (glucose) molecules to release energy as ATP(Adenosine Triphorpate)
Site of aerobic cellular respiration
VacuoleDescription Function
Fluid-filled sacsLargest organelle in
plant cells
Store food, water, metabolic & toxic wastes
Store large amounts of food or sugars in plants
LysosomeDescription Function
Small and round with a single membrane
Breaks down larger food molecules into smaller molecules
Digests old cell parts
ChloroplastDescription Function
Green, oval containing chlorophyll (green pigment)
Double membrane with inner membrane modified into sacs called thylakoids
Stacks of thylakoids called grana & interconnected
Gel like innermost substance called stroma
Uses energy from sun to make food (glucose) for the plant
Process called photosynthesis
Release oxygen
NucleolusDescription Function
Found inside the cell's nucleus
May have more than oneDisappear during cell
division
Make ribosomes
Golgi ApparatusDescription Function
Stacks of flattened sacs Have a cis & trans faceModify proteins made by
the cellsPackage & export
proteins
Made by :- Harsh maheshwari
Class :- Ninth ‘A’
Roll no. :- 9
Subject :- Science