cells

11
Cells The building blocks of life

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For IGCSE O-Level Biology students Chapter 2

TRANSCRIPT

Page 1: Cells

CellsThe building blocks of

life

Page 2: Cells

Animal and plant cellsAnimal cell Plant cell

Cell membrane

nucleus

cytoplasm

Cell wallcytoplasmSap vacuole

chloroplast

Nucleus

Cell membrane

Page 3: Cells

Cell structuresAnimal cell

Plant cell

Comment

Cell membrane

Cytoplasm

Nucleus

Cell wall

Chloroplast

Sap Vacuole

present

present

present

present

present

present

present

present

absent

A membrane that holds the cell contents together, can

control what goes in and out of the cell

absent

Jelly-like substance where all chemical reactions take placeControls the cell activities, contains the DNA

A rigid substance made of cellulose that keeps the cell’s shape fixedContains chlorophyll,

can carryout photosynthesis

A place where the cell may store food or wastes

absent

present

Page 4: Cells

Pictures of different cells:

Page 5: Cells
Page 6: Cells

Name of cell Red blood cells

Cell’s function To transport oxygen from lungs to all body cells

Features present in cell that help it to carry out its function

1. Contain haemoglobin : that carries oxygen

2. Have no nucleus : to make more space for haemoglobin

3. Have biconcave shape : to increase surface area for absorption of oxygen

Drawing

Side view Top view

Page 7: Cells

Name of cell Muscle cells

Cell’s function To move part of the body

Features present in cell that help it to carry out its function

Have contractile fibers that can shorten to produce movement

Drawing

Page 8: Cells

Name of cell Ciliated cells

Cell’s function To sweep away dust and bacteria in air

Features present in cell that help it to carry out its function

1. Have short hairs (cilia) that move to sweep mucus out of the respiratory tract

Drawing

Page 9: Cells

Name of cell Palisade cells

Cell’s function To change light energy to chemical energy (food)

Features present in cell that help it to carry out its function

1. Have chloroplasts containing green chlorophyll that can carry out photosynthesis

Drawing

Page 10: Cells

Name of cell Xylem cells

Cell’s function Transport water and minerals up the plant

Features present in cell that help it to carry out its function

1. Have no cell contents 2. Have no end walls to create long

hollow tubes3. Walls are lined with a tough

substance called lignin

Drawing

Page 11: Cells

Name of cell Root hair cells

Cell’s function Absorb water and minerals from the soil

Features present in cell that help it to carry out its function

1. Has a long protrusion to increase the surface area of absorption.

Drawing