Cells structureand function

QuizCell size

My name is Okoro the My name is Okoro the nucleus and I will be one ofnucleus and I will be one ofyour guides during this topic.your guides during this topic.

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ObjectiveObjective

To learn about plant and animal cells and functionTo learn about plant and animal cells and function

OutcomeOutcome

At the end of this session, pupils should be able to understand: At the end of this session, pupils should be able to understand:

cell sizescell sizescell structure and functionscell structure and functions

the differences between plant and animal cellsthe differences between plant and animal cellsthe importance of microscope in cell viewthe importance of microscope in cell view

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Introduction

Cells are the basic functional unit of life. Some of them Cells are the basic functional unit of life. Some of them exist independently. Two-thirds of a cell is water, whichexist independently. Two-thirds of a cell is water, whichmeans that 2/3 of your whole body is water.means that 2/3 of your whole body is water.

The rest is a mixture of molecules, mainly proteins, fatsThe rest is a mixture of molecules, mainly proteins, fatsand carbohydrates.and carbohydrates.

Your body is constantly replacing old cells with new Your body is constantly replacing old cells with new ones at the rate of millions per second.ones at the rate of millions per second.

Cells are too small to be seen with the naked eye Cells are too small to be seen with the naked eye without a microscope. without a microscope.

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How big are cells? To help you understand their size try putting these six objects in order with the largest first.

Plant cellPlant cell

nucleusnucleus

Animal cellAnimal cell virusvirus

antantchloroplastchloroplast(part of a plant cell)(part of a plant cell)

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How big are cells?

1 ant will fit on this pinhead

60plantcells

100animalcells

manymore nuclei

evenmorechloroplasts

Virusesare evensmaller

LargestLargest SmallestSmallest

Lets take a microscopic look at one of the cells in the ant. These are called animal cells.

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Hundreds of animal cells with irregular shapes. Lets take a look at just one animal cell.

cell membranecell membrane

cytoplasmcytoplasm

nucleusnucleus

Lets take a closer look at one of the cells in the leaf.These are called plant cells.

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Hundreds of plant cells with regular shapes. Lets take a look at just one plant cell.

cell membranecell membrane

cytoplasmcytoplasm

nucleusnucleus

cell wallcell wall

vacuolevacuole

chloroplastchloroplast

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Copy and complete these cells

cytoplasm

nucleus

cell membrane

cell wall

chloroplast

vacuoleAnimal cell Plant cell

1

2

3

4

5

6

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Copy and complete these cells

cytoplasm

nucleus

cell membrane

cell wall

chloroplast

vacuoleAnimal cell Plant cell

lets substancesinto and out of the cell

strong surface which keeps the cell in shape

controls what goes on in the cell

contains chlorophyllfor photosynthesis

The vacuole removes The vacuole removes substances that might substances that might be harmful to the cell be harmful to the cell and maintains an and maintains an

acidic internal pHacidic internal pH..

The chemical reactions The chemical reactions Which keep the cell aliveWhich keep the cell alivetake place in cytoplasmtake place in cytoplasm

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Teachersinstructions

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A B C D

E F G H

1. A rigid regular structure with strong walls tomaintain its shape

cytoplasm cell wallcell

membraneanimal

cell

chloroplast nucleusplant cellvacuole

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A B C D

E F G H

2. The control centre of any cell

chloroplast cytoplasm cell wall vacuole

nucleuscell

membrane plant cellanimal

cell

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A B C D

E F G H

3 Small part of a cell which is needed forphotosynthesis

chloroplast cytoplasm cell wall vacuole

nucleuscell

membrane plant cellanimal

cell

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A B C D

E F G H

4 Substances get in and out of the cell by passing through it.

chloroplast cytoplasm cell wall vacuole

nucleuscell

membrane plant cellanimal

cell

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A B C D

E F G H

5 The part that gives the cell a regular shape

chloroplast cytoplasm cell wall vacuole

nucleuscell

membrane plant cellanimal

cell

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A B C D

E F G H

6 A changing space which keeps a plant cell in shape

chloroplast cytoplasm cell wall vacuole

nucleuscell

membrane plant cellanimal

cell

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That’s all for now.That’s all for now. Any questions?Any questions?

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Membranes allow things in and out of the cells

Substancesenter

Substances enter

and leave the cell

and leave the cell

I’m incharge!!!

The nucleus controls what goes on in the cell

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Chloroplasts are found in plant cells.

Chloroplasts absorblight and make food.

What is the name of this process?

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Instructions for the QuizInstructions for the QuizThe idea of this series of six questions is that they can be used as a The idea of this series of six questions is that they can be used as a plenary at the end of each section of the work on cells. The question is plenary at the end of each section of the work on cells. The question is asked and the answers appear. After the answers have finished movingasked and the answers appear. After the answers have finished movingthey will eventually come to rest in the eight boxes which are labelledthey will eventually come to rest in the eight boxes which are labelledA-H. The winner is the first pupil to identify the correct letter eachA-H. The winner is the first pupil to identify the correct letter eachtime. The winner can be determined in a number of ways.time. The winner can be determined in a number of ways.1.1. The first person to shout out the correct letter.The first person to shout out the correct letter.2.2. The first person to put their hand up and give the correct answer.The first person to put their hand up and give the correct answer.3.3. The first person to hold up the correct letter from their cards.The first person to hold up the correct letter from their cards.With this third option pupils could be given a printed copy of the work With this third option pupils could be given a printed copy of the work sheet which they can cut up before spreading the eight letters in front sheet which they can cut up before spreading the eight letters in front of them on the desk. of them on the desk.

worksheetworksheet

The final way you could play the game just uses two sets of letters. The final way you could play the game just uses two sets of letters. Two pupils are chosen to play with the winner staying on and the loserTwo pupils are chosen to play with the winner staying on and the loserpasses their cards on to the next pupil who becomes the new challenger.passes their cards on to the next pupil who becomes the new challenger.The winner is the pupil who wins the final question.The winner is the pupil who wins the final question.

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AA BB CC DD

EE FF GG HH