7a Cells Ws

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Cells W Richards Worthing High School

Please note – some of the animation effects used here only work in PP XP

Using a microscope

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1. Eyepiece

2. Arm 7. Lenses 6. Stage 5. Mirror

3. Focus adjustor 4. Base

Plant cells vs. Animal cells

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Both types of cell have these:

1) Cytoplasm this is where the reactions happen 2) Nucleus – The “brain” of the cell 3) Cell Membrane – holds the cell together

Only plant cells have these: 4) Cell wall – provides support

5) Chloroplasts – contain chlorophyll 6) Large Vacuole – contains sap

Specialised cells Consider the root hair cell: It is “suited” to its job of taking in water and nutrients in 2 ways: 2) It has a large surface area 3) It has a thin cell membrane

The sperm cell is another example of a specialised cell:

Strong tail for swimming

Vacuole containing enzymes

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More specialised animal cells

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I.D:

Red Blood Cell

Function:

Carries oxygen around the body

Features:

No nucleus and large surface area

Ciliated epithelial cell

White blood cell

Nerve cell (neurone) Egg cell (ovum)

Cells, tissues, organs and systems

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Basically, all living things are made up of cells… A group of CELLS makes up a TISSUE A group of TISSUES makes up an ORGAN A group of ORGANS makes up a SYSTEM A group of SYSTEMS make up an ORGANISM

Another example

Here’s another example in humans: Muscle cells Muscle tissue Organ System

Organism

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Cell growth Animal cells:

Plant cells:

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Plant reproduction

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For a plant to reproduce two stages must happen: Stage 1: Pollination – pollen from one plant is taken to another by insects or the wind:

Plant reproduction

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Stage 2: Fertilisation – a pollen tube grows down through the style and the pollen grain (which contains the male sex cell) travels down the tube to fertilise the female egg cell:

Ovaries