Chapter+1+Life

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=Cells= =Cell games=

Living things are made of cells.
 * **Animal cells** :

|| **Plant cells** ||

Nucleus contains DNA(Deoxy- ribonucleic acid), the instructions that control the cell. Cell membrane controls what enters and leave the cell. Helps keep shape. Cytoplasm where the cells chemical reactions occur. || Different: Cell wall support the cell and plant. Made of cellulose. Vacuole contains cell sap. Some waste materials is stored here. Chloroplasts contain the pigment chlorophyll. This absorbs energy from the sun to allow plants to make food. (PHOTOSYNTHESIS) || Remember;All living things are made up of __cells__. Plant and animal cells have a __cell membrane__, __nucleus and cytoplasm__. Plant cells also have a __cell wall__ and a __vacuole__. Cells are controlled by the __nucleus__, chemical reaction, which keep the cell alive, take place in the cytoplasm.
 * Parts of a cell are called ORGANELLES.


 * ====Cells, Tissues and organs ====

Not every cell is the same. Cells have a specialised structure depending on their job.

|| ====Continuing Cells, Tissues and organs====

||

A TISSUE is a group of similar cells that have a similar function. Cells in a tissue have similar functions. Animal and Plant Tissues Bone - To give support Nervous Tissue - To carry messages Muscles - To help us move Xylem - To carry water and minerals from working together

An organ is a group of tissues working together.

Growth is an increase in the size or number of cells. Cells increase in the number by dividing. First, the nucleus divides into two then the cell divides. In animals normal cell division is called MITOSIS. Cells do not __live__ forever. They make __copies__ of themselves and die. All cells have a nucleus except re __blood__ cells. The __nucleus__ controls the cell and __decides__ when it should __divide__ and when it should __die__.
 * Cell division**

Amazing animals in the womb

Click and Clone


 * Uncontrolled cell division**
 * Remember**
 * __Cancer__ is treated by killing and __removing__ the cells that are dividing in an __uncontrolled__ way. The __treatment__ is very difficult and sometimes is not __successful__. A great deal of medical __research__ is looking for a __cure__ for cancer but we still haven't yet found one simple cure for all cancers.**


 * Kiwi and DNA**

Organs in the body [|Life fantastic video] from Royal Institution media type="file" key="The Cell High School Biology.mp4" [|The Cell] by [|Nucleus Medical Media] from youtube.com Tropism //LOs: To identify conditions affecting plant growth // //To define tropism and to describe types of tropism //

media type="youtube" key="F3Oj2er-91s" width="420" height="315" Tropism: Directional growth response •Plants grow in a certain direction in __response__ to a __stimulus__

•Positive tropism is when __the plant grows towards the stimulus__

•Negative tropism is when __the plant grows away from the stimulus__ Plants respond to stimuli to:

•avoid __stress__ and __being eaten__

•enhance __survival__

•improve chances of __having of offspring__

The way a plant grows is controlled by the __hormones__

These are sensitive to the environment and can make adjustments to help plant__survive__ **Thigomotropism**

media type="youtube" key="O7eQKSf0LmY" width="392" height="1.5; height: 219" media type="youtube" key="dTljaIVseTc" width="399" height="291"