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Biology (Cells (What are cells? (Parts of a microscope (There is an…
Biology
Cells
What are cells?
Cells are the building blocks of life and they are really small. They perform certain functions. We can make observations with cells. An observation is looking at something with detail
Parts of a microscope
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There is an objective lens that can be adjusted as it goes 10×, 4× and 40×.
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Animal and plant cells
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Plant Cells Also Have
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Chloroplasts that perform photosynthesis as it traps the suns energy on the chlorphyll. Chloro is greek for green
Specialised Cells
Specialised cells are cells that have adapted their structure to perform a certain job. For example, red blood cells have no nucleus and they have a disc like shape so they can carry as much oxygen as possible. Palisade cells have chloroplasts as they are on the top of leaves and they can carry out photosynthesis.
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Unicellular organsims
Unicellular organisms are living things that are made up of only one cell. Amoeba and euglena are both types of unicellular organisms. Amoeba reproduce by a method called binary fission. First the nucleus divides into 2 then the cytoplasm divides into 2 with each bit with a nucleus. Euglena have flagella that can help them move as it acts like a propeller.
Levels of organisation
Level of organisation
Multicellular organisms are living things made up of loads of cells. The first level of organisation is a tissue. A tissue is a group of similar cells working together to perform a specific function. The second level of organisation is an organ. An organ is a group of different tissues working together to perform a certain function. The third level of organisation is an organ system. An organ system is a group of different organs working together to perform a certain function. The final level of organisation is an organism. An organism is a group of organ systems that are needed to live and survive.
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