science

Topics: Cell, Blood, Cell wall Pages: 6 (2061 words) Published: November 1, 2014

Science Revision
Half-Yearly's
Name the lenses found in a microscope.
Eyepiece or ocular lens
Objective lens
Recall the units used to measure microscopic objects.
Micrometres
Recall what happens to the field of view as the magnification used increases. As the magnification increases, then the amount of the specimen you can see (the field of view) gets smaller. Name two different types of:

Light microscope- monocular microscope and the binocular microscope. Electron microscope- transmission electron microscopes and scanning electron microscopes. Name the parts of animal cells that:
controls the movement of materials into and out of the cell- cell membrane controls all chemical reactions within the cell- nucleus
is a watery jelly-like liquid- cytoplasm
Name the parts of plant cells that:
that controls the movement of materials into and out of the cell- cell membrane in which photosynthesis takes place- chloroplasts
that forms the skeleton of the plant- cell wall
Name the process in which plants manufacture their food.
Photosynthesis
List three specialised cell types found in plants. Explain
Guard cells- are found on the leaves and stems of plants. Guard cells work in pairs to open and close very tiny pores (or holes) in the leaves called stomata. Conducting cells- transport food and water from the leaves to the roots and stems. Photosynthetic cells- cells used for the process of photosynthesis. Chloroplasts contain a chemical known as chlorophyll. List three types of specialised cell types found in animals. Explain Nerve cells- carry information from your brain to other parts of your body. Blood cells- red blood cells carry oxygen from your lungs around your body to the cells where it is used to release the energy you need. White blood cells are part of the immune system and help the body to fight infection. Fat cells- brown fat cells are used to produce the heat for the body. The white fat cells are used as a store of energy, they also form an insulating layer under the skin that helps to keep your body at a constant temperature. State which has more different types of cells: plants or animals? Plants

State what the following prefixes mean.
uni as the prefix of unicellular- one or single
multi as the prefix or multicellular- many or more than one. Name the following types of cells:
leaf cells where the plant's food is made- Photosynthetic cells animal cells that send electrical messages around the body- Nerve cells animal cells that help fight infection- White blood cells
cells that control the gases going into and leaving a leaf- guard cells What is a tissue?
Cells that perform the same function are not scattered throughout the body; they are grouped together to form tissues. What is an organ?
An organ is a structure that contains at least two different types of tissue that work together to complete a task. What is an organ system?
Organ systems have two or more organs that work together.
What are the four types of tissue? Explain.
Epithelium- another name for skin. It lines the inside of your mouth right down to your stomach and through the rest of your insides, it also covers all the organs of the body. Connective tissue- adds support and structure to the body. Examples of connective tissue are fat, bone, cartilage, ligament and tendon. Muscle tissue- is a specialised tissue that can contract, becoming shorter and fatter. Nerve tissue- can send electrical signals around the body. These are managed by nerve tissue in the brain and passed down the spinal cord to the body. What is the largest organ of your body?

The skin, because of its many different parts.
What are the different systems in the body? Explain
Respiratory system- which gets oxygen from the air into your body and gets rid of waste carbon dioxide. Skeletal system- which is your skeleton and muscles.
Digestive system- makes food available in a form the body can use. Circulatory system- carries the food and oxygen to the cells...
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