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Cells

Revision for the Year 7 Cells test

QuestionAnswer
What are the seven life functions? (Mrs Gren) Movement, respiration, sensitivity, growth, reproduction, excretion, nutrition.
What is a cell? A cell is the smallest unit of life.
What is a unicellular organism? A unicellular organism is an organism that is made up of just one cell.
Give an example of a unicellular organism. Amoeba and Euglena are unicellular organisms.
Can you name parts of amoeba? Amoeba has a nucleus, contractile vacuole, cell membrane, food vacuoles and pseudopods.
Name parts of Euglena. Euglena has a flagellum, nucleus, chloroplasts, a contractile vacuole and an eye spot.
Name some differences between Amoeba and Euglena. Amoeba has pseudopods and Euglena has a flagellum and chloroplasts.
What is a multicellular organism? This is an organism made of many types of cell.
What advantages are there to being multicellular? Multicellular organisms can be bigger and more complex.
How are cells organised in the body. Cells are organised into tissues which are organised into organs, which then belong to organ systems. Organ systems are then organised into an organism.
What is an organism? An organism is a living thing.
What is a microscope used for? To magnify .
Name some differences between onion and cheek cells. Onion cells have a more regular shape. Cheek cells are more irregular.
What similarities are there between plant and animal cells? Plant and animal cells both have a nucleus, mitochondria, a cell membrane and cytoplasm.
What are the differences between plant and animal cells? Plant cells have a rigid cell wall, a vacuole and chloroplasts.
What is meant by the term 'specialised cell'? A specialised cell is one that is adapted for a specific function.
What does 'adapted to function' mean? Adapted to function means having special features to do a job really well.
What are 'structural adaptations'? Structural adaptations are special features that help a cell carry out its functions.
Name some specialised cells. Some examples of specialised cells are: red blood cells, nerve cells, muscle cells, root hair cells, palisade cells.
What is the function of the digestive system. The function of the digestive system is to break down and absorb food molecules.
What does the urinary system do? The urinary system eliminates waste from the body.
What is the function of the circulatory system? The function of the circulatory system is to transport substances around the body.
What does the respiratory system do? The respiratory system replaces oxygen and removes carbon dioxide from the blood.
What substances do the circulatory system transport around the body> The circulatory system transports oxygen from the lungs and glucose from the intestine.
Name some organs that are protected by the rib cage. Heart and lungs are protected by the rib cage.
What are drugs? Drugs are substances that affect the way the body works.
What does a nucleus do? A nucleus controls the cell's activities.
What does the immune system do? The immune system protects the body against infections.
What does the vacuole do in a plant cell? A vacuole contains liquid to store substances in and it helps keep the cell rigid.
What is the function of the cell wall? The cell wall helps keep the cell rigid.
What would happen to an organ if the blood supply to it was cut off? An organ without a blood supply would not work because an organ needs oxygen to work.