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Transcript
Name: ____________________________________ Date: ______________________ What is a Cell? Worksheet The invention of the microscope made many important discoveries possible. One of these discoveries was made by Robert Hooke in 1665. Hooke, an English scientist, discovered that living things are made up of tiny living parts. He called these parts cells. Living things that can be seen only with a microscope are called microscopic organisms. Some microscopic organisms, like bacteria and protozoa, have only one cell. Large plants and animals contain billions of cells. All of the life functions take place in every cell. The cell itself is made of certain parts. Plant and animal cells are not exactly alike. But three cell parts that are found in both plant and animal cells are: the cell membrane, the cytoplasm, and the nucleus. These are all living materials. Living cell material is called protoplasm. CELL MEMBRANE – The cell membrane is like a very thing skin covering the cell. It protects the cell and helps to give it a shape. There are very tiny holes in the cell membrane. Materials enter and leave the cell through these openings. CYTOPLASM – The cytoplasm is jelly-like. It fills most of the inside of the cell. Like the cell membrane, it helps give the cell its shape. Most of the life functions take place here – in the cytoplasm. NUCLEUS – The nucleus is inside the cell, surrounded by the cytoplasm. The nucleus is like the boss of the cell. It controls everything that happens in the cell. Label the Parts The picture to the right shows an animal cell. These are the parts of this cell: nucleus, cell membrane, cytoplasm. Find each part of the cell in the picture. Write its name on the correct line in the picture. Name: ____________________________________ Date: ______________________ What Do the Pictures Show? Look at each picture. Then answer the questions. 1. Name a cell part that has tiny holes in it. _______________________________________ 2. What needed materials enter through the holes? _______________________________________ 3. What unwanted materials leave through the holes? _______________________________________ 4. Which is larger, a cell or an atom? ________________________________ 5. Which is alive, a cell or an atom? ________________________________ Most cells have only one nucleus. Muscle cells have more than one nucleus. 6. Is this a muscle cell? ______________________________________________ 7. How do you know? ______________________________________________ ______________________________________________ A bird’s egg is a single cell. A bird’s egg has a hard shell that covers the membrane. 8. Do you need a microscope to see this cell? ______________________________________________ 9. What extra part does a bird’s egg have? ______________________________________________ Name: ____________________________________ Date: ______________________ True of False Write T on the line next the number if the sentence is true. Write F is the sentence is false. 1. ________ A rock has cells. 2. ________ Most of the cell is the nucleus 3. ________ Only the nucleus of the cell is its protoplasm 4. ________ The cell membrane has holes 5. ________ Most cells are microscopic in size 6. ________ Plant cells and animal cells are exactly alike 7. ________ A cell must have a nucleus to live 8. ________ Every cell has a cytoplasm 9. ________ Most of the life functions take place in the nucleus 10. ________ A cell produces waste products Matching Match the two lists. Write the correct letter on the line next to each number. 1. ________ waste products (a) the boss of the cell 2. ________ atoms (b) have more than one nucleus 3. ________ nucleus (c) go out through the cell membrane 4. ________ muscle cells (d) not living Completing Sentences Complete the sentences with the words below. One word can be used twice. microscopic egg atom life functions cell membrane cytoplasm nucleus waste products muscle cells living microscopic organisms 1. The ____________________ take place in the cell. 2. An ____________________ is much smaller than any part of a cell. 3. Cells are ____________________ things. 4. The instrument used to see tiny objects is called a ____________________. 5. The ____________________ is a boss of the cell. 6. ____________________ have more than one nucleus. 7. An ____________________ is a cell that can be seen without a microscope. 8. The ____________________, ____________________, and ____________________ are parts of the cell. 9. Living things that can be seen only with a microscope are called ____________________. 10. ____________________ leave through the cell membrane.