© OUP: To be used solely in purchasers school or college 7A Cells Signs of life Building blocks...

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Transcript of © OUP: To be used solely in purchasers school or college 7A Cells Signs of life Building blocks...

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OUP: To be used solely in purchasers school or college 7A Cells Signs of life Building blocks of life Building living things 7A Cells Slide 2 OUP: To be used solely in purchasers school or college Signs of life 7A Cells Slide 3 OUP: To be used solely in purchasers school or college 7A Signs of life - Life on Mars? Slide 4 OUP: To be used solely in purchasers school or college Serious efforts to discover life on other planets have been going on for many years. If extra-terrestrial beings really were discovered how would scientists decide if they were alive? A simple way of sorting everything on our planet is to divide it into 2 groups living things and non-living things. But can you tell the difference? 7A Signs of life - Life on Mars? Slide 5 OUP: To be used solely in purchasers school or college 7A Signs of life - Staying alive Slide 6 OUP: To be used solely in purchasers school or college There are seven essential life processes. To remember these processes meet our little blue woman MS. R. NERG What do all the letters in her name stand for? 7A Signs of life The meaning of life Slide 7 OUP: To be used solely in purchasers school or college 7A Signs of life - The meaning of life S = SENSITIVITY Living things notice and react to changes in their surroundings. They can respond to light, heat, sound, taste, sight or touch. R = RESPIRATION Living things need energy to carry out the functions that keep them alive. Respiration is the process by which food is turned into energy. M = MOVEMENT Living things are able to move about. Animals move from place to place. Plants move by responding to light. Slide 8 OUP: To be used solely in purchasers school or college 7A Signs of life - The meaning of life R = REPRODUCTION Living things produce offspring. Reproduction continues the survival of each species. G = GROWTH Living things grow, increasing in size and complexity. N = NUTRITION Living things need to take in food so that respiration can occur. Nutrients in food help to build, maintain and repair the organism. E = EXCRETION Living things have to get rid of unwanted waste products. Slide 9 OUP: To be used solely in purchasers school or college All living things carry out the seven essential life processes. But what are living things made of? 7A Signs of life - The meaning of life MSRNERGMSRNERG = Movement = Sensitivity = Respiration = Nutrition = Excretion = Reproduction = Growth Slide 10 OUP: To be used solely in purchasers school or college 7A Cells Building blocks of life Slide 11 OUP: To be used solely in purchasers school or college 7A Building blocks of life - Cell fact file Living things are made up of tiny building blocks called cells. Each cell breathes, takes in food, gets rid of wastes, grows, reproduces and dies. A living thing can be just one cell or millions of cells. Big living things dont have bigger cells they just have more cells. Slide 12 OUP: To be used solely in purchasers school or college 7A Building blocks of life - Cell fact file Amazingly, the human body has more than 10,000,000,000,000 (thats 10 million million) cells! How do we know about cells if they are so small? Think about the size of your little toe. It has about 2 or 3 thousand million cells! Thats a lot of cells to make one toe, so cells must be very, very, very small. Slide 13 OUP: To be used solely in purchasers school or college 7A Building blocks of life - Cell-ebrate the Microscope Cells could not have been discovered without the invention of the microscope. micro- means small, -scope means looking at. A microscope allows us to look at very small things by making them seem bigger. It magnifies tiny details and makes them visible to the human eye. Slide 14 OUP: To be used solely in purchasers school or college Cell-ebrate the microscope! 7A Building blocks of life - Cell-ebrate the Microscope Slide 15 OUP: To be used solely in purchasers school or college 7A Building blocks of life - Cell-ebrate the microscope Every living thing from an elephant to an ant, from a tree to a daisy, from your left toe to right earlobe is made of cells. Microscopes allow us to magnify cells revealing their shape and structure. Do animal and plant cells look the same? This is a typical animal cell. Slide 16 OUP: To be used solely in purchasers school or college 7A Building blocks of life - Typical animal cell Slide 17 OUP: To be used solely in purchasers school or college 7A Building blocks of life - Typical plant cell Slide 18 OUP: To be used solely in purchasers school or college Which parts of a plant cell are the same as an animal cell? Which parts of a plant cell are not found in an animal cell? 7A Building blocks of life - Typical cells Compare a typical animal cell and a typical plant cell. Slide 19 OUP: To be used solely in purchasers school or college 7A Cells Building living things Slide 20 OUP: To be used solely in purchasers school or college 7A Building living things - Cells working together What could you do if you were one cell? Keeping you alive is a big job. So your body is made of millions of cells that have to be very organised. Your body has organs that each carry out specific jobs to keep you alive. How many organs can you name? Not much! Youd be a blob, with lots of pieces floating around inside of you! Slide 21 OUP: To be used solely in purchasers school or college 7A Building living things - Cells, tissues and organs Identify the organs labelled in the diagram. brain skin eye ear tongue heart lung stomach muscle intestines Slide 22 OUP: To be used solely in purchasers school or college 7A Building living things - Cells, tissues and organs Cells are the building blocks of all living organisms. Different cells do different jobs. How do the millions of cells in your body work together? muscle cell Similar cells that do the same job work together to make tissue. Muscle cells make muscle tissue. What type of cells are nerve tissue and blood tissue made from? muscle tissue Different tissues work together to make an organ. Muscle tissue, nerve tissue and blood tissue make up the stomach. Organs work together to make an organ system. What organ system is the stomach part of? stomach Slide 23 OUP: To be used solely in purchasers school or college 7A Building living things - Different cells for different jobs Name a cell that would be suitable for each job. Slide 24 OUP: To be used solely in purchasers school or college 7A Building living things - How are new cells made? All living things (including you and your teacher) started as one tiny cell! So where do all the cells come from? Living things grow and repair themselves by an amazing process called cell division. Slide 25 OUP: To be used solely in purchasers school or college 7A Building living things - How are new cells made?