- Slides: 22
10/24/2020 Life Processes
Signs of life 10/24/2020 • 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.
10/24/2020 Life Processes All living things have to perform seven life processes. Do you know what they are? Movement Respiration Sensitivity Growth Reproduction Excretion Nutrition Each letter in the phrase ‘MRS GREN’ gives you the first letter of one of the life processes. If something does not perform all of the seven life processes then it is not alive. For something to be classed as Dead it must have been alive once !!
10/24/2020 The 7 Life Processes Movement Respiration Sensitivity Growth Reproduction Excretion Nutrition
10/24/2020 Exercise 1: Animal Movement 1. Why do animals move? To find food, water, shelter, to hide from predators and to reproduce. 2. Copy and complete the table below: Type of movement Example of animal Walking Humans Insect Horse Crawling Running Flying Swimming Jumping Swinging Bird Fish Kangaroo Chimpanzee
Plant Movement 1. Do plants move? • Yes, plants do move, but very slowly compared to most animals. 2. Why do plants move? • Plants move towards sunlight which they need to make food. • Some flowers close during the night. • Roots will move towards water and gravity. 10/24/2020
10/24/2020 Respiration • Respiration is the process by which energy is released from our food. • This energy is used for the organism to perform the other life processes. • Most of our food is digested down to glucose. • This joins with oxygen to release the energy and gives off the waste products carbon dioxide and water. Glucose + Oxygen ENERGY + Carbon dioxide + Water
10/24/2020 Match the word to its correct meaning: 1 respiration 2 oxygen 3 carbon dioxide 4 water D A B C A C D E is needed to release energy from glucose in take materials to and from respiring cells. the body. is needed to release energy from glucose in is a poisonous by-product of respiration. the body. the process that releases energy from food. is made when energy is released from food. 5 energy E F is made when energy is released from food. is needed to do the rest of MRS GREN. 6 transport systems F B is needed to do the rest of MRSGREN. take materials to and from respiring cells. is a poisonous by-product of respiration. the process that releases energy from food.
10/24/2020 Exercise 2: Respiration 1. Which gas is required for respiration? Oxygen. 2. What are the waste products of respiration? Water and Carbon dioxide. 3. Write a word equation for the process of respiration. Food + Oxygen Energy + Carbon dioxide + Water 4. What is the chemical test for carbon dioxide gas? It turns limewater milky (and then clear again).
10/24/2020 True or false? 1. Respiration means breathing. FALSE 2. Respiration occurs in all body cells. TRUE 3. Respiration gives out oxygen. FALSE 4. Carbon dioxide is used up by respiration. FALSE 5. Respiration is a chemical process that releases energy. TRUE 6. Plants do not respire. FALSE
move reproduce respiration sensitivity nutrition excreted 10/24/2020 grow Living things ______ to produce offspring. Animals also _____ to catch food, to find a mate and also to escape any predators. As we get older, we ______ to reach our full size. We use energy to do different things. Releasing energy from food is called ______ and eating the food we require is called _____. Any waste produced is ____ from our bodies. Living things must also react to what happens to them. This is called _____.
10/24/2020 Sensitivity is the ability of living things to detect changes in their surroundings and respond to these changes. Humans have five senses; do you know what they are? Touch Taste Smell Sight Hearing Skin Tongue Nose Eyes Ears Which organs are associated with these senses?
10/24/2020 Exercise 3: Sensitivity 1. What is sensitivity? Being able to detect and respond to your surroundings. 2. Complete the table below: Sense Sight Hearing Body part Eye Ear Taste Tongue Smell Nose Touch Skin 3. Name two animals that can hear ultrasound. Dogs and bats.
10/24/2020 Growth Animals grow until they reach adulthood and then stop growing. Plants continue to grow throughout their lives.
10/24/2020 Animal Reproduction All organisms need to reproduce. Reproduction is the making of new organisms. If organisms did not reproduce, then once those organisms died there would be no more of the species left. Some animals reproduce by laying eggs. Example: Birds Some animals reproduce by giving birth to live young. Example: Mammals suckle their young - the females provide milk for their offspring. Adult and young kangaroo
10/24/2020 Exercise 5: Link the Matching Pairs Acorn Lion Cub Seal Calf Oak tree Baby Human Pup Whale
10/24/2020 Plant Reproduction Some plants reproduce using the wind to carry pollen from one flower to another. Some plants reproduce using insects or birds to carry pollen from one flower to another. Why are insects attracted to flowers? They are attracted by scent, colour and nectar.
Excretion is the process where an organism gets rid of waste products that would otherwise cause it harm. Breathe through a tube into a beaker of limewater. What do you observe? What happened to the limewater? What does this tell you? It went milky. There is more carbon dioxide in the air we breathe out than the air we breathe in. Carbon dioxide is a waste product of respiration. What is the other waste product? HINT! Breathe on a mirror. The waste products of respiration are carbon dioxide and water. 10/24/2020
10/24/2020 Exercise 6: Removing Waste 1. What do we call the process that remove waste products from an organism? Excretion. 2. What are the waste products of respiration? Water and carbon dioxide. 3. How do we remove carbon dioxide from our body? We breathe it out. 4. What would happen if we did not remove this carbon dioxide? It would poison our bodies and eventually kill us.
10/24/2020 Nutrition is the obtaining of food to keep an organism healthy. Animals eat food. Some animals eat other animals. What do we call these types of animals? CARNIVORES. Some animals eat plants What do we call these animals? HERBIVORES. Animals that eat plants and animals are called OMNIVORES. A carnivore Green plants make their own food using sunlight, water and carbon dioxide. This process is called PHOTOSYNTHESIS.
10/24/2020 Exercise 7: Link the Word with the Description Carnivore Omnivore Plant-eating animals Meat-eating animals Photosynthesis The gas needed by green plants to make food Carbon dioxide Animals that eat meat and plants Herbivore The process by which green plants make food using sunlight
10/24/2020 Exercise 8: Insert the Key Words Animals must eat food to gain nutrition. Animals that eat plants are called _____. Animals that eat herbivores ____ are called carnivores. Animals that eat meat and plants are called _____. omnivores Green plants gain nutrition by making their own food using _______, water and oxygen. This process is sunlight photosynthesis called _______. meat omnivores photosynthesis herbivores sunlight