2 How do plants get the food they need? All living organisms need food to grow and survive.Plants are known as producers because they provide food for many other organisms.Plants cannot move very much, so how do they get the food that they need?
3 Nutrition in green plants Green plants are amazing because they actually make their own food!Green plants are theonly living organisms that are able to do this.All other organisms rely on plants because of the food that the plants make.What is the name of the process by which plantsmake their own food?
4 What is photosynthesis? Plants make their own food by photosynthesis.This process is a chemical reaction that uses light energy.light energyThe word photosynthesis comesfrom the Greek language:“photo” means “light”“synthesis” means “putting together”Photosynthesis just means “putting together with light”.What do green plants “put together” to make their food?
5 Photosynthesis: raw materials The raw materials for photosynthesis come from the air and the soil.What are these raw materials called?What else do plants need to turncarbon dioxideand water into food?carbondioxidewater
6 Photosynthesis: energy for the reaction Photosynthesis is a chemical reaction between carbon dioxide and water.Energy is needed for this reaction to take place.Where do plants get this energy from?light energycarbondioxidewater
7 Photosynthesis: where it happens Plants use light energy from the Sun to power photosynthesis.Where in the leaf does this reaction take place?Photosynthesis takes place in what part of plant cells?light energycarbondioxidewater
8 Photosynthesis: where it happens Photosynthesis takes place in plant cellswith chloroplasts.Chloroplasts contain the green chemical called chlorophyll.Chlorophyll absorbs the energy from sunlight that allows carbon dioxide and water to react.What are the products of this reaction?lightenergychlorophyllcarbondioxidewater
9 Photosynthesis: products of the reaction The products of the reaction between carbon dioxide and water are glucoseand oxygen.Which of these products is usedby plants?What happens to the ‘waste’ product?lightenergychlorophyllcarbondioxideoxygenglucosewater
10 Photosynthesis: products of the reaction Glucose is the useful product for plants.Some glucose is used straightaway by plant cells, some is converted to starch for storage and later used for food.Oxygen is the ‘waste’ product. This gas is transported out of the leaf into the air.Why is this important for humans and other living things?lightenergychlorophyllcarbondioxideoxygenoxygenglucoseglucosewater
11 Photosynthesis: summary Summarize the process of photosynthesis in one sentence.Photosynthesis is a chemical reactionthat takes place in the chloroplastsin green plant cells, where light energyis used to convert carbon dioxide and waterinto glucose and oxygen.Photosynthesis is a chemical reaction which means it can also be summarized in a word equation.What is the word equation for this vital chemical reaction?
12 Photosynthesis: word equation light energycarbondioxidewaterglucoseoxygenchlorophylllightenergychlorophyllcarbondioxideoxygenglucosewater
16 Energy for lifeEvery living cell in your body needs energy. The average adult has about 50 million million cells – that’s a lot of energy!energyWhere does all this energy come from?In body cells, the energy needed for life comes from the chemical energy stored in glucose. We eat to obtain energy from food (plants).
17 What is needed for releasing energy? Burning is a chemical reaction in which energy is released in the form of heat.What other substance is needed for energy to be released from this fuel??fueloxygen
18 What does the body need for releasing energy? The body’s energy-releasing process depends on the digestive system and the breathing system.What are the substances supplied by these systems?glucose is the fuelsupplied bythe digestive system?oxygenis supplied bythe breathing systemHow does the body’s energy-releasing process compare with releasing energy from wood?
19 Transport around the body Glucose and oxygen enter the body in different ways,Where are these substances needed and how do they get there?but are needed at the same destinations.Glucose and oxygen are transported around the bodyby the circulatory system.Blood flowing in blood vessels takes these important substances to where they are needed – the body’s cells.
20 The body’s energy-releasing process In the body’s cells, the chemical energy stored in glucose is usually released by a chemical reaction with oxygen.What is this energy-releasing process called?respirationglucoseenergyoxygenWhy does every living cell need a constant supply of glucose and oxygen?
21 aerobic = ‘with oxygen’ What is respiration?Respiration is the process used by the body’s cellsto release the chemical energy stored in glucose.When oxygen is involved in this energy-releasing process, it is called aerobic respiration.What do you think aerobic means?aerobic = ‘with oxygen’Aerobic respiration is an efficient process that generates enough energy to supply the whole body.Our bodies perform aerobic respiration most of the time, as long as the supply of oxygen remains high enough.
22 Waste products of aerobic respiration Aerobic respiration releases energy that is useful.This process is a chemical reaction between glucose and oxygen which also generates waste products.?glucoseoxygenenergyBreathing in obtains the oxygen needed for aerobic respiration. How does the body get rid of the waste products?Breathing out removes the waste products of aerobic respiration.How can the waste products of this reaction be identified?
23 Aerobic respiration: summary Summarize the process of aerobic respiration in a sentence.Aerobic respiration is a chemical reactionthat takes place in all living cells,in which glucose reacts with oxygento produce carbon dioxide and waterand stored chemical energy is released.Aerobic respiration is a chemical reaction so it can also be summarized in a word equation.What is the word equation for this vital chemical reaction?
24 Aerobic respiration: word equation energyglucoseoxygencarbondioxidewaterenergycarbondioxideglucosewateroxygen
26 What is aerobic respiration? Respiration is the process used by the body’s cellsto release the chemical energy stored in glucose.When oxygen is involved in this energy-releasing process, it is called aerobic respiration.What do you think aerobic means?aerobic = ‘with oxygen’Aerobic respiration is an efficient process that generates enough energy to supply the whole body.Our bodies perform aerobic respiration most of the time, as long as the supply of oxygen remains high enough.
27 Photosynthesis and respiration Only green plants photosynthesize,but respiration occurs in the cells of all living things to release energy.Photosynthesis(energy needed)glucoselight energychlorophyllcarbondioxidewateroxygenRespiration(energy released)carbondioxideglucoseoxygenwaterCompare the reactants, products and energy results of these two chemical reactions. How are they connected?
28 Photosynthesis and respiration How will the amounts of oxygen and carbon dioxide in the air vary over 24 hours?amount ofoxygenamountof gasin the airamount ofcarbon dioxide12 a.m p.m a.m.What overall effect do photosynthesis and respiration have on the levels of oxygen and carbon dioxide in the air?