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Photosynthesis Respiration.

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Presentation on theme: "Photosynthesis Respiration."— Presentation transcript:

1 Photosynthesis Respiration

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 the only 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 plants make 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 energy The word photosynthesis comes from 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 turn carbon dioxide and water into food? carbon dioxide water

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 energy carbon dioxide water

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 energy carbon dioxide water

8 Photosynthesis: where it happens
Photosynthesis takes place in plant cells with 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? light energy chlorophyll carbon dioxide water

9 Photosynthesis: products of the reaction
The products of the reaction between carbon dioxide and water are glucose and oxygen. Which of these products is used by plants? What happens to the ‘waste’ product? light energy chlorophyll carbon dioxide oxygen glucose water

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? light energy chlorophyll carbon dioxide oxygen oxygen glucose glucose water

11 Photosynthesis: summary
Summarize the process of photosynthesis in one sentence. Photosynthesis is a chemical reaction that takes place in the chloroplasts in green plant cells, where light energy is used to convert carbon dioxide and water into 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 energy carbon dioxide water glucose oxygen chlorophyll light energy chlorophyll carbon dioxide oxygen glucose water

13 Photosynthesis: word equation activity

14 Word equation to chemical equation

15 Photosynthesis multiple-choice quiz

16 Energy for life Every living cell in your body needs energy. The average adult has about 50 million million cells – that’s a lot of energy! energy Where 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? ? fuel oxygen

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 fuel supplied by the digestive system ? oxygen is supplied by the breathing system How 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 body by 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? respiration glucose energy oxygen Why 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 cells to 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. ? glucose oxygen energy Breathing 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 reaction that takes place in all living cells, in which glucose reacts with oxygen to produce carbon dioxide and water and 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
energy glucose oxygen carbon dioxide water energy carbon dioxide glucose water oxygen

25 Aerobic respiration: word equation activity

26 What is aerobic respiration?
Respiration is the process used by the body’s cells to 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) glucose light energy chlorophyll carbon dioxide water oxygen Respiration (energy released) carbon dioxide glucose oxygen water Compare 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 of oxygen amount of gas in the air amount of carbon dioxide 12 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?


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